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Details of issue NIXPKGS-2026-0761

NIXPKGS-2026-0761
published 3 months ago
Permalink CVE-2026-27889
7.5 HIGH
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): None (N)
  • Integrity (I): None (N)
  • Availability (A): High (H)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): None (N)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): None (N)
  • Modified Availability (MA): High (H)
updated 2 months, 4 weeks ago by @LeSuisse Activity log
  • Created suggestion 3 months ago
  • @LeSuisse accepted 2 months, 4 weeks ago
  • @LeSuisse published on GitHub 2 months, 4 weeks ago
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.

Affected products

nats-server
  • ==>= 2.12.0, < 2.12.5
  • ==>= 2.2.0, < 2.11.14

Matching in nixpkgs

Package maintainers

Upstream advisory: https://github.com/nats-io/nats-server/security/advisories/GHSA-pq2q-rcw4-3hr6