2.3

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

Deferred
AliasesGHSA-662x-8wvj-2276
Published 27-10-2026Last modified 03-11-2026

Vulnerability summary

CVE-2026-116775 is a low (CVSS 2.3) vulnerability in eugeny russh. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 22% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 2.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
2.3/10
010
Low · v4.0 (CVE.org)
EPSS score
0.29%
0%100%
Low · Change unavailable
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 27-10-2026
    PublishedVulnerability first disclosed.
  2. 03-11-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

22%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

28-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Crates.Io1 product
  • pageant≥ 0.2.0, < 0.2.5
Eugeny1 product

2 vendors · 2 products

References

5 links