DEBIAN-CVE-2026-43994
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-43994
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43994.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-43994
- Upstream
- Published
- 2026-06-18T21:16:28Z
- Modified
- 2026-09-14T17:03:13Z
- Severity
-
- 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
Coturn is a free open source implementation of TURN and STUN Server. Versions prior to 4.10.0 contain a stack buffer overflow in decode_oauth_token_gcm(). A uint16_t nonce_len field read from an attacker-supplied OAuth access token (0-65535) is passed directly to memcpy() as the copy length into a 256-byte stack buffer (oauth_encrypted_block.nonce[256]) without bounds checking. The overflow occurs before AES-GCM authentication is verified, the attacker does not need to know the OAuth key or produce a valid AES-GCM token. Up to 735 bytes of attacker-controlled data are written past the buffer, may corrupt adjacent stack data, including control-flow data depending on compiler, ABI, and mitigations. Requires --oauth mode (non-default). This may provide a plausible RCE primitive depending on exploit mitigations; because coturn is widely deployed for WebRTC TURN/STUN and --oauth is commonly recommended, impact can be broad. This issue has been fixed in version 4.10.0.
- References
Affected packages
Debian:12 / coturn
Package
- Name
- coturn
- Purl
- pkg:deb/debian/coturn?arch=source&distro=bookworm
Debian:13 / coturn
Package
- Name
- coturn
- Purl
- pkg:deb/debian/coturn?arch=source&distro=trixie