HOMEVULNERABILITIESCVE-2026-3833
HIGH

CVE-2026-3833

CWE-178Published: April 30, 2026· Updated: May 7, 2026

7.4
CVSS v3.1
EPSS:0.03%probability of exploitation in 30 daysPercentile:8.6th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-3833 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 7.4.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected Vendors & Products

gnu1 product
gnutls
Red Hat3 products
hardened imagesopenshift container platformenterprise linux
Source: NVD CPE · 8 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://access.redhat.com/errata/RHSA-2026:13274
ADVISORYhttps://access.redhat.com/security/cve/CVE-2026-3833
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=2445763
ADVISORYhttps://gitlab.com/gnutls/gnutls/-/issues/1803
ADVISORYhttps://gitlab.com/gnutls/gnutls/-/issues/1803

All References (5)

→
https://access.redhat.com/errata/RHSA-2026:13274Issue Tracking · Third Party Advisory
→
https://access.redhat.com/security/cve/CVE-2026-3833Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2445763Issue Tracking · Third Party Advisory
→
https://gitlab.com/gnutls/gnutls/-/issues/1803Exploit · Issue Tracking · Vendor Advisory
→
https://gitlab.com/gnutls/gnutls/-/issues/1803Exploit · Issue Tracking · Vendor Advisory

Quick Facts

CVE IDCVE-2026-3833
CVSS Score7.4 / 10
SeverityHIGH
WeaknessCWE-178
CISA KEVNo
EPSS (30d)0.03%
Affected2 vendors
PublishedApr 30, 2026

Related CVEs (CWE-178)

CVE-2026-40453
9.9
CVE-2026-47323
9.8
CVE-2026-27588
9.1
CVE-2026-27587
9.1
CVE-2026-46392
8.7
CVE-2026-48595
8.2

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-3833 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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