CVE-2026-32314 json
Yamux remote Panic via malformed Data frame with SYN set and len = 262145
published 2026-03-13 7 mo ago modified 2026-06-17 4 mo ago also GHSA-vxx9-2994-q338 , EUVD-2026-12095
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 44%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- crates.io yamux 0.13.10
- protocol yamux 0.13.10
- rust-yamux Debian 14 0.13.10+ds-1
debian advisories DEBIAN-CVE-2026-32314
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/libp2p/rust-yamux/security/advisories/GHSA-vxx9-2994-q338 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | yamux | <0.13.10 |
0.13.10 |
Affected products
- libp2p rust-yamux
Classification
References
-
github.com
/libp2p/rust-yamux/security/advisories/GHSA-vxx9-2994-q338
web, exploit, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-32314
advisory
-
github.com
/libp2p/rust-yamux
package
Sources
- CVE List CVE-2026-32314
- GitHub Advisory GHSA-vxx9-2994-q338
- NVD CVE-2026-32314
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