by Kastro
Paper/Archive/CVE-2026-67293

CVE-2026-67293

FreeRDP FreeRDP — FreeRDP before 3.29.0 Improper Certificate Hostname Validation

EPSS 0.2%CVSS 9.3
critical.is priorityof 100
31
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 14.8.148 × 203.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
FreeRDP< 3.29.03.29.0CNA

Scores by source

VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
VulnCheck (CNA)4.2CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

advisorygithub.com/FreeRDP/FreeRDP/security/advisories/GHSA-5wr6-8m8j-3h7fpatchgithub.com/FreeRDP/FreeRDP/commit/f3b4347105114fe7453828736bea069999af319fwriteupvulncheck.com/advisories/freerdp-before-improper-certificate-hostname-validation