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CVE-2026-3833

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Summary

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 unaut

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.

CVSS Score
6.5
Medium
EPSS Score
0.1
Exploit Probability
Published Date
2026-04-30
First Seen: 2026-05-03
📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 47.9% of all 322,079 vulnerabilities in our database.

#167,935
Below average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: Apr 30, 2026
🔍 Exploitation Status
Poc
Proof-of-concept available
⚙️ Automatable
YES
Can be exploited automatically
💥 Technical Impact
Partial
Limited system impact
SSVC data provided by CISA
Last Modified 2026-05-07
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE IDs (Weakness Types)
CWE-178

📦 Affected Products 7

Vendor Product Status Affected Versions
gnu gnutls Affected
v-
redhat enterprise_linux Affected
v10.0
redhat enterprise_linux Affected
v6.0
redhat enterprise_linux Affected
v7.0
redhat enterprise_linux Affected
v8.0
redhat enterprise_linux Affected
v9.0
redhat openshift_container_platform Affected
v4.0

🔗 References 4

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

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-42010 ⚠️ high 7.1 0.2 A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully ma... 2026-05-07
CVE-2026-34000 🔶 medium 6.1 0.0 A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifical... 2026-05-05
CVE-2026-34002 🔶 medium 6.1 0.0 A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension... 2026-05-05
CVE-2026-33845 ⚠️ high 7.5 0.0 A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an i... 2026-04-30
CVE-2026-3832 ℹ️ low 3.7 0.0 A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted Online ... 2026-04-30
CVE-2026-7309 🔶 medium 4.3 0.0 A flaw was found in the OpenShift Container Platform build system. A user with the `edit` ClusterRole can inject arbitra... 2026-04-28
These CVEs affect the same products