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CVE-2026-31814

Status: AnalyzedHigh (8.7)—

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.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Vector CVSS con AV:N/AC:L/PR:N/UI:N indica explotación remota sin autenticación (T1190). El overflow aritmético en la contabilidad de ventanas causa panic en la máquina de estado, resultando en DoS (T1499).

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Affected technologies (1)

Protocol — Yamux

CWEs

References

Raw JSON (NVD)

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  "published": "2026-03-13T19:54:36.470",
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  ],
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  "weaknesses": [
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      "description": [
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    }
  ],
  "lastModified": "2026-06-17T10:34:30.497",
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