How severe is CVE-2026-32314?

CVE-2026-32314 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-32314 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-32314?

CVE-2026-32314 affects Protocol Yamux. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-32314?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-32314 have an EU (EUVD) identifier?

Yes. CVE-2026-32314 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12095.

When was CVE-2026-32314 published?

CVE-2026-32314 was published on 2026-03-16 and last updated on 2026-06-17.

CVE-2026-32314

CVE-2026-32314 is a high-severity vulnerability in Protocol Yamux with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-248.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12095
Weakness: CWE-248
Affected product: Protocol Yamux
Published: 2026-03-16
Last modified: 2026-06-17

Description

Yamux is a stream multiplexer over reliable, ordered connections such as TCP/IP. Prior to 0.13.10, the Rust implementation of Yamux can panic when processing a crafted inbound Data frame that sets SYN and uses a body length greater than DEFAULT_CREDIT (e.g. 262145). On the first packet of a new inbound stream, stream state is created and a receiver is queued before oversized-body validation completes. When validation fails, the temporary stream is dropped and cleanup may call remove(...).expect("stream not found"), triggering a panic in the connection state machine. This is remotely reachable over a normal Yamux session and does not require authentication. This vulnerability is fixed in 0.13.10.

Frequently asked questions

What is CVE-2026-32314?: Yamux is a stream multiplexer over reliable, ordered connections such as TCP/IP. Prior to 0.13.10, the Rust implementation of Yamux can panic when processing a crafted inbound Data frame that sets SYN and uses a body length greater than DEFAULT_CREDIT (e.g. 262145). On the first packet of a new inbound stream, stream state is created and a receiver is queued before oversized-body validation completes. When validation fails, the temporary stream is dropped and cleanup may call remove(...).expect("stream not found"), triggering a panic in the connection state machine. This is remotely reachable over a normal Yamux session and does not require authentication. This vulnerability is fixed in 0.13.10.
How severe is CVE-2026-32314?: CVE-2026-32314 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-32314 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-32314?: CVE-2026-32314 affects Protocol Yamux. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-32314?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-32314 have an EU (EUVD) identifier?: Yes. CVE-2026-32314 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12095.
When was CVE-2026-32314 published?: CVE-2026-32314 was published on 2026-03-16 and last updated on 2026-06-17.

References

https://github.com/libp2p/rust-yamux/security/advisories/GHSA-vxx9-2994-q338

Affected products (1)

cpe:2.3:a:protocol:yamux:*:*:*:*:*:rust:*:*

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