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CVE-2026-32314: Yamux vulnerable to remote Panic via malformed Data frame with SYN set and len = 262145

March 13, 2026 (updated March 16, 2026)

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. kind of vulnerability is it? Who is

References

  • github.com/advisories/GHSA-vxx9-2994-q338
  • github.com/libp2p/rust-yamux
  • github.com/libp2p/rust-yamux/security/advisories/GHSA-vxx9-2994-q338
  • nvd.nist.gov/vuln/detail/CVE-2026-32314

Code Behaviors & Features

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Affected versions

All versions before 0.13.10

Fixed versions

  • 0.13.10

Solution

Upgrade to version 0.13.10 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Learn more about CVSS

Weakness

  • CWE-248: Uncaught Exception
  • CWE-617: Reachable Assertion

Source file

cargo/yamux/CVE-2026-32314.yml

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