Riskcovery

CVE-2026-42010

Gnutls: gnutls: authentication bypass via nul character in username

State
Published
Severity
7.1 High
Published
May 7, 2026
Updated
Oct 30, 2026
Reserved
Apr 23, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:Nredhat
3.17.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:Nredhat-SADP

Weaknesses

  • CWE-170 Improper Null Termination
  • CWE-626 Null Byte Interaction Error (Poison Null Byte)

Affected Products

ProductVersions
gnutls
  • 3.6.13 to before 3.8.13Affected
Red Hat Enterprise Linux 10Red Hat
  • 0:3.8.10-4.el10_2 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat
  • 0:3.8.9-9.el10_0.19 and laterNot affected
Red Hat Enterprise Linux 8Red Hat
  • 0:3.6.16-8.el8_10.6 and laterNot affected
Red Hat Enterprise Linux 8Red Hat
  • 0:3.6.16-8.el8_10.6 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat
  • 0:3.6.14-10.el8_4.1 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat
  • 0:4.13-3.el8_4.1 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat
  • 0:3.6.14-10.el8_4.1 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat
  • 0:4.13-3.el8_4.1 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat
  • 0:3.6.16-5.el8_6.5 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat
  • 0:4.13-3.el8_6.2 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat
  • 0:3.6.16-5.el8_6.5 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat
  • 0:4.13-3.el8_6.2 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat
  • 0:3.6.16-7.el8_8.4 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat
  • 0:4.13-4.el8_8.1 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat
  • 0:3.6.16-7.el8_8.4 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat
  • 0:4.13-4.el8_8.1 and laterNot affected
Red Hat Enterprise Linux 9Red Hat
  • 0:3.8.10-4.el9_8 and laterNot affected
Red Hat Enterprise Linux 9Red Hat
  • 0:3.8.10-4.el9_8 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat
  • 0:3.7.6-21.el9_2.7 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat
  • 0:3.8.3-4.el9_4.6 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat
  • 0:3.8.3-6.el9_6.4 and laterNot affected
Red Hat OpenShift Container Platform 4.12Red Hat
  • 412.86.202608241157-0 and laterNot affected
Red Hat OpenShift Container Platform 4.13Red Hat
  • 413.92.202609080414-0 and laterNot affected
Red Hat OpenShift Container Platform 4.14Red Hat
  • 414.92.202609011250-0 and laterNot affected
Red Hat OpenShift Container Platform 4.15Red Hat
  • 415.92.202609140326-0 and laterNot affected
Red Hat OpenShift Container Platform 4.16Red Hat
  • 416.94.202608150307-0 and laterNot affected
Red Hat OpenShift Container Platform 4.17Red Hat
  • 417.94.202608250221-0 and laterNot affected
Red Hat OpenShift Container Platform 4.18Red Hat
  • 418.94.202608142238-0 and laterNot affected
Red Hat OpenShift Container Platform 4.19Red Hat
  • 4.19.9.6.202607151909-0 and laterNot affected
Red Hat OpenShift Container Platform 4.20Red Hat
  • 4.20.9.6.202607010620-0 and laterNot affected
Red Hat OpenShift Container Platform 4.21Red Hat
  • 4.21.9.6.202607011303-0 and laterNot affected
Red Hat OpenShift Container Platform 4.22Red Hat
  • 4.22.9.8.202606301732-0 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.17Red Hat
  • 1791371080 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.17Red Hat
  • 1791371069 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.17Red Hat
  • 1791788287 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.17Red Hat
  • 1791970484 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat
  • 1791459707 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat
  • 1791459711 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat
  • 1791459759 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat
  • 1789029076 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat
  • 1791966259 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.20Red Hat
  • 1790598593 and laterNot affected
Red Hat AI Inference Server 3.2Red Hat
  • 1782951051 and laterNot affected
Red Hat AI Inference Server 3.2Red Hat
  • 1782951012 and laterNot affected
Red Hat AI Inference Server 3.2Red Hat
  • 1782951244 and laterNot affected
Red Hat Discovery 2Red Hat
  • 1782159791 and laterNot affected
Red Hat Discovery 2Red Hat
  • 1782166952 and laterNot affected
Red Hat Hardened ImagesRed Hat
  • 3.8.13-1.hum1 and laterNot affected
Red Hat OpenShift AI 3.4Red Hat
  • 1790703542 and laterNot affected
Red Hat Update Infrastructure 5Red Hat
  • 1781525684 and laterNot affected
Red Hat Update Infrastructure 5Red Hat
  • 1781525671 and laterNot affected
Red Hat Update Infrastructure 5Red Hat
  • 1781525693 and laterNot affected
Red Hat Update Infrastructure 5Red Hat
  • 1781525739 and laterNot affected
Red Hat Update Infrastructure 5Red Hat
  • 1787241211 and laterNot affected
Red Hat Update Infrastructure 5Red Hat
  • 1787135742 and laterNot affected
Red Hat Update Infrastructure 5Red Hat
  • 1787241260 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
    Red Hat Enterprise Linux 7Red Hat
      Red Hat OpenShift Container Platform 4Red Hat
        Red Hat OpenShift Container Platform 5Red Hat

          References

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