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CVE-2026-1527

undici is vulnerable to CRLF Injection via upgrade option

4.6 MediumFix available

ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:

  • Inject arbitrary HTTP headers
  • Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch) The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters:

// lib/dispatcher/client-h1.js:1121 if (upgrade) { header += connection: upgrade\r\nupgrade: ${upgrade}\r\n }

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.32%Up 0.3 points since Mar 13, 2026
90%50%10%1%

What each source reports

CVE List Score used 4.6

undici is vulnerable to CRLF Injection via upgrade option

ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:

  • Inject arbitrary HTTP headers
  • Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch) The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters:

// lib/dispatcher/client-h1.js:1121 if (upgrade) { header += connection: upgrade\r\nupgrade: ${upgrade}\r\n }

Record
CVE-2026-1527
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-93
Updated
2026-11-02
EUVDEUVD-2026-11701 4.6

ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:

  • Inject arbitrary HTTP headers
  • Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch) The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters:

// lib/dispatcher/client-h1.js:1121 if (upgrade) { header += connection: upgrade\r\nupgrade: ${upgrade}\r\n }

Record
EUVD-2026-11701
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-4992-7rv2-5pvq 4.6

Undici has CRLF Injection in undici via `upgrade` option

Impact

When an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:

  1. Inject arbitrary HTTP headers
  2. Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch)

The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters:

// lib/dispatcher/client-h1.js:1121
if (upgrade) {
  header += `connection: upgrade\r\nupgrade: ${upgrade}\r\n`
}

Patches

Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

Workarounds

Sanitize the upgrade option string before passing to undici:

function sanitizeUpgrade(value) {
  if (/[\r\n]/.test(value)) {
    throw new Error('Invalid upgrade value')
  }
  return value
}

client.request({
  upgrade: sanitizeUpgrade(userInput)
})
Record
GHSA-4992-7rv2-5pvq
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-93
Updated
2026-11-02
NVD 4.6

ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:

  • Inject arbitrary HTTP headers
  • Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch) The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters:

// lib/dispatcher/client-h1.js:1121 if (upgrade) { header += connection: upgrade\r\nupgrade: ${upgrade}\r\n }

Record
CVE-2026-1527
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-93
Updated
2026-11-02
OSVBELL-CVE-2026-1527 4.6
Record
BELL-CVE-2026-1527
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSV 4.6

undici is vulnerable to CRLF Injection via upgrade option

ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:

  • Inject arbitrary HTTP headers
  • Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch) The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters:

// lib/dispatcher/client-h1.js:1121 if (upgrade) { header += connection: upgrade\r\nupgrade: ${upgrade}\r\n }

Record
CVE-2026-1527
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-93
Updated
2026-11-02
Show 19 moreShow less
OSVDEBIAN-CVE-2026-1527 4.6

ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to: * Inject arbitrary HTTP headers * Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch) The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters: // lib/dispatcher/client-h1.js:1121 if (upgrade) { header += connection: upgrade\r\nupgrade: ${upgrade}\r\n }

Record
DEBIAN-CVE-2026-1527
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVGHSA-4992-7rv2-5pvq 4.6

Undici has CRLF Injection in undici via `upgrade` option

Impact

When an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:

  1. Inject arbitrary HTTP headers
  2. Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch)

The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters:

// lib/dispatcher/client-h1.js:1121
if (upgrade) {
  header += `connection: upgrade\r\nupgrade: ${upgrade}\r\n`
}

Patches

Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

Workarounds

Sanitize the upgrade option string before passing to undici:

function sanitizeUpgrade(value) {
  if (/[\r\n]/.test(value)) {
    throw new Error('Invalid upgrade value')
  }
  return value
}

client.request({
  upgrade: sanitizeUpgrade(userInput)
})
Record
GHSA-4992-7rv2-5pvq
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-93
Updated
2026-11-02
OSVRHSA-2026:7350 7.5

Red Hat Security Advisory: nodejs:24 security update

Record
RHSA-2026:7350
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:7670 7.5

Red Hat Security Advisory: nodejs:24 security update

Record
RHSA-2026:7670
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:7675 7.5

Red Hat Security Advisory: nodejs24 security update

Record
RHSA-2026:7675
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRLSA-2026:7350 7.5

Important: nodejs:24 security update

Node.js is a software development platform for building fast and scalable network applications in the JavaScript programming language.

Security Fix(es):

  • nodejs: Nodejs denial of service (CVE-2026-21637)

  • brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion (CVE-2026-25547)

  • minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)

  • undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)

  • undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)

  • undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate decompression (CVE-2026-1526)

  • undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter (CVE-2026-2229)

  • undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers (CVE-2026-1525)

  • undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)

  • nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination (CVE-2026-27135)

  • Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing (CVE-2026-21712)

  • Node.js: Node.js: Denial of Service due to crafted HTTP __proto__ header (CVE-2026-21710)

  • Node.js: Node.js: Information disclosure due to fs.realpathSync.native() bypassing filesystem read restrictions (CVE-2026-21715)

  • nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership via incomplete security fix. (CVE-2026-21716)

  • Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket permission checks (CVE-2026-21711)

  • Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)

  • Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames (CVE-2026-21714)

  • nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash collisions (CVE-2026-21717)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
RLSA-2026:7350
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRLSA-2026:7670 7.5

Important: nodejs:24 security update

Node.js is a software development platform for building fast and scalable network applications in the JavaScript programming language.

Security Fix(es):

  • nodejs: Nodejs denial of service (CVE-2026-21637)

  • minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)

  • undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)

  • undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)

  • undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate decompression (CVE-2026-1526)

  • undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter (CVE-2026-2229)

  • undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers (CVE-2026-1525)

  • undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)

  • nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination (CVE-2026-27135)

  • Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing (CVE-2026-21712)

  • Node.js: Node.js: Denial of Service due to crafted HTTP __proto__ header (CVE-2026-21710)

  • Node.js: Node.js: Information disclosure due to fs.realpathSync.native() bypassing filesystem read restrictions (CVE-2026-21715)

  • nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership via incomplete security fix. (CVE-2026-21716)

  • Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket permission checks (CVE-2026-21711)

  • Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)

  • Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames (CVE-2026-21714)

  • nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash collisions (CVE-2026-21717)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
RLSA-2026:7670
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRLSA-2026:7675 7.5

Important: nodejs24 security update

Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.

Security Fix(es):

  • nodejs: Nodejs denial of service (CVE-2026-21637)

  • brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion (CVE-2026-25547)

  • minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)

  • undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)

  • undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)

  • undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate decompression (CVE-2026-1526)

  • undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter (CVE-2026-2229)

  • undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers (CVE-2026-1525)

  • undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)

  • nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination (CVE-2026-27135)

  • Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing (CVE-2026-21712)

  • Node.js: Node.js: Denial of Service due to crafted HTTP __proto__ header (CVE-2026-21710)

  • Node.js: Node.js: Information disclosure due to fs.realpathSync.native() bypassing filesystem read restrictions (CVE-2026-21715)

  • nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership via incomplete security fix. (CVE-2026-21716)

  • Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket permission checks (CVE-2026-21711)

  • Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)

  • Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames (CVE-2026-21714)

  • nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash collisions (CVE-2026-21717)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
RLSA-2026:7675
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVROOT-APP-NPM-CVE-2026-1527 4.6

CVE-2026-1527 in undici - Patched by Root

Root has patched CVE-2026-1527 in the undici package for Root:npm. Multiple fixed versions available.

Record
ROOT-APP-NPM-CVE-2026-1527
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-1527 4.6

ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to: * Inject arbitrary HTTP headers * Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch) The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters: // lib/dispatcher/client-h1.js:1121 if (upgrade) { header += connection: upgrade\r\nupgrade: ${upgrade}\r\n }

Record
UBUNTU-CVE-2026-1527
CVSS 3.1
4.6 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVALSA-2026:7350 No score

Important: nodejs:24 security update

Node.js is a software development platform for building fast and scalable network applications in the JavaScript programming language.

Security Fix(es):

  • nodejs: Nodejs denial of service (CVE-2026-21637)
  • brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion (CVE-2026-25547)
  • minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)
  • undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)
  • undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)
  • undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate decompression (CVE-2026-1526)
  • undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter (CVE-2026-2229)
  • undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers (CVE-2026-1525)
  • undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)
  • nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination (CVE-2026-27135)
  • Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing (CVE-2026-21712)
  • Node.js: Node.js: Denial of Service due to crafted HTTP __proto__ header (CVE-2026-21710)
  • Node.js: Node.js: Information disclosure due to fs.realpathSync.native() bypassing filesystem read restrictions (CVE-2026-21715)
  • nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership via incomplete security fix. (CVE-2026-21716)
  • Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket permission checks (CVE-2026-21711)
  • Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)
  • Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames (CVE-2026-21714)
  • nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash collisions (CVE-2026-21717)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
ALSA-2026:7350
Updated
2026-11-02
OSVALSA-2026:7670 No score

Important: nodejs:24 security update

Node.js is a software development platform for building fast and scalable network applications in the JavaScript programming language.

Security Fix(es):

  • nodejs: Nodejs denial of service (CVE-2026-21637)
  • minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)
  • undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)
  • undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)
  • undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate decompression (CVE-2026-1526)
  • undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter (CVE-2026-2229)
  • undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers (CVE-2026-1525)
  • undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)
  • nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination (CVE-2026-27135)
  • Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing (CVE-2026-21712)
  • Node.js: Node.js: Denial of Service due to crafted HTTP __proto__ header (CVE-2026-21710)
  • Node.js: Node.js: Information disclosure due to fs.realpathSync.native() bypassing filesystem read restrictions (CVE-2026-21715)
  • nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership via incomplete security fix. (CVE-2026-21716)
  • Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket permission checks (CVE-2026-21711)
  • Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)
  • Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames (CVE-2026-21714)
  • nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash collisions (CVE-2026-21717)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
ALSA-2026:7670
Updated
2026-11-02
OSVALSA-2026:7675 No score

Important: nodejs24 security update

Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.

Security Fix(es):

  • nodejs: Nodejs denial of service (CVE-2026-21637)
  • brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion (CVE-2026-25547)
  • minimatch: minimatch: Denial of Service via specially crafted glob patterns (CVE-2026-26996)
  • undici: Undici: Denial of Service due to uncontrolled resource consumption (CVE-2026-2581)
  • undici: Undici: HTTP header injection and request smuggling vulnerability (CVE-2026-1527)
  • undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate decompression (CVE-2026-1526)
  • undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter (CVE-2026-2229)
  • undici: Undici: HTTP Request Smuggling and Denial of Service due to duplicate Content-Length headers (CVE-2026-1525)
  • undici: undici: Denial of Service via crafted WebSocket frame with large length (CVE-2026-1528)
  • nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination (CVE-2026-27135)
  • Node.js: Node.js: Denial of Service via malformed Internationalized Domain Name processing (CVE-2026-21712)
  • Node.js: Node.js: Denial of Service due to crafted HTTP __proto__ header (CVE-2026-21710)
  • Node.js: Node.js: Information disclosure due to fs.realpathSync.native() bypassing filesystem read restrictions (CVE-2026-21715)
  • nodejs: Node.js: Permission bypass allows unauthorized modification of file permissions and ownership via incomplete security fix. (CVE-2026-21716)
  • Node.js: Node.js: Unauthorized inter-process communication due to missing Unix Domain Socket permission checks (CVE-2026-21711)
  • Node.js: Node.js: Information disclosure via timing oracle in HMAC verification (CVE-2026-21713)
  • Node.js: Node.js: Memory leak and Denial of Service via crafted HTTP/2 WINDOW_UPDATE frames (CVE-2026-21714)
  • nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash collisions (CVE-2026-21717)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
ALSA-2026:7675
Updated
2026-11-02
OSVCLSA-2026-1775435423 No score

TuxCare security update for undici (3 CVEs)

TuxCare rebuilt undici to address 3 CVEs. Fixed in 5.29.0-tuxcare.4.

Record
CLSA-2026-1775435423
Updated
2026-11-02
OSVCLSA-2026-1785204338 No score

TuxCare security update for undici (6 CVEs)

TuxCare rebuilt undici to address 6 CVEs. Fixed in 6.11.1-tuxcare.4.

Record
CLSA-2026-1785204338
Updated
2026-11-02
OSVCLSA-2026-1790542220 No score

TuxCare security update for undici (12 CVEs)

TuxCare rebuilt undici to address 12 CVEs. Fixed in 6.19.7-tuxcare.1.

Record
CLSA-2026-1790542220
Updated
2026-11-02
OSVCLSA-2026-1791028079 No score

TuxCare security update for undici (11 CVEs)

TuxCare rebuilt undici to address 11 CVEs. Fixed in 6.19.5-tuxcare.2.

Record
CLSA-2026-1791028079
Updated
2026-11-02
OSVCLSA-2026-1791973587 No score

TuxCare security update for undici (15 CVEs)

TuxCare rebuilt undici to address 15 CVEs. Fixed in 6.20.0-tuxcare.3.

Record
CLSA-2026-1791973587
Updated
2026-11-02
OSVCLSA-2026-1792867313 No score

TuxCare security update for undici-types (15 CVEs)

TuxCare rebuilt undici-types to address 15 CVEs. Fixed in 6.20.0-tuxcare.3.

Record
CLSA-2026-1792867313
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
undici
npm
 before 6.24.0
6.24.0
undici
npm
 7.0.0 up to 7.24.0
7.24.0
nodejs
AlmaLinux:9
From an advisory covering 18 CVEs
 before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
1:24.14.1-2.module_el9.7.0+222+ef1c61e1
nodejs-devel
AlmaLinux:9
From an advisory covering 18 CVEs
 before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
1:24.14.1-2.module_el9.7.0+222+ef1c61e1
nodejs-docs
AlmaLinux:9
From an advisory covering 18 CVEs
 before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
1:24.14.1-2.module_el9.7.0+222+ef1c61e1
nodejs-full-i18n
AlmaLinux:9
From an advisory covering 18 CVEs
 before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
1:24.14.1-2.module_el9.7.0+222+ef1c61e1
nodejs-libs
AlmaLinux:9
From an advisory covering 18 CVEs
 before 1:24.14.1-2.module_el9.7.0+222+ef1c61e1
1:24.14.1-2.module_el9.7.0+222+ef1c61e1
nodejs-nodemon
AlmaLinux:9
From an advisory covering 18 CVEs
 before 3.0.3-3.module_el9.7.0+209+ecf6523e
3.0.3-3.module_el9.7.0+209+ecf6523e
nodejs-packaging
AlmaLinux:9
From an advisory covering 18 CVEs
 before 2021.06-6.module_el9.7.0+209+ecf6523e
2021.06-6.module_el9.7.0+209+ecf6523e
nodejs-packaging-bundler
AlmaLinux:9
From an advisory covering 18 CVEs
 before 2021.06-6.module_el9.7.0+198+8bf605ba
2021.06-6.module_el9.7.0+198+8bf605ba
Show 74 moreShow less
Affected packages
PackageAffectedFixed
npm
AlmaLinux:9
From an advisory covering 18 CVEs
 before 1:11.11.0-1.24.14.1.2.module_el9.7.0+222+ef1c61e1
1:11.11.0-1.24.14.1.2.module_el9.7.0+222+ef1c61e1
v8-13.6-devel
AlmaLinux:9
From an advisory covering 18 CVEs
 before 3:13.6.233.17-1.24.14.1.2.module_el9.7.0+222+ef1c61e1
3:13.6.233.17-1.24.14.1.2.module_el9.7.0+222+ef1c61e1
nodejs
AlmaLinux:8
From an advisory covering 17 CVEs
 before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
1:24.14.1-2.module_el8.10.0+4160+4819ac42
nodejs-devel
AlmaLinux:8
From an advisory covering 17 CVEs
 before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
1:24.14.1-2.module_el8.10.0+4160+4819ac42
nodejs-docs
AlmaLinux:8
From an advisory covering 17 CVEs
 before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
1:24.14.1-2.module_el8.10.0+4160+4819ac42
nodejs-full-i18n
AlmaLinux:8
From an advisory covering 17 CVEs
 before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
1:24.14.1-2.module_el8.10.0+4160+4819ac42
nodejs-libs
AlmaLinux:8
From an advisory covering 17 CVEs
 before 1:24.14.1-2.module_el8.10.0+4160+4819ac42
1:24.14.1-2.module_el8.10.0+4160+4819ac42
nodejs-nodemon
AlmaLinux:8
From an advisory covering 17 CVEs
 before 3.0.3-1.module_el8.10.0+4061+f8ceeab9
3.0.3-1.module_el8.10.0+4061+f8ceeab9
nodejs-packaging
AlmaLinux:8
From an advisory covering 17 CVEs
 before 2021.06-6.module_el8.10.0+4086+70facd4a
2021.06-6.module_el8.10.0+4086+70facd4a
nodejs-packaging-bundler
AlmaLinux:8
From an advisory covering 17 CVEs
 before 2021.06-6.module_el8.10.0+4086+70facd4a
2021.06-6.module_el8.10.0+4086+70facd4a
npm
AlmaLinux:8
From an advisory covering 17 CVEs
 before 1:11.11.0-1.24.14.1.2.module_el8.10.0+4160+4819ac42
1:11.11.0-1.24.14.1.2.module_el8.10.0+4160+4819ac42
v8-13.6-devel
AlmaLinux:8
From an advisory covering 17 CVEs
 before 3:13.6.233.17-1.24.14.1.2.module_el8.10.0+4160+4819ac42
3:13.6.233.17-1.24.14.1.2.module_el8.10.0+4160+4819ac42
nodejs24-docs
AlmaLinux:10
From an advisory covering 18 CVEs
 before 1:24.14.1-2.el10_1
1:24.14.1-2.el10_1
nodejs24-npm
AlmaLinux:10
From an advisory covering 18 CVEs
 before 1:11.11.0-1.24.14.1.2.el10_1
1:11.11.0-1.24.14.1.2.el10_1
nodejs
Alpaquita:23
 18.16.0-r0 up to 20.20.2-r0
20.20.2-r0
nodejs
Alpaquita:25
 22.16.0-r1 up to 22.22.2-r0
22.22.2-r0
nodejs
Alpaquita:stream
 22.16.0-r1 up to 24.16.0-r0
24.16.0-r0
nodejs
BellSoft Hardened Containers:23
 18.16.0-r0 up to 20.20.2-r0
20.20.2-r0
nodejs
BellSoft Hardened Containers:25
 22.16.0-r1 up to 22.22.2-r0
22.22.2-r0
nodejs
BellSoft Hardened Containers:stream
 22.16.0-r1 up to 24.16.0-r0
24.16.0-r0
undici
TuxCare:npm
From an advisory covering 3 CVEs
 5.29.0-tuxcare.0 up to 5.29.0-tuxcare.4, plus listed versions
5.29.05.29.0-tuxcare.15.29.0-tuxcare.25.29.0-tuxcare.3
5.29.0-tuxcare.4
undici
TuxCare:npm
From an advisory covering 6 CVEs
 6.11.1-tuxcare.0 up to 6.11.1-tuxcare.4, plus listed versions
6.11.16.11.1-tuxcare.16.11.1-tuxcare.26.11.1-tuxcare.3
6.11.1-tuxcare.4
undici
TuxCare:npm
From an advisory covering 12 CVEs
 6.19.7-tuxcare.0 up to 6.19.7-tuxcare.1, plus listed versions
6.19.7
6.19.7-tuxcare.1
undici
TuxCare:npm
From an advisory covering 11 CVEs
 6.19.5-tuxcare.0 up to 6.19.5-tuxcare.2, plus listed versions
6.19.56.19.5-tuxcare.1
6.19.5-tuxcare.2
undici
TuxCare:npm
From an advisory covering 15 CVEs
 6.20.0-tuxcare.0 up to 6.20.0-tuxcare.3, plus listed versions
6.20.06.20.0-tuxcare.16.20.0-tuxcare.2
6.20.0-tuxcare.3
undici-types
TuxCare:npm
From an advisory covering 15 CVEs
 6.20.0-tuxcare.0 up to 6.20.0-tuxcare.3, plus listed versions
6.20.06.20.0-tuxcare.16.20.0-tuxcare.2
6.20.0-tuxcare.3
node-undici
Debian:13
 All versions, plus listed versions
7.15.0+dfsg+~cs3.2.0-17.15.0+dfsg+~cs3.2.0-37.16.0+dfsg+~cs3.2.0-17.16.0+dfsg+~cs3.2.0-27.18.2+dfsg+~cs3.2.0-1
Show 11 moreShow less
7.24.5+dfsg+~cs3.2.0-17.24.6+dfsg+~cs3.2.0-17.24.6+dfsg+~cs3.2.0-27.24.6+dfsg+~cs3.2.0-37.3.0+dfsg1+~cs24.12.11-17.3.0+dfsg1+~cs24.12.11-28.10.2+dfsg+~cs3.2.2-18.5.0+dfsg+~cs3.2.0-18.5.0+dfsg+~cs3.2.0-28.5.0+dfsg+~cs3.2.0-38.9.0+dfsg+~cs3.2.0-1
 None known
node-undici
Debian:14
 before 7.24.5+dfsg+~cs3.2.0-1, plus listed versions
7.15.0+dfsg+~cs3.2.0-17.15.0+dfsg+~cs3.2.0-37.16.0+dfsg+~cs3.2.0-17.16.0+dfsg+~cs3.2.0-27.18.2+dfsg+~cs3.2.0-17.3.0+dfsg1+~cs24.12.11-17.3.0+dfsg1+~cs24.12.11-2
7.24.5+dfsg+~cs3.2.0-1
nodejs
Red Hat:enterprise_linux:9::appstream
From an advisory covering 18 CVEs
 before 1:24.14.1-2.module+el9.7.0+24166+51c9666b
1:24.14.1-2.module+el9.7.0+24166+51c9666b
nodejs-debuginfo
Red Hat:enterprise_linux:9::appstream
From an advisory covering 18 CVEs
 before 1:24.14.1-2.module+el9.7.0+24166+51c9666b
1:24.14.1-2.module+el9.7.0+24166+51c9666b
nodejs-debugsource
Red Hat:enterprise_linux:9::appstream
From an advisory covering 18 CVEs
 before 1:24.14.1-2.module+el9.7.0+24166+51c9666b
1:24.14.1-2.module+el9.7.0+24166+51c9666b
nodejs-devel
Red Hat:enterprise_linux:9::appstream
From an advisory covering 18 CVEs
 before 1:24.14.1-2.module+el9.7.0+24166+51c9666b
1:24.14.1-2.module+el9.7.0+24166+51c9666b
nodejs-docs
Red Hat:enterprise_linux:9::appstream
From an advisory covering 18 CVEs
 before 1:24.14.1-2.module+el9.7.0+24166+51c9666b
1:24.14.1-2.module+el9.7.0+24166+51c9666b
nodejs-full-i18n
Red Hat:enterprise_linux:9::appstream
From an advisory covering 18 CVEs
 before 1:24.14.1-2.module+el9.7.0+24166+51c9666b
1:24.14.1-2.module+el9.7.0+24166+51c9666b
nodejs-libs
Red Hat:enterprise_linux:9::appstream
From an advisory covering 18 CVEs
 before 1:24.14.1-2.module+el9.7.0+24166+51c9666b
1:24.14.1-2.module+el9.7.0+24166+51c9666b
nodejs-libs-debuginfo
Red Hat:enterprise_linux:9::appstream
From an advisory covering 18 CVEs
 before 1:24.14.1-2.module+el9.7.0+24166+51c9666b
1:24.14.1-2.module+el9.7.0+24166+51c9666b
nodejs-nodemon
Red Hat:enterprise_linux:9::appstream
From an advisory covering 18 CVEs
 before 0:3.0.3-3.module+el9.7.0+24166+51c9666b
0:3.0.3-3.module+el9.7.0+24166+51c9666b
nodejs-packaging
Red Hat:enterprise_linux:9::appstream
From an advisory covering 18 CVEs
 before 0:2021.06-6.module+el9.7.0+24166+51c9666b
0:2021.06-6.module+el9.7.0+24166+51c9666b
nodejs-packaging-bundler
Red Hat:enterprise_linux:9::appstream
From an advisory covering 18 CVEs
 before 0:2021.06-6.module+el9.7.0+24166+51c9666b
0:2021.06-6.module+el9.7.0+24166+51c9666b
npm
Red Hat:enterprise_linux:9::appstream
From an advisory covering 18 CVEs
 before 1:11.11.0-1.24.14.1.2.module+el9.7.0+24166+51c9666b
1:11.11.0-1.24.14.1.2.module+el9.7.0+24166+51c9666b
v8-13.6-devel
Red Hat:enterprise_linux:9::appstream
From an advisory covering 18 CVEs
 before 3:13.6.233.17-1.24.14.1.2.module+el9.7.0+24166+51c9666b
3:13.6.233.17-1.24.14.1.2.module+el9.7.0+24166+51c9666b
nodejs
Red Hat:enterprise_linux:8::appstream
From an advisory covering 17 CVEs
 before 1:24.14.1-2.module+el8.10.0+24190+49a46c75
1:24.14.1-2.module+el8.10.0+24190+49a46c75
nodejs-debuginfo
Red Hat:enterprise_linux:8::appstream
From an advisory covering 17 CVEs
 before 1:24.14.1-2.module+el8.10.0+24190+49a46c75
1:24.14.1-2.module+el8.10.0+24190+49a46c75
nodejs-debugsource
Red Hat:enterprise_linux:8::appstream
From an advisory covering 17 CVEs
 before 1:24.14.1-2.module+el8.10.0+24190+49a46c75
1:24.14.1-2.module+el8.10.0+24190+49a46c75
nodejs-devel
Red Hat:enterprise_linux:8::appstream
From an advisory covering 17 CVEs
 before 1:24.14.1-2.module+el8.10.0+24190+49a46c75
1:24.14.1-2.module+el8.10.0+24190+49a46c75
nodejs-docs
Red Hat:enterprise_linux:8::appstream
From an advisory covering 17 CVEs
 before 1:24.14.1-2.module+el8.10.0+24190+49a46c75
1:24.14.1-2.module+el8.10.0+24190+49a46c75
nodejs-full-i18n
Red Hat:enterprise_linux:8::appstream
From an advisory covering 17 CVEs
 before 1:24.14.1-2.module+el8.10.0+24190+49a46c75
1:24.14.1-2.module+el8.10.0+24190+49a46c75
nodejs-libs
Red Hat:enterprise_linux:8::appstream
From an advisory covering 17 CVEs
 before 1:24.14.1-2.module+el8.10.0+24190+49a46c75
1:24.14.1-2.module+el8.10.0+24190+49a46c75
nodejs-libs-debuginfo
Red Hat:enterprise_linux:8::appstream
From an advisory covering 17 CVEs
 before 1:24.14.1-2.module+el8.10.0+24190+49a46c75
1:24.14.1-2.module+el8.10.0+24190+49a46c75
nodejs-nodemon
Red Hat:enterprise_linux:8::appstream
From an advisory covering 17 CVEs
 before 0:3.0.3-1.module+el8.10.0+24190+49a46c75
0:3.0.3-1.module+el8.10.0+24190+49a46c75
nodejs-packaging
Red Hat:enterprise_linux:8::appstream
From an advisory covering 17 CVEs
 before 0:2021.06-6.module+el8.10.0+24190+49a46c75
0:2021.06-6.module+el8.10.0+24190+49a46c75
nodejs-packaging-bundler
Red Hat:enterprise_linux:8::appstream
From an advisory covering 17 CVEs
 before 0:2021.06-6.module+el8.10.0+24190+49a46c75
0:2021.06-6.module+el8.10.0+24190+49a46c75
npm
Red Hat:enterprise_linux:8::appstream
From an advisory covering 17 CVEs
 before 1:11.11.0-1.24.14.1.2.module+el8.10.0+24190+49a46c75
1:11.11.0-1.24.14.1.2.module+el8.10.0+24190+49a46c75
v8-13.6-devel
Red Hat:enterprise_linux:8::appstream
From an advisory covering 17 CVEs
 before 3:13.6.233.17-1.24.14.1.2.module+el8.10.0+24190+49a46c75
3:13.6.233.17-1.24.14.1.2.module+el8.10.0+24190+49a46c75
nodejs24
Red Hat:enterprise_linux:10.1
From an advisory covering 18 CVEs
 before 1:24.14.1-2.el10_1
1:24.14.1-2.el10_1
nodejs24-debuginfo
Red Hat:enterprise_linux:10.1
From an advisory covering 18 CVEs
 before 1:24.14.1-2.el10_1
1:24.14.1-2.el10_1
nodejs24-debugsource
Red Hat:enterprise_linux:10.1
From an advisory covering 18 CVEs
 before 1:24.14.1-2.el10_1
1:24.14.1-2.el10_1
nodejs24-devel
Red Hat:enterprise_linux:10.1
From an advisory covering 18 CVEs
 before 1:24.14.1-2.el10_1
1:24.14.1-2.el10_1
nodejs24-docs
Red Hat:enterprise_linux:10.1
From an advisory covering 18 CVEs
 before 1:24.14.1-2.el10_1
1:24.14.1-2.el10_1
nodejs24-full-i18n
Red Hat:enterprise_linux:10.1
From an advisory covering 18 CVEs
 before 1:24.14.1-2.el10_1
1:24.14.1-2.el10_1
nodejs24-libs
Red Hat:enterprise_linux:10.1
From an advisory covering 18 CVEs
 before 1:24.14.1-2.el10_1
1:24.14.1-2.el10_1
nodejs24-libs-debuginfo
Red Hat:enterprise_linux:10.1
From an advisory covering 18 CVEs
 before 1:24.14.1-2.el10_1
1:24.14.1-2.el10_1
nodejs24-npm
Red Hat:enterprise_linux:10.1
From an advisory covering 18 CVEs
 before 1:11.11.0-1.24.14.1.2.el10_1
1:11.11.0-1.24.14.1.2.el10_1
nodejs-nodemon
Rocky Linux:9
From an advisory covering 18 CVEs
 before 0:3.0.3-3.module+el9.7.0+40025+0e0cf6b2
0:3.0.3-3.module+el9.7.0+40025+0e0cf6b2
nodejs-packaging
Rocky Linux:9
From an advisory covering 18 CVEs
 before 0:2021.06-6.module+el9.7.0+40052+e32ea525
0:2021.06-6.module+el9.7.0+40052+e32ea525
nodejs-nodemon
Rocky Linux:8
From an advisory covering 17 CVEs
 before 0:3.0.3-1.module+el8.10.0+2084+ab509703
0:3.0.3-1.module+el8.10.0+2084+ab509703
nodejs-packaging
Rocky Linux:8
From an advisory covering 17 CVEs
 before 0:2021.06-6.module+el8.10.0+40048+6d99f608
0:2021.06-6.module+el8.10.0+40048+6d99f608
nodejs24
Rocky Linux:10
From an advisory covering 18 CVEs
 before 1:24.14.1-2.el10_1
1:24.14.1-2.el10_1
undici
Root:npm
 before 6.21.2-aikido.6
6.21.2-aikido.65.29.0-aikido.36.19.2-aikido.76.21.3-aikido.87.5.0-aikido.66.21.3-aikido.95.29.0-aikido.45.28.5-aikido.15.28.5-aikido.26.20.1-aikido.36.21.3-aikido.106.21.3-aikido.116.19.2-aikido.86.21.2-aikido.76.19.8-aikido.26.21.1-aikido.36.19.2-aikido.96.19.2-aikido.106.19.8-aikido.36.19.8-aikido.45.29.0-aikido.55.28.5-aikido.35.29.0-aikido.65.28.5-aikido.47.5.0-aikido.77.5.0-aikido.86.19.8-aikido.56.21.1-aikido.46.20.1-aikido.46.21.3-aikido.126.21.1-aikido.56.19.8-aikido.6
@rootio/undici
Root:npm
 before 6.21.3-root.io.4
6.21.3-root.io.46.21.3-root.io.56.19.2-root.io.27.5.0-root.io.36.21.2-root.io.36.21.3-root.io.66.19.2-root.io.36.21.2-root.io.47.5.0-root.io.46.21.2-root.io.57.5.0-root.io.56.21.3-root.io.76.19.2-root.io.46.19.2-root.io.56.19.2-root.io.65.29.0-root.io.26.21.2-root.io.65.29.0-root.io.36.19.2-root.io.76.21.3-root.io.87.5.0-root.io.66.21.3-root.io.95.29.0-root.io.45.28.5-root.io.15.28.5-root.io.26.20.1-root.io.36.21.3-root.io.106.21.3-root.io.116.19.2-root.io.86.21.2-root.io.76.19.8-root.io.26.21.1-root.io.36.19.2-root.io.96.19.2-root.io.106.19.8-root.io.36.19.8-root.io.45.29.0-root.io.55.28.5-root.io.35.29.0-root.io.65.28.5-root.io.47.5.0-root.io.77.5.0-root.io.86.19.8-root.io.56.21.1-root.io.46.20.1-root.io.46.21.3-root.io.126.21.1-root.io.56.19.8-root.io.6
node-undici
Ubuntu:24.04:LTS
 All versions, plus listed versions
5.22.1+dfsg1+~cs20.10.10.2-1ubuntu15.26.3+dfsg1+~cs23.10.12-2
 None known
node-undici
Ubuntu:25.10
 All versions, plus listed versions
7.3.0+dfsg1+~cs24.12.11-17.3.0+dfsg1+~cs24.12.11-2
 None known
node-undici
Ubuntu:26.10
 All versions, plus listed versions
7.18.2+dfsg+~cs3.2.0-1build17.24.6+dfsg+~cs3.2.0-38.5.0+dfsg+~cs3.2.0-28.5.0+dfsg+~cs3.2.0-38.9.0+dfsg+~cs3.2.0-1
 None known
node-undici
Ubuntu:26.04:LTS
 All versions, plus listed versions
7.3.0+dfsg1+~cs24.12.11-27.16.0+dfsg+~cs3.2.0-27.18.2+dfsg+~cs3.2.0-17.18.2+dfsg+~cs3.2.0-1build1
 None known

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-1527 is a medium vulnerability (CVSS 4.6) in Nodejs Undici, published March 12, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.32%, the 24th percentile. Fixed in undici 6.24.0.

References

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