What’s Vulnerable › Vulnerabilities

CVE-2026-116775: pageant: unbounded frame buffering on peer-controlled 4-byte length prefix (memory-exhaustion DoS)

• Severity: low (CVSS 2.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-27 · updated 2026-10-27
• Weakness: CWE-770

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.

Affected products

• Eugeny russh: from 0.2.0, < 0.2.5

References

• https://github.com/Eugeny/russh/commit/69e4b55513eaa8ac9d2ad4236f13171fc164e10a
• https://github.com/Eugeny/russh/releases/tag/v0.65.0
• https://github.com/Eugeny/russh/security/advisories/GHSA-662x-8wvj-2276

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