Vulnerability · Published Aug 1, 2026 · Assigned by VulnCheck

CVE-2026-67293FreeRDP before 3.29.0 Improper Certificate Hostname Validation

Medium 4.2

In plain English

A medium-severity improper certificate validation in FreeRDP from FreeRDP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.2Medium

Exploit odds (30 days)0.2%top 85.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains an improper certificate hostname validation vulnerability. The TLS hostname matcher (tls_match_hostname() in libfreerdp/crypto/tls.c) treats a wildcard pattern such as *.example.com as matching any hostname ending in .example.com, so it incorrectly accepts a wildcard certificate for multi-label subdomains like a.b.example.com (which OpenSSL's X509_check_host() rejects). This weakens TLS server authentication under wildcard-certificate conditions.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	freerdp2	no fix listed	DEBIAN-CVE-2026-67293
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-67293
Debian:14	freerdp3	3.29.0+dfsg-1	DEBIAN-CVE-2026-67293
Ubuntu:22.04:LTS	freerdp2	no fix listed	UBUNTU-CVE-2026-67293
Ubuntu:24.04:LTS	freerdp3	3.30.0+dfsg-0ubuntu0.24.04.1	UBUNTU-CVE-2026-67293
Ubuntu:26.04:LTS	freerdp3	3.30.0+dfsg-0ubuntu0.26.04.1	UBUNTU-CVE-2026-67293

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	0 – before 3.29.0

Weakness: CWE-295 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-5wr6-8m8j-3h7f) vendor-advisory
Patch Commit patch
VulnCheck Advisory: FreeRDP before 3.29.0 Improper Certificate Hostname Validation third-party-advisory