Read the docs
TI-2026-24367 Aliases CVE-2026-31814GHSA-4w32-2493-32g7

Yamux remote Panic via malformed WindowUpdate credit

Priority MEDIUM 40CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-190 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00481 41st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed rust-yamux (libp2p): 0.13.9yamux (crates.io): 0.13.9

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
libp2prust-yamux0.13.0 to before 0.13.90.13.9Patch availableCNA
—yamux (crates.io)0.13.0 to before 0.13.90.13.9Patch availableGHSA-4w32-2493-32g7
  • rust-yamux Vendorlibp2p Affected 0.13.0 to before 0.13.9 Fixed in 0.13.9 Patch available CNA
  • yamux (crates.io) Vendor— Affected 0.13.0 to before 0.13.9 Fixed in 0.13.9 Patch available GHSA-4w32-2493-32g7

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:protocol:yamux:*:*:*:*:*:rust:*:*0.13.0 to before 0.13.9VulnerableProtocol
  • cpe:2.3:a:protocol:yamux:*:*:*:*:*:rust:*:* Versions 0.13.0 to before 0.13.9 Vulnerable ·Protocol

Remediation

  • Fix · CNA rust-yamux (libp2p) Fixed in 0.13.9
  • Fix · GHSA-4w32-2493-32g7 yamux (crates.io) Fixed in 0.13.9 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-31814
  2. 2026-10-03 Alias added: GHSA-4w32-2493-32g7

References

Exploit 1

Advisory 1

Other 4

  • TI-2026-60386 libp2p-rendezvous through 0.17.1 Denial of Service via Unbounded Registration TTL in Discovery Responses CVSS 4.0HIGH 8.7
  • TI-2026-58865 libp2p: PeerStore accepts attacker-signed PeerRecords for a victim peer ID and stores certified attacker addresses CVSS 3.1HIGH 8.2
  • TI-2026-44102 libp2p-quic: Remote panic via certificate expiry race during QUIC handshake CVSS 4.0HIGH 8.2
  • TI-2026-27587 libp2p-rust has unbounded rendezvous DISCOVER cookies enable remote memory exhaustion CVSS 3.1HIGH 8.2
  • TI-2026-58864 libp2p: Gossipsub StrictSign accepts attacker-signed messages as a victim RSA peer ID CVSS 3.1HIGH 7.5
  • TI-2026-53982 libp2p: Circuit relay v2 server reservation refresh leaks abort listeners and allows remote resource exhaustion CVSS 3.1HIGH 7.5
See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences