CVE-2026-116775 pageant: unbounded frame buffering on peer-controlled 4-byte length prefix (memory-exhaustion DoS)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-116775?
CVE-2026-116775 is a low-severity vulnerability in Eugeny russh, published on 27 Oct 2026.
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.
Weakness: CWE-770
Which versions are affected by CVE-2026-116775?
How do I fix CVE-2026-116775?
No fix has been published for CVE-2026-116775 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-116775 being exploited?
There is no known exploitation of CVE-2026-116775 in the wild and no public exploit code.
Sources
Also known as GHSA-662x-8wvj-2276.