CVE-2026-116775 Details
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.
A memory exhaustion vulnerability has been identified in the PageantStream type of the Russh SSH agent library, specifically in versions 0.2.0 through 0.2.4. The issue arises because PageantStream::new trusts a peer-controlled four-byte length prefix and buffers data without validating the length against the fixed maximum message length capacity. This flaw can be exploited by a malicious server to force large memory allocations or to retain a partially filled frame, leading to memory exhaustion on the client side.
Users can upgrade to Pageant version 0.2.5, which includes a fix that limits the message size by rejecting oversized frames before they are buffered.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 27, 2026CISA-ADP
Assessed Nov 3, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Eugeny/russh/security/advisories/GHSA-662x-8wvj-2276 | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/Eugeny/russh/commit/69e4b55513eaa8ac9d2ad4236f13171fc164e10a | [email protected] | Source CodeVendor |
| https://github.com/Eugeny/russh/releases/tag/v0.65.0 | [email protected] | Release NotesVendor |
| https://github.com/Eugeny/russh/security/advisories/GHSA-662x-8wvj-2276 | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Eugeny pageant | >= 0.2.0, <= 0.2.4 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 3, 2026 | CVE Modified | CISA-ADP |
| Oct 27, 2026 | New CVE Received | [email protected] |