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CVE-2026-33869
NixOS vulnerability analysis and mitigation

Mastodon is a free, open-source social network server based on ActivityPub. In versions on the 4.5.x branch prior to 4.5.8 and on the 4.4.x branch prior to 4.4.15, an attacker that knows of a quote before it has reached a server can prevent it from being correctly processed on that server. The vulnerability has been patched in Mastodon 4.5.8 and 4.4.15. Mastodon 4.3 and earlier are not affected because they do not support quotes.


SourceNVD

Related NixOS vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-2370HIGH8.8
  • GitLabGitLab
  • gitlab
NoYesMar 30, 2026
CVE-2026-33206HIGH8.2
  • NixOSNixOS
  • calibre
NoYesMar 27, 2026
CVE-2026-33868MEDIUM6.1
  • NixOSNixOS
  • mastodon
NoYesMar 27, 2026
CVE-2026-33869MEDIUM4.8
  • NixOSNixOS
  • cpe:2.3:a:joinmastodon:mastodon
NoYesMar 27, 2026
CVE-2026-33205MEDIUM4.8
  • NixOSNixOS
  • cpe:2.3:a:calibre-ebook:calibre
NoYesMar 27, 2026

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