CVE-2026-116775
pageant: unbounded frame buffering on peer-controlled 4-byte length prefix (memory-exhaustion DoS)
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 and workarounds
Fix
pageant (crates.io): OSV reports a fixed version 0.2.5. Check the advisory for supported release branches.
Source: OSV GHSA-662x-8wvj-2276Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| russh Eugeny |
>= 0.2.0, < 0.2.5 (affected) | CNA: GitHub_M |
pageantpageant
crates.io |
≥ 0.2.0; < 0.2.5 (affected, semver); OSV events: introduced 0.2.0; fixed 0.2.5Source events (semver)Other versions: unaffected |
OSV GHSA-662x-8wvj-2276 |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 2.3 low |
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | CNA: GitHub_M |
Exploit evidence
- https://github.com/Eugeny/russh/security/advisories/GHSA-662x-8wvj-2276
exploit · ADP: CISA-ADP
References
- https://github.com/Eugeny/russh/security/advisories/GHSA-662x-8wvj-2276CNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/Eugeny/russh/commit/69e4b55513eaa8ac9d2ad4236f13171fc164e10aCNA: GitHub_M · x_refsource_MISC
- https://github.com/Eugeny/russh/releases/tag/v0.65.0CNA: GitHub_M · x_refsource_MISC
- https://github.com/Eugeny/russh/security/advisories/GHSA-662x-8wvj-2276ADP: CISA-ADP · exploit
- https://github.com/advisories/GHSA-662x-8wvj-2276OSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-662x-8wvj-2276OSV / GitHub Security Advisories · osv
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