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Hardened ImagesApplication · Redhat

CVE-2026-3833

HIGH · 7.4 CVSS v3.1 Published 2026-04-30
No fix yet
No fix has been published. The vendor has not shipped a fixed release or patch. You remain exposed.
See remediation →
83/100
Remediation priority · High
Public exploit Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Hardened ImagesApplication
Affected:all versions
Openshift Container PlatformApplication
Affected:= 4.0
Enterprise LinuxOperating system
Affected:= 6.0= 7.0= 8.0= 9.0= 10.0
GnutlsApplication
Affected:all versions

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Recommended fix Moderate confidence

Apply latest Red Hat Security Advisory (RHSA) for gnutls - check access.redhat.com for the specific RHSA number for this CVE

  1. 1. Check the current gnutls version installed: `rpm -q gnutls` or `gnutls-cli --version`
  2. 2. Apply the latest security patches for gnutls via your system package manager: For RHEL/CentOS use `yum update gnutls` or `dnf update gnutls`
  3. 3. For Enterprise Linux 6/7/8/9, ensure you have the latest errata applied: `yum update` or `dnf update`
  4. 4. For OpenShift Container Platform 4.0, apply the latest platform updates which include gnutls security fixes
  5. 5. After updating, verify the fix by checking that gnutls now performs case-insensitive comparisons for nameConstraints by testing with certificates that have differing case in SAN entries
  6. 6. Restart any services using gnutls (like httpd, postfix, etc.) to load the updated library
Caveat Updating gnutls may cause compatibility issues with older applications that depend on the previous (incorrect) case-sensitive behavior; test in staging first

Generated from the published advisory — verify against the referenced sources before acting.

No vendor fix exists Hardened Images has not published a patch for this.

There is no version to upgrade to and no patch to apply. Every affected install stays exposed until the vendor ships a fix — or somebody else builds one.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-3833 in production — separate from our analysis above.

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