boxscore/security
CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

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   .0056   44.4     —
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
  + 23 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).
CWE-178 · CNA: redhat · CVSS v3.1 · 17 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 — 4 events, chronological
DateEventDetail
March 9, 2026ReservedReserved by redhat
April 30, 2026PublishedPublished (CNA: redhat)
July 22, 2026EXPLOIT PUBLISHEDEXPLOIT PUBLISHED — CVE-2026-3833 (gnutls). Public exploit reference added.
July 22, 2026RESCOREDRESCORED — CVE-2026-3833 (gnutls). CVSS 6.5 → 7.4 (NVD).

Affected

Affected products and packages — 33 rows
VendorProduct / PackageEcosystemVersion introducedFixed
—gnutls———
Red HatRed Hat Enterprise Linux 10——0:3.8.10-4.el10_2
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support——0:3.8.9-9.el10_0.19
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support——0:3.3.29-9.el7_9.2
Red HatRed Hat Enterprise Linux 8——0:3.6.16-8.el8_10.6
Red HatRed Hat Enterprise Linux 8——0:3.6.16-8.el8_10.6
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support——0:3.6.14-10.el8_4.1
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support——0:4.13-3.el8_4.1
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On——0:3.6.14-10.el8_4.1
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On——0:4.13-3.el8_4.1
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support——0:3.6.16-5.el8_6.5
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support——0:4.13-3.el8_6.2
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On——0:3.6.16-5.el8_6.5
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On——0:4.13-3.el8_6.2
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service——0:3.6.16-7.el8_8.4
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service——0:4.13-4.el8_8.1
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions——0:3.6.16-7.el8_8.4
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions——0:4.13-4.el8_8.1
Red HatRed Hat Enterprise Linux 9——0:3.8.10-4.el9_8
Red HatRed Hat Enterprise Linux 9——0:3.8.10-4.el9_8
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions——0:3.7.6-21.el9_2.7
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions——0:3.8.3-4.el9_4.6
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support——0:3.8.3-6.el9_6.4
Red HatRed Hat Discovery 2——1782159791
Red HatRed Hat Discovery 2——1782166952
Red HatRed Hat Hardened Images——3.8.13-1.hum1
Red HatRed Hat Update Infrastructure 5——1781525684
Red HatRed Hat Update Infrastructure 5——1781525671
Red HatRed Hat Update Infrastructure 5——1781525693
Red HatRed Hat Update Infrastructure 5——1781525739
Red HatRed Hat Enterprise Linux 6———
Red HatRed Hat OpenShift Container Platform 4———
Red HatRed Hat OpenShift Container Platform 4———

Weaknesses

CWE-178

References (17)

Related

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 Wednesday, August 19, 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.