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Untriaged
Permalink CVE-2026-5132
6.5 MEDIUM
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): Low (L)
  • 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): Low (L)
  • 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)
created 1 week ago Activity log
  • Created suggestion 1 week ago
Unbounded zlib decompression in Calls SDP WebSocket messages

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to limit size of unpacked SDP messages compressed with zlib, which allows attacker to deny service or crash server via sending many SDP messages that unpack to large size.. Mattermost Advisory ID: MMSA-2026-00643

References

Affected products

Mattermost
  • =<11.9.0
  • =<10.11.22
  • =<11.8.4
  • ==11.10.0
  • ==11.9.1
  • =<11.7.7
  • ==10.11.23
  • ==11.8.5
  • ==11.7.8

Matching in nixpkgs

pkgs.mattermost

Open source platform for secure collaboration across the entire software development lifecycle

  • nixos-unstable -
  • nixos-26.05 -

pkgs.mattermostLatest

Open source platform for secure collaboration across the entire software development lifecycle

  • nixos-unstable -
  • nixos-26.05 -

Package maintainers