DEBIAN-CVE-2026-3833

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Source
https://security-tracker.debian.org/tracker/CVE-2026-3833
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-3833.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-3833
Upstream
Published
2026-04-30T18:16:30Z
Modified
2026-09-18T08:47:27Z
Severity
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:12 / gnutls28

Package

Name
gnutls28
Purl
pkg:deb/debian/gnutls28?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.7.9-2+deb12u7

Affected versions

3.*
3.7.9-2
3.7.9-2+deb12u1
3.7.9-2+deb12u2
3.7.9-2+deb12u3
3.7.9-2+deb12u4
3.7.9-2+deb12u5
3.7.9-2+deb12u6

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-3833.json"

Debian:13 / gnutls28

Package

Name
gnutls28
Purl
pkg:deb/debian/gnutls28?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.8.9-3+deb13u4

Affected versions

3.*
3.8.9-3
3.8.9-3+deb13u1
3.8.9-3+deb13u2
3.8.9-3+deb13u3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-3833.json"

Debian:14 / gnutls28

Package

Name
gnutls28
Purl
pkg:deb/debian/gnutls28?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.8.13-1

Affected versions

3.*
3.8.9-3
3.8.10-1
3.8.10-2
3.8.10-3
3.8.11-1
3.8.11-2
3.8.11-3
3.8.12-1
3.8.12-2
3.8.12-3
3.8.12-4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-3833.json"