CVE-2026-31814

Yamux remote Panic via malformed WindowUpdate credit

State: Published
Severity: 8.7 High
Published: Mar 13, 2026
Updated: Mar 13, 2026
Reserved: Mar 9, 2026

Description

Yamux is a stream multiplexer over reliable, ordered connections such as TCP/IP. From 0.13.0 to before 0.13.9, a specially crafted WindowUpdate can cause arithmetic overflow in send-window accounting, which triggers a panic in the connection state machine. This is remotely reachable over a normal network connection and does not require authentication. This vulnerability is fixed in 0.13.9.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
rust-yamuxlibp2p	>= 0.13.0, < 0.13.9Affected

References

https://github.com/libp2p/rust-yamux/security/advisories/GHSA-4w32-2493-32g7

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