[ CVE-2026-116775 · Published 27 Oct 2026 ]
pageant: unbounded frame buffering on peer-controlled 4-byte length prefix (memory-exhaustion DoS)
CVSS 2.3
EPSS <1%Fix available
[ Why it matters ]Priority signals
- Public proof-of-concept exploit exists (CISA SSVC)
[ Description ]Official description
pageant provides a PageantStream type that implements AsyncRead and AsyncWrite traits and can be used to communicate with a running Pageant instance. From 0.2.0 until 0.2.5, PageantStream::new in pageant/src/wmmessage.rs trusts a peer-controlled four-byte length prefix and buffers until len + 4 bytes are available without checking the fixed _AGENT_MAX_MSGLEN transport capacity. An application that bridges an SSH forwarded-agent channel to the raw stream can allow a malicious server to force large allocations or retain a partially filled frame, causing client memory exhaustion. This issue is fixed in version 0.2.5.
[ Fixes ]Fixes and patches
- pageant 0.2.5Fixed version · GitHub Advisories · rust package pageant: upgrade to 0.2.5 or later (affected >= 0.2.0, <= 0.2.4)
[ Packages ]Affected open-source packages
- pageant rustAffected >= 0.2.0, <= 0.2.4 · fixed in 0.2.5 · GHSA-662x-8wvj-2276