Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-3833

CVE-2026-3833HIGH

Gnutls: gnutls: policy bypass due to case-sensitive nameconstraints comparison

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   N   N  U  H  H  N    7.4   .0089   58.1     —

AFFECTED
  Product                                                                Versions     Fixed
  gnutls                                                                 unspecified  —
  Red Hat Enterprise Linux 10                                            unspecified  0:3.8.10-4.el10_2
  Red Hat Enterprise Linux 10.0 Extended Update Support                  unspecified  0:3.8.9-9.el10_0.19
  Red Hat Enterprise Linux 7 Extended Lifecycle Support                  unspecified  0:3.3.29-9.el7_9.2
  Red Hat Enterprise Linux 8                                             unspecified  0:3.6.16-8.el8_10.6
  Red Hat Enterprise Linux 8                                             unspecified  0:3.6.16-8.el8_10.6
  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support  unspecified  0:3.6.14-10.el8_4.1
  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support  unspecified  0:4.13-3.el8_4.1
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On  unspecified  0:3.6.14-10.el8_4.1
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On  unspecified  0:4.13-3.el8_4.1
  + 36 more

TIMELINE
  Mar 9   Reserved by redhat
  Apr 30  Published (CNA: redhat)
  Jul 22  EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
  Jul 22  RESCORED — CVE-2026-3833 (gnutls). CVSS 6.5 → 7.4 (NVD).
  Aug 24  EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
  Aug 25  EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
  Aug 26  EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
  Aug 31  EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
  Sep 1   EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
  Sep 3   EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
  Sep 10  EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
  Sep 14  EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
  Sep 17  EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
  Sep 29  EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
  Oct 2   EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.

CWE-178 · CNA: redhat · CVSS v3.1 · 28 references · NVD status: Modified

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.

Lifecycle

Complete event history — 15 events, chronological
Date	Event	Detail
March 9, 2026	Reserved	Reserved by redhat
April 30, 2026	Published	Published (CNA: redhat)
July 22, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
July 22, 2026	RESCORED	RESCORED — CVE-2026-3833 (gnutls). CVSS 6.5 → 7.4 (NVD).
August 24, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
August 25, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
August 26, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
August 31, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
September 1, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
September 3, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
September 10, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
September 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
September 17, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
September 29, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
October 2, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.

Affected

Affected products and packages — 46 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
—	gnutls	—	—	—
Red Hat	Red Hat Enterprise Linux 10	—	—	0:3.8.10-4.el10_2
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	—	—	0:3.8.9-9.el10_0.19
Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	—	—	0:3.3.29-9.el7_9.2
Red Hat	Red Hat Enterprise Linux 8	—	—	0:3.6.16-8.el8_10.6
Red Hat	Red Hat Enterprise Linux 8	—	—	0:3.6.16-8.el8_10.6
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	—	—	0:3.6.14-10.el8_4.1
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	—	—	0:4.13-3.el8_4.1
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	—	—	0:3.6.14-10.el8_4.1
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	—	—	0:4.13-3.el8_4.1
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	—	—	0:3.6.16-5.el8_6.5
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	—	—	0:4.13-3.el8_6.2
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	—	—	0:3.6.16-5.el8_6.5
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	—	—	0:4.13-3.el8_6.2
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	—	—	0:3.6.16-7.el8_8.4
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	—	—	0:4.13-4.el8_8.1
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	—	—	0:3.6.16-7.el8_8.4
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	—	—	0:4.13-4.el8_8.1
Red Hat	Red Hat Enterprise Linux 9	—	—	0:3.8.10-4.el9_8
Red Hat	Red Hat Enterprise Linux 9	—	—	0:3.8.10-4.el9_8
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	—	—	0:3.7.6-21.el9_2.7
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	—	—	0:3.8.3-4.el9_4.6
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	—	—	0:3.8.3-6.el9_6.4
Red Hat	Red Hat OpenShift Container Platform 4.12	—	—	412.86.202608241157-0
Red Hat	Red Hat OpenShift Container Platform 4.13	—	—	413.92.202609080414-0
Red Hat	Red Hat OpenShift Container Platform 4.14	—	—	414.92.202609011250-0
Red Hat	Red Hat OpenShift Container Platform 4.15	—	—	415.92.202609140326-0
Red Hat	Red Hat OpenShift Container Platform 4.16	—	—	416.94.202609011112-0
Red Hat	Red Hat OpenShift Container Platform 4.17	—	—	417.94.202608250221-0
Red Hat	Red Hat OpenShift Container Platform 4.18	—	—	418.94.202609031320-0
Red Hat	Red Hat OpenShift Container Platform 4.19	—	—	4.19.9.6.202608182320-0
Red Hat	Cert Manager support for Red Hat OpenShift release 1.20	—	—	1790598593
Red Hat	Red Hat Discovery 2	—	—	1782159791
Red Hat	Red Hat Discovery 2	—	—	1782166952
Red Hat	Red Hat Hardened Images	—	—	3.8.13-1.hum1
Red Hat	Red Hat OpenShift AI 3.4	—	—	1790703542
Red Hat	Red Hat Update Infrastructure 5	—	—	1781525684
Red Hat	Red Hat Update Infrastructure 5	—	—	1781525671
Red Hat	Red Hat Update Infrastructure 5	—	—	1781525693
Red Hat	Red Hat Update Infrastructure 5	—	—	1781525739
Red Hat	Red Hat Update Infrastructure 5	—	—	1787241211
Red Hat	Red Hat Update Infrastructure 5	—	—	1787135742
Red Hat	Red Hat Update Infrastructure 5	—	—	1787241260
Red Hat	Red Hat Enterprise Linux 6	—	—	—
Red Hat	Red Hat OpenShift Container Platform 4	—	—	—
Red Hat	Red Hat OpenShift Container Platform 4	—	—	—

Weaknesses

CWE-178

References (28)

Authoritative record: CVE-2026-3833 at cve.org

Vendors: red hat

Weaknesses: CWE-178

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-3833 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.