CVE-2026-120415
undici vulnerable to cross-origin credential disclosure via array-of-tuples headers bypassing redirect stripping
undici is an HTTP client for Node.js. In versions 7.0.0 through 7.30.1 and 8.0.0 through 8.12.3, the redirect interceptor strips sensitive headers such as Authorization, Cookie, Proxy-Authorization, and Host when a request is redirected to a different origin, but when request headers are supplied as an array of name and value tuples (a valid documented input, for example from Object.entries), the redirect handler misreads them as a flat list so the header names never match and the sensitive headers are not removed. If a header-normalizing interceptor such as cache or deduplicate is composed outside the redirect interceptor, it then serializes the retained headers onto the cross-origin request, disclosing the caller's origin-bound credentials to the unrelated redirect destination. This is a representation-dependent bypass of the cross-origin header stripping added in CVE-2024-30260. The issue is fixed in undici 7.30.2 and 8.12.4, and users should upgrade to one of those versions or later. As a workaround, supply request headers as a plain object or a flat name and value array rather than an array of tuples, or compose the redirect interceptor outside the normalizing interceptor.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used 5.9
undici vulnerable to cross-origin credential disclosure via array-of-tuples headers bypassing redirect stripping
undici is an HTTP client for Node.js. In versions 7.0.0 through 7.30.1 and 8.0.0 through 8.12.3, the redirect interceptor strips sensitive headers such as Authorization, Cookie, Proxy-Authorization, and Host when a request is redirected to a different origin, but when request headers are supplied as an array of name and value tuples (a valid documented input, for example from Object.entries), the redirect handler misreads them as a flat list so the header names never match and the sensitive headers are not removed. If a header-normalizing interceptor such as cache or deduplicate is composed outside the redirect interceptor, it then serializes the retained headers onto the cross-origin request, disclosing the caller's origin-bound credentials to the unrelated redirect destination. This is a representation-dependent bypass of the cross-origin header stripping added in CVE-2024-30260. The issue is fixed in undici 7.30.2 and 8.12.4, and users should upgrade to one of those versions or later. As a workaround, supply request headers as a plain object or a flat name and value array rather than an array of tuples, or compose the redirect interceptor outside the normalizing interceptor.
- Record
CVE-2026-120415- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-200, CWE-212
- Updated
- 2026-11-10
EUVDEUVD-2026-118183 5.9
undici is an HTTP client for Node.js. In versions 7.0.0 through 7.30.1 and 8.0.0 through 8.12.3, the redirect interceptor strips sensitive headers such as Authorization, Cookie, Proxy-Authorization, and Host when a request is redirected to a different origin, but when request headers are supplied as an array of name and value tuples (a valid documented input, for example from Object.entries), the redirect handler misreads them as a flat list so the header names never match and the sensitive headers are not removed. If a header-normalizing interceptor such as cache or deduplicate is composed outside the redirect interceptor, it then serializes the retained headers onto the cross-origin request, disclosing the caller's origin-bound credentials to the unrelated redirect destination. This is a representation-dependent bypass of the cross-origin header stripping added in CVE-2024-30260. The issue is fixed in undici 7.30.2 and 8.12.4, and users should upgrade to one of those versions or later. As a workaround, supply request headers as a plain object or a flat name and value array rather than an array of tuples, or compose the redirect interceptor outside the normalizing interceptor.
- Record
EUVD-2026-118183- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-10
NVD 5.9
undici is an HTTP client for Node.js. In versions 7.0.0 through 7.30.1 and 8.0.0 through 8.12.3, the redirect interceptor strips sensitive headers such as Authorization, Cookie, Proxy-Authorization, and Host when a request is redirected to a different origin, but when request headers are supplied as an array of name and value tuples (a valid documented input, for example from Object.entries), the redirect handler misreads them as a flat list so the header names never match and the sensitive headers are not removed. If a header-normalizing interceptor such as cache or deduplicate is composed outside the redirect interceptor, it then serializes the retained headers onto the cross-origin request, disclosing the caller's origin-bound credentials to the unrelated redirect destination. This is a representation-dependent bypass of the cross-origin header stripping added in CVE-2024-30260. The issue is fixed in undici 7.30.2 and 8.12.4, and users should upgrade to one of those versions or later. As a workaround, supply request headers as a plain object or a flat name and value array rather than an array of tuples, or compose the redirect interceptor outside the normalizing interceptor.
- Record
CVE-2026-120415- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-200, CWE-212
- Updated
- 2026-11-06
OSV 5.9
undici vulnerable to cross-origin credential disclosure via array-of-tuples headers bypassing redirect stripping
undici is an HTTP client for Node.js. In versions 7.0.0 through 7.30.1 and 8.0.0 through 8.12.3, the redirect interceptor strips sensitive headers such as Authorization, Cookie, Proxy-Authorization, and Host when a request is redirected to a different origin, but when request headers are supplied as an array of name and value tuples (a valid documented input, for example from Object.entries), the redirect handler misreads them as a flat list so the header names never match and the sensitive headers are not removed. If a header-normalizing interceptor such as cache or deduplicate is composed outside the redirect interceptor, it then serializes the retained headers onto the cross-origin request, disclosing the caller's origin-bound credentials to the unrelated redirect destination. This is a representation-dependent bypass of the cross-origin header stripping added in CVE-2024-30260. The issue is fixed in undici 7.30.2 and 8.12.4, and users should upgrade to one of those versions or later. As a workaround, supply request headers as a plain object or a flat name and value array rather than an array of tuples, or compose the redirect interceptor outside the normalizing interceptor.
- Record
CVE-2026-120415- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-200, CWE-212
- Updated
- 2026-11-07
OSVDEBIAN-CVE-2026-120415 5.9
undici is an HTTP client for Node.js. In versions 7.0.0 through 7.30.1 and 8.0.0 through 8.12.3, the redirect interceptor strips sensitive headers such as Authorization, Cookie, Proxy-Authorization, and Host when a request is redirected to a different origin, but when request headers are supplied as an array of name and value tuples (a valid documented input, for example from Object.entries), the redirect handler misreads them as a flat list so the header names never match and the sensitive headers are not removed. If a header-normalizing interceptor such as cache or deduplicate is composed outside the redirect interceptor, it then serializes the retained headers onto the cross-origin request, disclosing the caller's origin-bound credentials to the unrelated redirect destination. This is a representation-dependent bypass of the cross-origin header stripping added in CVE-2024-30260. The issue is fixed in undici 7.30.2 and 8.12.4, and users should upgrade to one of those versions or later. As a workaround, supply request headers as a plain object or a flat name and value array rather than an array of tuples, or compose the redirect interceptor outside the normalizing interceptor.
- Record
DEBIAN-CVE-2026-120415- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-11
OSVUBUNTU-CVE-2026-120415 5.9
undici is an HTTP client for Node.js. In versions 7.0.0 through 7.30.1 and 8.0.0 through 8.12.3, the redirect interceptor strips sensitive headers such as Authorization, Cookie, Proxy-Authorization, and Host when a request is redirected to a different origin, but when request headers are supplied as an array of name and value tuples (a valid documented input, for example from Object.entries), the redirect handler misreads them as a flat list so the header names never match and the sensitive headers are not removed. If a header-normalizing interceptor such as cache or deduplicate is composed outside the redirect interceptor, it then serializes the retained headers onto the cross-origin request, disclosing the caller's origin-bound credentials to the unrelated redirect destination. This is a representation-dependent bypass of the cross-origin header stripping added in CVE-2024-30260. The issue is fixed in undici 7.30.2 and 8.12.4, and users should upgrade to one of those versions or later. As a workaround, supply request headers as a plain object or a flat name and value array rather than an array of tuples, or compose the redirect interceptor outside the normalizing interceptor.
- Record
UBUNTU-CVE-2026-120415- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-07
OSVAZL-113227No score
CVE-2026-120415 affecting package nodejs 24.22.1-1
undici is an HTTP client for Node.js. In versions 7.0.0 through 7.30.1 and 8.0.0 through 8.12.3, the redirect interceptor strips sensitive headers such as Authorization, Cookie, Proxy-Authorization, and Host when a request is redirected to a different origin, but when request headers are supplied as an array of name and value tuples (a valid documented input, for example from Object.entries), the redirect handler misreads them as a flat list so the header names never match and the sensitive headers are not removed. If a header-normalizing interceptor such as cache or deduplicate is composed outside the redirect interceptor, it then serializes the retained headers onto the cross-origin request, disclosing the caller's origin-bound credentials to the unrelated redirect destination. This is a representation-dependent bypass of the cross-origin header stripping added in CVE-2024-30260. The issue is fixed in undici 7.30.2 and 8.12.4, and users should upgrade to one of those versions or later. As a workaround, supply request headers as a plain object or a flat name and value array rather than an array of tuples, or compose the redirect interceptor outside the normalizing interceptor.
- Record
AZL-113227- Updated
- 2026-11-11
OSVCLSA-2026-1793974509No score
TuxCare security update for undici (1 CVE)
TuxCare rebuilt undici to address 1 CVE. Fixed in 7.29.1-tuxcare.2.
- Record
CLSA-2026-1793974509- Updated
- 2026-11-06
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
nodejsAzure Linux:3 | through 24.22.1-1 | None known |
undiciTuxCare:npm | 7.29.1-tuxcare.0 up to 7.29.1-tuxcare.2, plus listed versions 7.29.17.29.1-tuxcare.1 | 7.29.1-tuxcare.2 |
node-undiciDebian:12 | All versions, plus listed versions 5.15.0+dfsg1+~cs20.10.9.3-15.15.0+dfsg1+~cs20.10.9.3-1+deb12u15.15.0+dfsg1+~cs20.10.9.3-1+deb12u25.15.0+dfsg1+~cs20.10.9.3-1+deb12u35.15.0+dfsg1+~cs20.10.9.3-1+deb12u4 Show 39 moreShow less5.19.1+dfsg1+~cs20.10.9.5-15.19.1+dfsg1+~cs20.10.9.5-25.22.1+dfsg1+~cs20.10.10.2-15.26.3+dfsg1+~cs23.10.12-15.26.3+dfsg1+~cs23.10.12-25.26.3+dfsg1+~cs23.10.12-35.28.0+dfsg1+~cs23.11.12.3-15.28.0+dfsg1+~cs23.11.12.3-25.28.2+dfsg1+~cs23.11.12.3-15.28.2+dfsg1+~cs23.11.12.3-25.28.2+dfsg1+~cs23.11.12.3-35.28.2+dfsg1+~cs23.11.12.3-45.28.2+dfsg1+~cs23.11.12.3-55.28.2+dfsg1+~cs23.11.12.3-65.28.4+dfsg1+~cs23.12.11-15.28.4+dfsg1+~cs23.12.11-27.1.0+dfsg1+~cs24.12.10-17.15.0+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+~cs3.2.0-17.2.3+dfsg1+~cs24.12.11-17.2.3+dfsg1+~cs24.12.11-27.24.5+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+~cs3.2.2-18.12.1+dfsg+~cs3.2.3-18.12.2+dfsg+~cs3.2.3-18.12.2+dfsg+~cs3.2.3-28.12.4+dfsg+~cs3.2.5-18.5.0+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-undiciDebian: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 15 moreShow less7.24.5+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+~cs3.2.2-18.12.1+dfsg+~cs3.2.3-18.12.2+dfsg+~cs3.2.3-18.12.2+dfsg+~cs3.2.3-28.12.4+dfsg+~cs3.2.5-18.5.0+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-undiciDebian:14 | 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 15 moreShow less7.24.5+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+~cs3.2.2-18.12.1+dfsg+~cs3.2.3-18.12.2+dfsg+~cs3.2.3-18.12.2+dfsg+~cs3.2.3-28.12.4+dfsg+~cs3.2.5-18.5.0+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-undiciUbuntu: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-undiciUbuntu: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-undiciUbuntu: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
| Recorded | Changed | Sources |
|---|---|---|
| affected, aliases, references | OSV | |
| affected | CVE List, EUVD, OSV | |
| affected, aliases, references | OSV | |
| aliases, references | OSV | |
| affected, aliases, published, references | NVD, OSV | |
| affected, aliases, facts | NVD, OSV | |
| cwes, severity, title | CVE List | |
| first indexed | EUVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-120415 is a medium vulnerability (CVSS 5.9) in Undici, published November 6, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.30%, the 23rd percentile. Fixed in undici 7.29.1-tuxcare.2.
References
github.com/nodejs/undici/security/advisories/GHSA-9v6h-8rgp-m69f
cna.openjsf.org/security-advisories.html
nvd.nist.gov/vuln/detail/CVE-2026-120415
github.com/CVEProject/cvelistV5/tree/main/cves/2026/120xxx/CVE-2026-120415.json
security-tracker.debian.org/tracker/CVE-2026-120415
ubuntu.com/security/CVE-2026-120415
cve.org/CVERecord?id=CVE-2026-120415