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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| libp2p | rust-yamux | >= 0.13.0, < 0.13.9 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | rust-yamux | 0.13.9+ds-1 | — |
| Debian 13 | rust-yamux | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | rust-yamux | No fix yet | — |
| Ubuntu 26.04 LTS | rust-yamux | No fix yet | — |
| Ubuntu 25.10 | rust-yamux | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| crates.io | yamux | >= 0.13.0, < 0.13.9 | 0.13.9 | GHSA-4w32-2493-32g7 |