GHSA-f26w-gh5m-qq77
Pion Interceptor's improper RTP padding handling allows remote crash for SFU users (DoS)
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | github.com/pion/interceptor | >= 0.1.36, < 0.1.39 | 0.1.39 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
Pion Interceptor versions v0.1.36 through v0.1.38 contain a bug in a RTP packet factory that can be exploited to trigger a panic with Pion based SFU via crafted RTP packets, This only affect users that use pion/interceptor.
### Patches
Upgrade to v0.1.39 or later, which includes PR [#338](https://github.com/pion/interceptor/pull/338) which validates that: `padLen > 0 && padLen <= payloadLength` and return error on overflow, avoiding panic.
If upgrading is not possible, apply the patch from the pull request manually or drop packets whose P-bit is set but whose padLen is zero or larger than the remaining payload.
### Workarounds
At the application layer, reject any RTP packet where:
```
hasPadding (P-bit field) == true && (padLen == 0 || padLen > packetLen – headerLen)
```
before passing it to Pion’s packet factories.
### References
Commit fixing the bug: https://github.com/pion/interceptor/commit/fa5b35ea867389cec33a9c82fffbd459ca8958e5
Pull request: https://github.com/pion/interceptor/pull/338
Issue: https://github.com/pion/webrtc/issues/3148
References
External links from the advisory. They lead to third-party sites.
- https://github.com/pion/interceptor/security/advisories/GHSA-f26w-gh5m-qq77
- https://nvd.nist.gov/vuln/detail/CVE-2025-49140
- https://github.com/pion/webrtc/issues/3148
- https://github.com/pion/interceptor/pull/338
- https://github.com/pion/interceptor/commit/fa5b35ea867389cec33a9c82fffbd459ca8958e5
- https://github.com/pion/interceptor