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CVE-2026-31814

Protocol Yamux integer overflow

7.5 HIGHPublic exploitEPSS 0.60%
  1. Published13 Mar 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Protocol Yamux≥ 0.13.0 < 0.13.9

Remediation

Fixed in
Protocol Yamux≥ 0.13.9

References

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Frequently asked

Is CVE-2026-31814 being actively exploited?

CVE-2026-31814 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.60%.

How severe is CVE-2026-31814?

CVE-2026-31814 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.60% probability of exploitation.

Which products are affected by CVE-2026-31814?

Affected products include Protocol Yamux.

How do I fix CVE-2026-31814?

Upgrade affected software to a fixed version, for example Protocol Yamux 0.13.9 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-31814 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.