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-2026-42010

CVE-2026-42010CRITICAL

Gnutls: gnutls: authentication bypass via nul character in username

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  H  H    9.8   .0094   59.7     —

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 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
  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support  unspecified  0:3.6.16-5.el8_6.5
  + 42 more

TIMELINE
  Apr 23  Reserved by redhat
  May 7   Published (CNA: redhat)
  Jul 23  RESCORED — CVE-2026-42010 (Red Hat Enterprise Linux 10). CVSS 7.1 → 9.8 (NVD).

CWE-170, CWE-626 · CNA: redhat · CVSS v3.1 · 34 references · NVD status: Modified

Description

A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 23, 2026	Reserved	Reserved by redhat
May 7, 2026	Published	Published (CNA: redhat)
July 23, 2026	RESCORED	RESCORED — CVE-2026-42010 (Red Hat Enterprise Linux 10). CVSS 7.1 → 9.8 (NVD).

Affected

Affected products and packages — 52 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 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	—	—	416.94.202608150307-0
Red Hat	Red Hat OpenShift Container Platform 4.17	—	—	417.94.202608250221-0
Red Hat	Red Hat OpenShift Container Platform 4.18	—	—	418.94.202608142238-0
Red Hat	Red Hat OpenShift Container Platform 4.19	—	—	4.19.9.6.202607151909-0
Red Hat	Red Hat OpenShift Container Platform 4.20	—	—	4.20.9.6.202607010620-0
Red Hat	Red Hat OpenShift Container Platform 4.21	—	—	4.21.9.6.202607011303-0
Red Hat	Red Hat OpenShift Container Platform 4.22	—	—	4.22.9.8.202606301732-0
Red Hat	Cert Manager support for Red Hat OpenShift release 1.20	—	—	1790598593
Red Hat	Red Hat AI Inference Server 3.2	—	—	1782951051
Red Hat	Red Hat AI Inference Server 3.2	—	—	1782951012
Red Hat	Red Hat AI Inference Server 3.2	—	—	1782951244
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 Enterprise Linux 7	—	—	—
Red Hat	Red Hat OpenShift Container Platform 4	—	—	—
Red Hat	Red Hat OpenShift Container Platform 4	—	—	—

Weaknesses

CWE-170 · CWE-626

References (34)

Authoritative record: CVE-2026-42010 at cve.org

Vendors: red hat

Weaknesses: CWE-170 · CWE-626

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-42010 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.