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CVE-2026-27889

NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead

7.5 HighFix available

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port. Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.59%Up 0.5 points since Mar 26, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.5

NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port. Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.

Record
CVE-2026-27889
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-190, CWE-1286
Updated
2026-11-02
EUVDEUVD-2026-15962 7.5

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port. Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.

Record
EUVD-2026-15962
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
GitHub AdvisoriesGHSA-pq2q-rcw4-3hr6 7.5

NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead

Background

NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.

When using WebSockets, a malicious client can trigger a server crash with crafted frames, before authentication.

Problem Description

A missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port.

Affected versions

Version 2 from v2.2.0 onwards, prior to v2.11.14 or v2.12.5

Workarounds

This only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If able to do so, a defense in depth of restricting either of these will mitigate the attack.

Solution

Upgrade the NATS server to a fixed version.

Credits

This was reported to the NATS maintainers by GitHub user Mistz1. Also independently reported by GitHub user jiayuqi7813.

Report by @Mistz1

Summary

An unauthenticated remote attacker can crash the entire nats-server process by sending a single malicious WebSocket frame (15 bytes after the HTTP upgrade handshake). The server fails to validate the RFC 6455 §5.2 requirement that the most significant bit of a 64-bit extended payload length must be zero. The resulting uint64 → int conversion produces a negative value, which bypasses the bounds clamp and triggers an unrecovered panic in the connection's goroutine — killing the entire server process and disconnecting all clients. This affects all platforms (64-bit and 32-bit).

Details

Vulnerable code: server/websocket.go line 278

r.rem = int(binary.BigEndian.Uint64(tmpBuf))

When a WebSocket frame uses the 64-bit extended payload length (length code 127), the server reads 8 bytes and casts the raw uint64 directly to int with no validation. RFC 6455 §5.2 states: "the most significant bit MUST be 0" — but nats-server never checks this.

Attack chain:

  1. The attacker sends a WebSocket frame with the MSB set in the 64-bit length field (e.g., 0x8000000000000001).

  2. At line 278, int(0x8000000000000001) produces -9223372036854775807 on 64-bit Go (two's complement reinterpretation — Go does not panic on integer conversion overflow).

  3. r.rem is now negative. At line 307–311, the bounds clamp fails:

    n = r.rem                    // n = -9223372036854775807
if pos+n > max {             // 14 + (-huge) = negative, NOT > max → FALSE
    n = max - pos            // clamp NEVER fires
}
b = buf[pos : pos+n]         // buf[14 : -9223372036854775793] → PANIC

    The addition pos + n wraps to a negative value (Go signed integer overflow is defined behavior — it wraps silently). Since the negative result is never greater than max, the clamp is skipped. The slice expression at line 311 reaches the Go runtime bounds check, which panics.

  4. There is no defer recover() anywhere in the goroutine chain:

    The unrecovered panic propagates to Go's runtime, which calls os.Exit(2). The entire nats-server process terminates.

  5. The WebSocket frame is parsed in wsRead() called from readLoop(), which starts immediately after the HTTP upgrade — before any NATS CONNECT authentication. No credentials are required.

Why 15 bytes, not 14: The 14-byte frame header (opcode + length + mask key) exactly fills the read buffer on the first call, so pos == max and the payload loop at line 303 (if pos < max) is skipped. The poisoned r.rem persists…

Record
GHSA-pq2q-rcw4-3hr6
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-190
Updated
2026-11-02
NVD 7.5

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port. Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.

Record
CVE-2026-27889
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-190, CWE-1286
Updated
2026-11-02
OSV 7.5

NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port. Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.

Record
CVE-2026-27889
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-190
Updated
2026-11-02
OSVDEBIAN-CVE-2026-27889 7.5

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port. Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.

Record
DEBIAN-CVE-2026-27889
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
Show 8 moreShow less
OSVGHSA-pq2q-rcw4-3hr6 7.5

NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead

Background

NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.

When using WebSockets, a malicious client can trigger a server crash with crafted frames, before authentication.

Problem Description

A missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port.

Affected versions

Version 2 from v2.2.0 onwards, prior to v2.11.14 or v2.12.5

Workarounds

This only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If able to do so, a defense in depth of restricting either of these will mitigate the attack.

Solution

Upgrade the NATS server to a fixed version.

Credits

This was reported to the NATS maintainers by GitHub user Mistz1. Also independently reported by GitHub user jiayuqi7813.

Report by @Mistz1

Summary

An unauthenticated remote attacker can crash the entire nats-server process by sending a single malicious WebSocket frame (15 bytes after the HTTP upgrade handshake). The server fails to validate the RFC 6455 §5.2 requirement that the most significant bit of a 64-bit extended payload length must be zero. The resulting uint64 → int conversion produces a negative value, which bypasses the bounds clamp and triggers an unrecovered panic in the connection's goroutine — killing the entire server process and disconnecting all clients. This affects all platforms (64-bit and 32-bit).

Details

Vulnerable code: server/websocket.go line 278

r.rem = int(binary.BigEndian.Uint64(tmpBuf))

When a WebSocket frame uses the 64-bit extended payload length (length code 127), the server reads 8 bytes and casts the raw uint64 directly to int with no validation. RFC 6455 §5.2 states: "the most significant bit MUST be 0" — but nats-server never checks this.

Attack chain:

  1. The attacker sends a WebSocket frame with the MSB set in the 64-bit length field (e.g., 0x8000000000000001).

  2. At line 278, int(0x8000000000000001) produces -9223372036854775807 on 64-bit Go (two's complement reinterpretation — Go does not panic on integer conversion overflow).

  3. r.rem is now negative. At line 307–311, the bounds clamp fails:

    n = r.rem                    // n = -9223372036854775807
if pos+n > max {             // 14 + (-huge) = negative, NOT > max → FALSE
    n = max - pos            // clamp NEVER fires
}
b = buf[pos : pos+n]         // buf[14 : -9223372036854775793] → PANIC

    The addition pos + n wraps to a negative value (Go signed integer overflow is defined behavior — it wraps silently). Since the negative result is never greater than max, the clamp is skipped. The slice expression at line 311 reaches the Go runtime bounds check, which panics.

  4. There is no defer recover() anywhere in the goroutine chain:

    The unrecovered panic propagates to Go's runtime, which calls os.Exit(2). The entire nats-server process terminates.

  5. The WebSocket frame is parsed in wsRead() called from readLoop(), which starts immediately after the HTTP upgrade — before any NATS CONNECT authentication. No credentials are required.

Why 15 bytes, not 14: The 14-byte frame header (opcode + length + mask key) exactly fills the read buffer on the first call, so pos == max and the payload loop at line 303 (if pos < max) is skipped. The poisoned r.rem persists…

Record
GHSA-pq2q-rcw4-3hr6
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-190
Updated
2026-11-02
OSVJLSEC-2026-1121 7.5

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port. Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.

Record
JLSEC-2026-1121
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-GOBINARY-CVE-2026-27889 7.5

CVE-2026-27889 in rootio-github.com/nats-io/nats-server/v2 - Patched by Root

Root has patched CVE-2026-27889 in the rootio-github.com/nats-io/nats-server/v2 package for Root:Go. Multiple fixed versions available.

Record
ROOT-APP-GOBINARY-CVE-2026-27889
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
OSVUBUNTU-CVE-2026-27889 7.5

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port. Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.

Record
UBUNTU-CVE-2026-27889
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
OSVBIT-nats-2026-27889 No score

NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port. Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.

Record
BIT-nats-2026-27889
Updated
2026-11-02
OSVGO-2026-4841 No score

NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead in github.com/nats-io/nats-server

NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead in github.com/nats-io/nats-server

Record
GO-2026-4841
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02
OSVSUSE-SU-2026:1135-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

Update to version 0.0.20260326T203309 2026-03-26T20:33:09Z (jsc#PED-11136):

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4513 CVE-2026-32284
  • GO-2026-4514 CVE-2026-32285
  • GO-2026-4518 CVE-2026-32286
  • GO-2026-4526 CVE-2026-32287
  • GO-2026-4700 CVE-2026-32704 GHSA-4j3x-hhg2-fm2x
  • GO-2026-4701 CVE-2026-32720 GHSA-7x23-j8gv-v54x
  • GO-2026-4702 CVE-2026-32301 GHSA-j77h-rr39-c552
  • GO-2026-4703 GHSA-q926-c743-49qj
  • GO-2026-4704 CVE-2026-32606 GHSA-wj2j-qwcf-cfcc
  • GO-2026-4705 CVE-2026-32747 GHSA-h5vh-m7fg-w5h6
  • GO-2026-4706 CVE-2026-32751 GHSA-qr46-rcv3-4hq3
  • GO-2026-4707 CVE-2026-32749 GHSA-qvvf-q994-x79v
  • GO-2026-4708 CVE-2026-32750 GHSA-rjhh-m223-9qqv
  • GO-2026-4709 CVE-2026-32815 GHSA-xp2m-98x8-rpj6
  • GO-2026-4710 CVE-2026-32760 GHSA-5gg9-5g7w-hm73
  • GO-2026-4711 CVE-2026-32758 GHSA-9f3r-2vgw-m8xp
  • GO-2026-4712 CVE-2026-32771 GHSA-f7cq-gvh6-qr25
  • GO-2026-4713 CVE-2026-32759 GHSA-ffx7-75gc-jg7c
  • GO-2026-4714 CVE-2026-32737 GHSA-fgm3-q9r5-43v9
  • GO-2026-4715 CVE-2026-32769 GHSA-hxm7-9q36-c77f
  • GO-2026-4716 CVE-2026-32767 GHSA-j7wh-x834-p3r7
  • GO-2026-4717 CVE-2026-32828 GHSA-j94x-8wcp-x7hm
  • GO-2026-4718 CVE-2026-32768 GHSA-mw24-f3xh-j3qv
  • GO-2026-4719 CVE-2026-32805 GHSA-p799-g7vv-f279
  • GO-2026-4721 CVE-2026-32940 GHSA-4mx9-3c2h-hwhg
  • GO-2026-4722 CVE-2026-32938 GHSA-fq2j-j8hc-8vw8
  • GO-2026-4723 CVE-2026-32941 GHSA-97vp-pwqj-46qc
  • GO-2026-4724 CVE-2026-32254 GHSA-phqm-jgc3-qf8g
  • GO-2026-4725 CVE-2026-25783 GHSA-2v3w-6g35-5f9v
  • GO-2026-4726 CVE-2026-2456 GHSA-34g8-9fpp-46ch
  • GO-2026-4727 CVE-2026-26246 GHSA-44mv-jq72-gj49
  • GO-2026-4728 CVE-2026-32953 GHSA-4w7r-3222-8h6v
  • GO-2026-4729 CVE-2026-2458 GHSA-679f-wmrg-qf57
  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4731 CVE-2026-24458 GHSA-m5rv-56xx-hfc6
  • GO-2026-4732 CVE-2026-2457 GHSA-ph22-fw5m-w2q9
  • GO-2026-4733 CVE-2026-25780 GHSA-xv2p-wchj-qjhp
  • GO-2026-4734 CVE-2026-2578 GHSA-3rhr-jr63-hwq5
  • GO-2026-4735 CVE-2026-2463 GHSA-fx49-m253-27jj
  • GO-2026-4737 GHSA-594f-3595-c47v
  • GO-2026-4740 GHSA-h9q6-hc68-35rp
  • GO-2026-4742 CVE-2026-32811 GHSA-r8x2-fhmf-6mxp
  • GO-2026-4743 CVE-2026-33066 GHSA-4663-4mpg-879v
  • GO-2026-4744 CVE-2026-21386 GHSA-5mr9-crcg-8wh2
  • GO-2026-4745 CVE-2026-24692 GHSA-cwfj-642j-gfh4
  • GO-2026-4746 CVE-2026-2455 GHSA-gqv7-j2j8-qmwq
  • GO-2026-4747 CVE-2026-33067 GHSA-mvpm-v6q4-m2pf
  • GO-2026-4748 CVE-2026-33081 GHSA-qwxp-6qf9-wr4m
  • GO-2026-4749 CVE-2026-4265 GHSA-xpvf-6qcc-9jqc
  • GO-2026-4750 CVE-2026-32937 GHSA-6g43-577r-wf4x
  • GO-2026-4751 CVE-2026-33132 GHSA-g2pf-ww5m-2r9m
  • GO-2026-4752 CVE-2026-33203 GHSA-3g9h-9hp4-654v
  • GO-2026-4754 CVE-2026-33063 GHSA-4jrw-92fg-4jwx
  • GO-2026-4755 CVE-2026-33192 GHSA-5rvc-5cwx-g5x8
  • GO-2026-4756 CVE-2026-33062 GHSA-7c47-xr7q-p6hg
  • GO-2026-4757 CVE-2026-33064 GHSA-7g27-v5wj-jr75
  • GO-2026-4758 CVE-2026-33065 GHSA-958m-gxmc-mccm
  • GO-2026-4759 CVE-2026-33221 GHSA-g9f6-9775-hffm
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-4763 CVE-2026-33191 GHSA-p9hg-pq3q-v9gv
  • GO-2026-4765 GHSA-vccx-p757-pv6h
  • GO-2026-4766 CVE-2026-33194 GHSA-vm69-h85x-8p85
  • GO-2026-4768 CVE-2026-33320 GHSA-4fcp-jxh7-23x8
  • GO-2026-4769 CVE-2026-32691 GHSA-gfgr-6hrj-85ww
  • GO-2026-4770 GHSA-q382-vc8q-7jhj
  • GO-2026-4773 CVE-2026-33252 GHSA-89xv-2j6f-qhc8
  • GO-2026-4774 CVE-2026-30924 GHSA-h8vw-ph9r-xpch
  • GO-2026-4775 CVE-2026-30836 GHSA-q4r8-xm5f-56gw
  • GO-2026-4776 CVE-2026-33283 GHSA-3366-gw57-fcm5
  • GO-2026-4777 CVE-2026-32693 GHSA-439w-v2p7-pggc
  • GO-2026-4778 CVE-2026-32694 GHSA-5cj2-rqqf-hx9p
  • GO-2026-4779 CVE-2026-33322 GHSA-5cx5-wh4m-82fh
  • GO-2026-4780 CVE-2026-33282 GHSA-826q-wrq4-p23x
  • GO-2026-4781 CVE-2026-32692 GHSA-89x7-5m5m-mcmm
  • GO-2026-4782 CVE-2026-2461 GHSA-hf8w-x9h5-5gf9
  • GO-2026-4783 CVE-2026-33281 GHSA-q669-4gmv-g8mf
  • GO-2026-4784 CVE-2026-2476 GHSA-4ppj-6chv-5pgc
  • GO-2026-4785 CVE-2026-33344…
Record
SUSE-SU-2026:1135-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/nats-io/nats-server/v2
Go
 2.2.0 up to 2.11.14
2.11.14
github.com/nats-io/nats-server/v2
Go
 2.12.0 up to 2.12.5
2.12.5
github.com/nats-io/nats-server
Go
 Source text: > 0
Not evaluated
nats
Bitnami
 2.2.0 up to 2.11.14, 2.12.0 up to 2.12.5
2.11.142.12.5
nats-server
Debian:12
 All versions, plus listed versions
2.10.1-12.10.16-12.10.18-12.10.24-12.10.27-1
Show 10 moreShow less
2.10.3-12.10.4-12.10.7-12.12.4-12.12.6-12.14.1-12.14.3-12.14.6-12.9.10-12.9.19-1
 None known
nats-server
Debian:13
 All versions, plus listed versions
2.10.27-12.12.4-12.12.6-12.14.1-12.14.3-12.14.6-1
 None known
nats-server
Debian:14
 before 2.12.6-1, plus listed versions
2.10.27-12.12.4-1
2.12.6-1
github.com/nats-io/nats-server
Go
 All versions None known
github.com/nats-io/nats-server/v2
Go
 2.2.0 up to 2.11.14, 2.12.0 up to 2.12.5
2.11.142.12.5
nats_server_jll
Julia
 before 2.14.3+0
2.14.3+0
Show 8 moreShow less
Affected packages
PackageAffectedFixed
rootio-github.com/nats-io/nats-server/v2
Root:Go
 before v2.12.3-root.io.1
v2.12.3-root.io.1v2.12.3-root.io.2v2.12.3-root.io.3
github.com/nats-io/nats-server/v2
Root:Go
 before v2.12.3-aikido.3
v2.12.3-aikido.3
govulncheck-vulndb
openSUSE:Leap 15.6
From an advisory covering 138 CVEs
 before 0.0.20260326T203309-150000.1.155.2
0.0.20260326T203309-150000.1.155.2
nats-server
Ubuntu:24.04:LTS
 All versions, plus listed versions
2.9.19-1build12.10.3-12.10.4-12.10.7-12.10.7-1ubuntu0.12.10.7-1ubuntu0.22.10.7-1ubuntu0.3
 None known
nats-server
Ubuntu:25.10
 All versions, plus listed versions
2.10.24-12.10.27-1
 None known
nats-server
Ubuntu:26.10
 All versions, plus listed versions
2.10.27-1build12.14.1-12.14.3-1
 None known
nats-server
Ubuntu:Pro:26.04:LTS
 All versions, plus listed versions
2.10.27-12.10.27-1build12.10.27-1ubuntu0.26.04.1~esm1
 None known
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
 before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

Not evaluated means the source gave git commits or a range we can't read, so we can't tell which releases are affected. A fixed version beside it is the source’s own claim.

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-2026-27889 is a high vulnerability (CVSS 7.5) in Linuxfoundation Nats-server, published March 25, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.59%, the 48th percentile. Fixed in github.com/nats-io/nats-server/v2 2.11.14.

References

Show 194 moreShow less
This page doesn't list everything

Left out here: 1,550 references and the rest of 4 source descriptions. The JSON record has them.

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