CVE-2026-3833Medium· 6.5▾ TwilightPoC availableA flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of `nameConstraints` labels, specifically for `dNSName` (DNS) or `rfc822Name` (email) constraints within `excludedSubtrees` or `perm…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 35.8 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Aug 1.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.6%
Exploit / PoC code exists
0.6% → 0.9%
Last analysed / modified upstream
A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of nameConstraints labels, specifically for dNSName (DNS) or rfc822Name (email) constraints within excludedSubtrees or permittedSubtrees. A remote attacker can exploit this by crafting a leaf certificate with casing differences in the Subject Alternative Name (SAN), leading to a policy bypass where a certificate that should be rejected is instead accepted. This could result in unauthorized access or information disclosure.
gnutlshardened_imagesopenshift_container_platform = 4.0enterprise_linux = 6.0enterprise_linux = 7.0enterprise_linux = 8.0enterprise_linux = 9.0enterprise_linux = 10.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-3832Low· 3.7A flaw was found in gnutls
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CVE-2026-5260High· 8.2A flaw was found in libgnutls
CVE-2026-42015Medium· 5.3A flaw was found in gnutls
CVE-2026-42013High· 8.2A flaw was found in gnutls