Vulnerability · Published Oct 14, 2026 · Assigned by VulnCheck

CVE-2026-110717Janus WebRTC Server through 1.4.3 Path Traversal via Record&Play Filename

Medium 5.3

In plain English

A medium-severity path traversal in janus-gateway from meetecho. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.5%top 59.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Janus WebRTC Server through 1.4.3 contains a path traversal vulnerability in the Record&Play plugin that allows unauthenticated attackers to write files outside recordings_path via the record request filename. Attackers can supply filenames with path separators to create or truncate files ending in -audio.mjr, -video.mjr or -data.mjr anywhere the Janus process can write outside protected folders.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	janus	no fix listed	DEBIAN-CVE-2026-110717
Debian:14	janus	no fix listed	DEBIAN-CVE-2026-110717
Ubuntu:22.04:LTS	janus	no fix listed	UBUNTU-CVE-2026-110717
Ubuntu:24.04:LTS	janus	no fix listed	UBUNTU-CVE-2026-110717
Ubuntu:26.04:LTS	janus	no fix listed	UBUNTU-CVE-2026-110717
Ubuntu:26.10	janus	no fix listed	UBUNTU-CVE-2026-110717

Affected products (as reported)

Vendor	Product	Versions
meetecho	janus-gateway	0 – through 1.4.3

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/HkEaF-piGl technical-description, exploit
https://github.com/meetecho/janus-gateway/blob/1f0b75cac1c9ad819ee4c2a905a2c65b00b82cde/src/plugins/janus_recordplay.c#L1965 technical-description
https://github.com/meetecho/janus-gateway/blob/1f0b75cac1c9ad819ee4c2a905a2c65b00b82cde/src/record.c#L218 technical-description
https://github.com/meetecho/janus-gateway product
VulnCheck Advisory: Janus WebRTC Server through 1.4.3 Path Traversal via Record&Play Filename third-party-advisory