PT-2026-25360 · Debian+5 · Rust-Yamux+1

Revofusion · Published 2026-01-01 · Updated 2026-03-13 · CVE-2026-31814

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Yamux versions 0.13.0 through 0.13.8

Description Yamux is a stream multiplexer used over reliable, ordered connections like TCP/IP. A specially crafted WindowUpdate can lead to an arithmetic overflow in the send-window accounting, causing a panic in the connection state machine. This is remotely exploitable over a network connection without authentication. The issue involves accepting WindowUpdate credit values from a remote peer and applying them to per-stream send-window state. An attacker can establish a Yamux session and crash the target by sending a sequence of frames: opening a stream and then sending a WindowUpdate with a large credit value that overflows a u32 integer. This results in a remote, unauthenticated denial of service.

Recommendations Upgrade to Yamux version 0.13.9.

Exploit

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2026-31814

GHSA-4W32-2493-32G7

Affected Products

Rust-Yamux

Yamux

References · 15

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31814.json · Exploit
• https://github.com/libp2p/rust-yamux/security/advisories/GHSA-4w32-2493-32g7 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-31814 · Security Note
• https://osv.dev/vulnerability/GHSA-4w32-2493-32g7 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-31814 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-31814 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31814 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-31814 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31814 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31814 · Vendor Advisory
• https://github.com/libp2p/rust-yamux/commit/b1aae09d60c0bd6a5915a5448f4e8cbc5174db53 · Note
• https://github.com/libp2p/rust-yamux/releases/tag/yamux-v0.13.9 · Note
• https://github.com/libp2p/rust-yamux/pull/221 · Note
• https://github.com/libp2p/rust-yamux · Note
• https://twitter.com/CVEnew/status/2032605890621182030 · Twitter Post