CVE-2026-67293 FreeRDP before 3.29.0 Improper Certificate Hostname Validation
FreeRDP incorrectly validates TLS hostnames, allowing attackers to bypass certificate checks using wildcard certificates for multi-label subdomains.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-67293?
CVE-2026-67293 is a critical vulnerability in Freerdp Freerdp, published on 1 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-295
Which versions are affected by CVE-2026-67293?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-67293?
Upgrade to a fixed version.
Is CVE-2026-67293 being exploited?
There is no known exploitation of CVE-2026-67293 in the wild and no public exploit code.
Other vulnerabilities in Freerdp Freerdp
- CVE-2021-37594 Other in n/a
- CVE-2021-37595 Other in n/a
- CVE-2026-67305 FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr
- CVE-2026-66402 FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass
- CVE-2026-67289 FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection
Sources
Also known as DEBIAN-CVE-2026-67293, GHSA-5wr6-8m8j-3h7f, GHSA-wc6m-wggm-hjr8, OESA-2026-3641, OESA-2026-3642, OESA-2026-3643 and 2 more.