CVE-2026-32314: libp2p rust-yamux Uncaught Exception
Vulnerability summary
CVE-2026-32314 is a high (CVSS 8.7) Uncaught Exception vulnerability in libp2p rust-yamux. EPSS estimates a 0.60% chance of exploitation in the next 30 days, higher than 47.4% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 13-03-2026PublishedVulnerability first disclosed.
- 16-03-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
7 scores · 5 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated8.7HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- OSV · Crates.ioEcosystem advisory · calculated8.7HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- NVDNIST8.7HighCVSS: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
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.60%
Chance of exploitation in the next 30 days
Percentile
47%
Versus all other CVEs
30-day change
+0.14 pp
From 0.45% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundRust Yamux
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Crates.Io1 product
- yamux< 0.13.10
Debian1 product
- rust-yamuxAll versions (No fix recorded) | < 0.13.10+ds-1
Libp2p1 product
- rust-yamux< 0.13.10
Protocol1 product
- yamux< 0.13.10
Ubuntu1 product
- rust-yamuxAll versions (No fix recorded)
5 vendors · 5 products
References
6 links- github.com/libp2p/rust-yamux/security/advisories/GHSA-vxx9-2994-q338X Refsource CONFIRMREPORTWEBExploitVendor Advisory
- github.com/libp2p/rust-yamuxPACKAGE