CVE-2026-3833

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Source
https://cve.org/CVERecord?id=CVE-2026-3833
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-3833.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-3833
Downstream
Related
Published
2026-04-30T17:37:05.818Z
Modified
2026-06-19T03:53:10.257790900Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
Summary
Gnutls: gnutls: policy bypass due to case-sensitive nameconstraints comparison
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.

Database specific 
{
    "cna_assigner": "redhat",
    "cwe_ids": [
        "CWE-178"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3833.json"
}
References

Affected packages

Git / gitlab.com/gnutls/gnutls

Affected ranges

Type
GIT
Repo
https://gitlab.com/gnutls/gnutls
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
b390d80208ed60f1b33ad899475951a8efb40ccd
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.8.13"
        }
    ]
}

Affected versions

3.*
3.6.12
3.6.13
3.6.14
3.7.0
3.7.1
3.7.2
3.7.3
3.7.4
3.7.5
3.7.7
3.7.8
3.8.0
3.8.1
3.8.10
3.8.11
3.8.12
3.8.2
3.8.3
3.8.4
3.8.5
3.8.6
3.8.7
3.8.8
3.8.9
Other
gnutls-0-0-7
gnutls-0-1-0-srp
gnutls-0_1_2
gnutls-3_0_12
gnutls0-0-4
gnutls0-0-5
gnutls0-0-6
gnutls_0_1_4
gnutls_0_1_9
gnutls_0_2_0
gnutls_0_2_1
gnutls_0_2_10
gnutls_0_2_11
gnutls_0_2_2
gnutls_0_2_3
gnutls_0_2_4
gnutls_0_2_9
gnutls_0_2_90
gnutls_0_2_91
gnutls_0_3_0
gnutls_0_3_1
gnutls_0_3_2
gnutls_0_3_90
gnutls_0_3_91
gnutls_0_3_92
gnutls_0_4_0
gnutls_0_4_1
gnutls_0_4_2
gnutls_0_4_3
gnutls_0_4_with_libtasn1
gnutls_0_5_0
gnutls_0_5_1
gnutls_0_5_10
gnutls_0_5_11
gnutls_0_5_4
gnutls_0_5_5
gnutls_0_5_6
gnutls_0_5_7
gnutls_0_5_8
gnutls_0_5_9
gnutls_0_5_x_before_export_ciphersuites
gnutls_0_5_x_before_int_fixes
gnutls_0_5_x_before_types_change
gnutls_0_5_x_with_export_ciphersuites
gnutls_0_6_0
gnutls_0_8_0
gnutls_0_8_1
gnutls_0_9_1
gnutls_0_9_2
gnutls_0_9_3
gnutls_0_9_4
gnutls_0_9_5
gnutls_0_9_6
gnutls_0_9_7
gnutls_0_9_8
gnutls_0_9_90
gnutls_0_9_91
gnutls_0_9_92
gnutls_0_9_93
gnutls_0_9_94
gnutls_0_9_95
gnutls_0_9_96
gnutls_0_9_97
gnutls_0_9_98
gnutls_0_9_99
gnutls_1_0_0
gnutls_1_0_20
gnutls_1_0_21
gnutls_1_0_22
gnutls_1_0_23
gnutls_1_0_24
gnutls_1_0_25
gnutls_1_1_0
gnutls_1_1_1
gnutls_1_1_10
gnutls_1_1_11
gnutls_1_1_12
gnutls_1_1_13
gnutls_1_1_14
gnutls_1_1_15
gnutls_1_1_16
gnutls_1_1_17
gnutls_1_1_18
gnutls_1_1_19
gnutls_1_1_2
gnutls_1_1_20
gnutls_1_1_21
gnutls_1_1_22
gnutls_1_1_23
gnutls_1_1_3
gnutls_1_1_4
gnutls_1_1_5
gnutls_1_1_6
gnutls_1_1_7
gnutls_1_1_7_pre0
gnutls_1_1_8
gnutls_1_1_9
gnutls_1_2_0
gnutls_1_2_1
gnutls_1_2_10
gnutls_1_2_11
gnutls_1_2_2
gnutls_1_2_3
gnutls_1_2_4
gnutls_1_2_5
gnutls_1_2_6
gnutls_1_2_7
gnutls_1_2_8
gnutls_1_2_9
gnutls_1_3_0
gnutls_1_3_1
gnutls_1_3_2
gnutls_1_3_3
gnutls_1_3_4
gnutls_1_3_5
gnutls_1_4_0
gnutls_1_4_1
gnutls_1_4_2
gnutls_1_5_0
gnutls_1_5_1
gnutls_1_5_2
gnutls_1_5_3
gnutls_1_5_4
gnutls_1_5_5
gnutls_1_6_0
gnutls_1_6_1
gnutls_1_7_0
gnutls_1_7_1
gnutls_1_7_10
gnutls_1_7_11
gnutls_1_7_12
gnutls_1_7_13
gnutls_1_7_14
gnutls_1_7_15
gnutls_1_7_16
gnutls_1_7_17
gnutls_1_7_18
gnutls_1_7_19
gnutls_1_7_2
gnutls_1_7_3
gnutls_1_7_4
gnutls_1_7_5
gnutls_1_7_6
gnutls_1_7_7
gnutls_1_7_8
gnutls_1_7_9
gnutls_2_0_0
gnutls_2_0_1
gnutls_2_11_3
gnutls_2_11_4
gnutls_2_11_5
gnutls_2_11_6
gnutls_2_1_0
gnutls_2_1_1
gnutls_2_1_2
gnutls_2_1_3
gnutls_2_1_4
gnutls_2_1_5
gnutls_2_1_6
gnutls_2_1_7
gnutls_2_1_8
gnutls_2_3_0
gnutls_2_3_1
gnutls_2_3_10
gnutls_2_3_11
gnutls_2_3_12
gnutls_2_3_13
gnutls_2_3_14
gnutls_2_3_15
gnutls_2_3_3
gnutls_2_3_5
gnutls_2_3_6
gnutls_2_3_7
gnutls_2_3_8
gnutls_2_3_9
gnutls_2_4_0
gnutls_2_5_0
gnutls_2_5_1
gnutls_2_5_2
gnutls_2_5_3
gnutls_2_5_4
gnutls_2_5_6
gnutls_2_5_7
gnutls_2_5_8
gnutls_2_7_0
gnutls_2_7_1
gnutls_2_7_10
gnutls_2_7_11
gnutls_2_7_12
gnutls_2_7_3
gnutls_2_7_4
gnutls_2_7_5
gnutls_2_7_6
gnutls_2_7_7
gnutls_2_7_8
gnutls_2_7_9
gnutls_2_99_0
gnutls_2_99_1
gnutls_2_99_2
gnutls_2_99_3
gnutls_2_99_4
gnutls_2_9_10
gnutls_2_9_2
gnutls_2_9_3
gnutls_2_9_4
gnutls_2_9_5
gnutls_2_9_6
gnutls_2_9_7
gnutls_2_9_8
gnutls_2_9_9
gnutls_3_0_0
gnutls_3_0_10
gnutls_3_0_11
gnutls_3_0_13
gnutls_3_0_14
gnutls_3_0_15
gnutls_3_0_16
gnutls_3_0_17
gnutls_3_0_18
gnutls_3_0_2
gnutls_3_0_21
gnutls_3_0_3
gnutls_3_0_4
gnutls_3_0_5
gnutls_3_0_6
gnutls_3_0_7
gnutls_3_0_8
gnutls_3_0_9
gnutls_3_1_0
gnutls_3_1_0pre0
gnutls_3_1_2
gnutls_3_1_3
gnutls_3_1_4
gnutls_3_1_5
gnutls_3_1_6
gnutls_3_1_7
gnutls_3_1_8
gnutls_3_1_9
gnutls_3_2_0
gnutls_3_2_2
gnutls_3_2_3
gnutls_3_2_3pre0
gnutls_3_2_4
gnutls_3_2_5
gnutls_3_2_6
gnutls_3_3_0
gnutls_3_3_1
gnutls_3_3_2
gnutls_3_3_3
gnutls_3_3_4
gnutls_3_3_5
gnutls_3_3_6
gnutls_3_4_0
gnutls_3_4_1
gnutls_3_4_2
gnutls_3_4_3
gnutls_3_5_0
gnutls_3_5_1
gnutls_3_5_2
gnutls_3_5_3
gnutls_3_5_4
gnutls_3_5_5
gnutls_3_5_7
gnutls_3_6_0
gnutls_3_6_0_1
gnutls_3_6_1
gnutls_3_6_10
gnutls_3_6_11
gnutls_3_6_11_1
gnutls_3_6_12
gnutls_3_6_2
gnutls_3_6_3
gnutls_3_6_4
gnutls_3_6_5
gnutls_3_6_6
gnutls_3_6_7
gnutls_3_6_9

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-3833.json"