GnuTLS: Mehrere Schwachstellen

Summary

Product

Vulnerabilities 13

• High 8.2
  CVE-2026-42013

  Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name

  A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certi…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 6 Linux Debian Ubuntu Azure Linux Alpine
  May 26, 2026
• High 8.2
  CVE-2026-5260

  Gnutls: gnutls: information disclosure via heap overread in rsa key exchange

  A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA key backed by a PKCS#11 token, could trigger a short heap overread. This memory corruption vulnerability could…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 7 Linux Debian Ubuntu Azure Linux Alpine
  May 26, 2026
• High 7.5
  CVE-2026-33845

  Gnutls: gnutls: denial of service via dtls zero-length fragment

  A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow during reassembly and resulting in an out-of-bounds read. This issue is remotely exploitable and may cause information dis…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 6 Linux Debian Ubuntu Azure Linux Alpine
  Apr 30, 2026
• High 7.5
  CVE-2026-33846

  Gnutls: gnutls: denial of service via heap buffer overflow in dtls handshake fragment reassembly

  A heap buffer overflow vulnerability exists in the DTLS handshake fragment reassembly logic of GnuTLS. The issue arises in merge_handshake_packet() where incoming handshake fragments are matched and merged based solely on handshake type, without validating th…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 6 Linux Debian Ubuntu Azure Linux Alpine
  May 4, 2026
• High 7.5
  CVE-2026-42009

  Gnutls: gnutls: denial of service via dtls packet reordering vulnerability

  A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. The comparator function, responsible for ordering DTLS packets by sequence numbers, did not correctly handle packets …

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 6 Linux Debian Ubuntu Azure Linux Alpine
  May 18, 2026
• High 7.4
  CVE-2026-42011

  Gnutls: gnutls: security bypass due to incorrect name constraint handling

  A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name cons…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 6 Linux Debian Ubuntu Alpine
  May 7, 2026
• High 7.1
  CVE-2026-42010

  Gnutls: gnutls: authentication bypass via nul character in username

  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…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 7 Linux Debian Ubuntu Azure Linux Alpine
  May 7, 2026
• High 7.1
  CVE-2026-42012

  Gnutls: gnutls: certificate validation bypass due to improper handling of uri and srv sans

  A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate va…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 10 Linux Debian Ubuntu Azure Linux Alpine
  May 26, 2026
• Medium 6.6
  CVE-2026-42014

  Gnutls: gnutls: use-after-free in gnutls_pkcs11_token_set_pin

  A flaw was found in GnuTLS. The `gnutls_pkcs11_token_set_pin` function, used for changing the Security Officer PIN, can lead to a use-after-free vulnerability. This occurs when an attacker attempts to change the PIN with a NULL old PIN for a token that lacks …

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 6 Linux Debian Ubuntu Azure Linux Alpine
  Jun 16, 2026
• Medium 6.5
  CVE-2026-3833

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

  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 remo…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 6 Linux Debian Ubuntu Alpine
  Apr 30, 2026
• Medium 5.3
  CVE-2026-42015

  Gnutls: gnutls: memory corruption due to off-by-one error in pkcs#12 bag handling

  A flaw was found in gnutls. An off-by-one error exists in the PKCS#12 bag element bounds check. This vulnerability allows an remote attacker to write past the internal array of a PKCS#12 bag when appending to a bag that already contains 32 elements. This memo…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 6 Linux Debian Ubuntu Azure Linux Alpine
  May 26, 2026
• Low 3.7
  CVE-2026-3832

  Gnutls: gnutls: security bypass allows acceptance of revoked server certificates via crafted ocsp response

  A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted Online Certificate Status Protocol (OCSP) response during a TLS handshake. Due to a logic error in how gnutls processes multi-record OCSP response…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 7 Linux Debian Ubuntu Azure Linux Alpine
  Apr 30, 2026
• Low 3.7
  CVE-2026-5419

  Gnutls: gnutls: information disclosure via timing side-channel in pkcs#7 padding removal

  A flaw was found in gnutls. The PKCS#7 padding check, performed during decryption, was not constant-time. This timing side-channel could allow a remote attacker to potentially leak sensitive information about the padding bytes through observable timing differ…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 7 Linux Debian Ubuntu Azure Linux Alpine
  Jun 1, 2026

Revision history

1. 2026-11-10 #61

   Neue Updates von Red Hat aufgenommen

2. 2026-11-09 #60

   Neue Updates von Red Hat aufgenommen

3. 2026-11-02 #59

   Neue Updates von Red Hat aufgenommen

4. 2026-10-27 #58

   Neue Updates von Red Hat aufgenommen

5. 2026-10-26 #57

   Neue Updates von Red Hat aufgenommen

6. 2026-10-22 #56

   Neue Updates von Red Hat aufgenommen

7. 2026-10-15 #55

   Neue Updates von Red Hat aufgenommen

8. 2026-10-14 #54

   Neue Updates von Red Hat aufgenommen

9. 2026-10-13 #53

   Neue Updates von NetApp aufgenommen

10. 2026-09-27 #52

    Neue Updates von Red Hat aufgenommen

11. 2026-09-23 #51

    Neue Updates von F5 aufgenommen

12. 2026-09-21 #50

    Neue Updates von F5 aufgenommen

13. 2026-09-17 #49

    Neue Updates von Red Hat aufgenommen

14. 2026-09-16 #48

    Neue Updates von Red Hat aufgenommen

15. 2026-09-14 #47

    Neue Updates von Red Hat aufgenommen

16. 2026-09-09 #46

    Neue Updates von Red Hat aufgenommen

17. 2026-09-03 #45

    Neue Updates von Red Hat und Dell aufgenommen

18. 2026-09-02 #44

    Neue Updates von Red Hat aufgenommen

19. 2026-08-31 #43

    Neue Updates von Dell aufgenommen

20. 2026-08-30 #42

    Neue Updates von Red Hat aufgenommen

21. 2026-08-26 #41

    Neue Updates von Red Hat aufgenommen

22. 2026-08-11 #40

    Neue Updates von Oracle Linux aufgenommen

23. 2026-08-09 #39

    Neue Updates von Oracle Linux aufgenommen

24. 2026-07-26 #38

    Neue Updates von NetApp aufgenommen

25. 2026-07-22 #37

    Neue Updates von Red Hat aufgenommen

References

• GnuTLS Security Advisories vom 2026-04-29
  https://gnutls.org/security-new.html
• Mailing list OSS-Security vom 2026-04-29
  https://seclists.org/oss-sec/2026/q2/288
• Red Hat Security Advisory RHSA-2026:13274 vom 2026-05-03
  https://access.redhat.com/errata/RHSA-2026:13274
• openSUSE Security Update OPENSUSE-SU-2026:10691-1 vom 2026-05-07
  https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/OVIQ4J6D4X3DFRGJX5NN75GR6ETDFNGJ/
• Microsoft Security Update Guide vom 2026-05-12
  https://msrc.microsoft.com/update-guide/
• Debian Security Advisory DSA-6281 vom 2026-05-20
  https://security-tracker.debian.org/tracker/DSA-6281-1
• Ubuntu Security Notice USN-8284-1 vom 2026-05-20
  https://ubuntu.com/security/notices/USN-8284-1
• openSUSE Security Update OPENSUSE-SU-2026:20778-1 vom 2026-05-25
  https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/DYFLUAKIHHEN26Q4ZE3GU2JAT3JQUZSQ/
• Debian Security Advisory DLA-4595 vom 2026-05-22
  https://lists.debian.org/debian-lts-announce/2026/05/msg00040.html
• SUSE Security Update SUSE-SU-2026:21752-1 vom 2026-05-26
  https://lists.suse.com/pipermail/sle-security-updates/2026-May/026306.html
• Red Hat Security Advisory RHSA-2026:20611 vom 2026-05-27
  https://access.redhat.com/errata/RHSA-2026:20611
• SUSE Security Update SUSE-SU-2026:21815-1 vom 2026-05-27
  https://lists.suse.com/pipermail/sle-security-updates/2026-May/026330.html
• SUSE Security Update SUSE-SU-2026:2087-1 vom 2026-05-27
  https://lists.suse.com/pipermail/sle-security-updates/2026-May/026367.html
• SUSE Security Update SUSE-SU-2026:21784-1 vom 2026-05-27
  https://lists.suse.com/pipermail/sle-security-updates/2026-May/026356.html
• Rocky Linux Security Advisory RLSA-2026:20611 vom 2026-05-29
  https://errata.build.resf.org/RLSA-2026:20611
• SUSE Security Update SUSE-SU-2026:2115-1 vom 2026-05-29
  https://lists.suse.com/pipermail/sle-security-updates/2026-May/026394.html
• SUSE Security Update SUSE-SU-2026:21867-1 vom 2026-06-02
  https://lists.suse.com/pipermail/sle-security-updates/2026-June/026523.html
• Rocky Linux Security Advisory RLSA-2026:20612 vom 2026-06-02
  https://errata.build.resf.org/RLSA-2026:20612
• Oracle Linux Security Advisory ELSA-2026-20611 vom 2026-06-03
  https://linux.oracle.com/errata/ELSA-2026-20611.html
• Rocky Linux Security Advisory RLSA-2026:20613 vom 2026-06-05
  https://errata.build.resf.org/RLSA-2026:20613
• Amazon Linux Security Advisory ALAS2-2026-3324 vom 2026-06-09
  https://alas.aws.amazon.com/AL2/ALAS2-2026-3324.html
• Microsoft Security Update Guide vom 2026-06-09
  https://msrc.microsoft.com/update-guide/
• SUSE Security Update SUSE-SU-2026:2366-1 vom 2026-06-11
  https://lists.suse.com/pipermail/sle-security-updates/2026-June/026704.html
• SUSE Security Update SUSE-SU-2026:2367-1 vom 2026-06-11
  https://lists.suse.com/pipermail/sle-security-updates/2026-June/026703.html
• Red Hat Security Advisory RHSA-2026:26409 vom 2026-06-16
  https://access.redhat.com/errata/RHSA-2026:26409
• Red Hat Security Advisory RHSA-2026:26319 vom 2026-06-16
  https://access.redhat.com/errata/RHSA-2026:26319
• IBM Security Bulletin 7277096 vom 2026-06-19
  https://www.ibm.com/support/pages/node/7277096
• Red Hat Security Advisory RHSA-2026:28010 vom 2026-06-22
  https://access.redhat.com/errata/RHSA-2026:28010
• Red Hat Security Advisory RHSA-2026:29197 vom 2026-06-24
  https://access.redhat.com/errata/RHSA-2026:29197
• Red Hat Security Advisory RHSA-2026:30004 vom 2026-06-26
  https://access.redhat.com/errata/RHSA-2026:30004
• Oracle Linux Security Advisory ELSA-2026-20612 vom 2026-06-27
  http://linux.oracle.com/errata/ELSA-2026-20612.html
• Oracle Linux Security Advisory ELSA-2026-50346 vom 2026-06-29
  https://linux.oracle.com/errata/ELSA-2026-50346.html
• Red Hat Security Advisory RHSA-2026:33125 vom 2026-06-29
  https://access.redhat.com/errata/RHSA-2026:33125
• Red Hat Security Advisory RHSA-2026:29794 vom 2026-06-30
  https://access.redhat.com/errata/RHSA-2026:29794
• Red Hat Security Advisory RHSA-2026:36006 vom 2026-07-06
  https://access.redhat.com/errata/RHSA-2026:36006
• Red Hat Security Advisory RHSA-2026:36004 vom 2026-07-06
  https://access.redhat.com/errata/RHSA-2026:36004
• Ubuntu Security Notice USN-8502-1 vom 2026-07-06
  https://ubuntu.com/security/notices/USN-8502-1
• Red Hat Security Advisory RHSA-2026:34790 vom 2026-07-07
  https://access.redhat.com/errata/RHSA-2026:34790
• Red Hat Security Advisory RHSA-2026:34764 vom 2026-07-07
  https://access.redhat.com/errata/RHSA-2026:34764
• Red Hat Security Advisory RHSA-2026:34788 vom 2026-07-07
  https://access.redhat.com/errata/RHSA-2026:34788
• SUSE Security Update SUSE-SU-2026:2822-1 vom 2026-07-10
  https://lists.suse.com/pipermail/sle-security-updates/2026-July/027352.html
• SUSE Security Update SUSE-SU-2026:2924-1 vom 2026-07-14
  https://lists.suse.com/pipermail/sle-security-updates/2026-July/027428.html
• SUSE Security Update SUSE-SU-2026:2923-1 vom 2026-07-14
  https://lists.suse.com/pipermail/sle-security-updates/2026-July/027429.html
• Ubuntu Security Notice USN-8539-1 vom 2026-07-14
  https://ubuntu.com/security/notices/USN-8539-1
• SUSE Security Update SUSE-SU-2026:3042-1 vom 2026-07-15
  https://lists.suse.com/pipermail/sle-security-updates/2026-July/027508.html
• Red Hat Security Advisory RHSA-2026:41921 vom 2026-07-20
  https://access.redhat.com/errata/RHSA-2026:41921
• Oracle Linux Security Advisory ELSA-2026-20613 vom 2026-07-21
  https://linux.oracle.com/errata/ELSA-2026-20613.html
• Red Hat Security Advisory RHSA-2026:43575 vom 2026-07-22
  https://access.redhat.com/errata/RHSA-2026:43575
• Red Hat Security Advisory RHSA-2026:40762 vom 2026-07-22
  https://access.redhat.com/errata/RHSA-2026:40762
• NetApp Security Advisory NTAP-20260724-0002 vom 2026-07-24
  https://security.netapp.com/advisory/NTAP-20260724-0002
• Oracle Linux Security Advisory ELSA-2026-34372 vom 2026-08-07
  http://linux.oracle.com/errata/ELSA-2026-34372.html
• Oracle Linux Security Advisory ELSA-2026-43575 vom 2026-08-12
  https://linux.oracle.com/errata/ELSA-2026-43575.html
• Red Hat Security Advisory RHSA-2026:57483 vom 2026-08-26
  https://access.redhat.com/errata/RHSA-2026:57483
• Red Hat Security Advisory RHSA-2026:57402 vom 2026-08-26
  https://access.redhat.com/errata/RHSA-2026:57402
• Red Hat Security Advisory RHSA-2026:56911 vom 2026-08-31
  https://access.redhat.com/errata/RHSA-2026:56911
• Red Hat Security Advisory RHSA-2026:56853 vom 2026-08-31
  https://access.redhat.com/errata/RHSA-2026:56853
• Dell Security Advisory DSA-2026-386 vom 2026-09-01
  https://www.dell.com/support/kbdoc/000503504/dsa-2026-386-security-update-f
• Red Hat Security Advisory RHSA-2026:60019 vom 2026-09-03
  https://access.redhat.com/errata/RHSA-2026:60019
• Red Hat Security Advisory RHSA-2026:59831 vom 2026-09-03
  https://access.redhat.com/errata/RHSA-2026:59831
• Dell Security Advisory DSA-2026-313 vom 2026-09-04
  https://www.dell.com/support/kbdoc/de-de/000505510/dsa-2026-313-security-update-for-dell-avamar-dell-networker-virtual-edition-nve-and-dell-powerprotect-dp-series-appliance-dell-integrated-data-protection-appliance-idpa-multiple-third-party-vulnerabilities
• Red Hat Security Advisory RHSA-2026:62549 vom 2026-09-10
  https://access.redhat.com/errata/RHSA-2026:62549
• Red Hat Security Advisory RHSA-2026:62409 vom 2026-09-14
  https://access.redhat.com/errata/RHSA-2026:62409
• Red Hat Security Advisory RHSA-2026:65851 vom 2026-09-17
  https://access.redhat.com/errata/RHSA-2026:65851
• Red Hat Security Advisory RHSA-2026:65839 vom 2026-09-17
  https://access.redhat.com/errata/RHSA-2026:65839
• F5 Security Advisory K000163345 vom 2026-09-21
  https://my.f5.com/manage/s/article/K000163345
• F5 Security Advisory K000163346 vom 2026-09-21
  https://my.f5.com/manage/s/article/K000163346
• F5 Security Advisory K000163347 vom 2026-09-21
  https://my.f5.com/manage/s/article/K000163347
• F5 Security Advisory K000163397 vom 2026-09-24
  https://my.f5.com/manage/s/article/K000163397
• Red Hat Security Advisory RHSA-2026:67837 vom 2026-09-24
  https://access.redhat.com/errata/RHSA-2026:67837
• Red Hat Security Advisory RHSA-2026:67857 vom 2026-09-28
  https://access.redhat.com/errata/RHSA-2026:67857
• NetApp Security Advisory NTAP-20261014-0019 vom 2026-10-14
  https://security.netapp.com/advisory/NTAP-20261014-0019
• NetApp Security Advisory NTAP-20261014-0018 vom 2026-10-14
  https://security.netapp.com/advisory/NTAP-20261014-0018
• NetApp Security Advisory NTAP-20261014-0017 vom 2026-10-14
  https://security.netapp.com/advisory/NTAP-20261014-0017
• NetApp Security Advisory NTAP-20261014-0016 vom 2026-10-14
  https://security.netapp.com/advisory/NTAP-20261014-0016
• NetApp Security Advisory NTAP-20261014-0015 vom 2026-10-14
  https://security.netapp.com/advisory/NTAP-20261014-0015
• Red Hat Security Advisory RHSA-2026:82888 vom 2026-10-14
  https://access.redhat.com/errata/RHSA-2026:82888
• Red Hat Security Advisory RHSA-2026:77320 vom 2026-10-15
  https://access.redhat.com/errata/RHSA-2026:77320
• Red Hat Security Advisory RHSA-2026:82811 vom 2026-10-22
  https://access.redhat.com/errata/RHSA-2026:82811
• Red Hat Security Advisory RHSA-2026:89651 vom 2026-10-27
  https://access.redhat.com/errata/RHSA-2026:89651
• Red Hat Security Advisory RHSA-2026:89232 vom 2026-10-27
  https://access.redhat.com/errata/RHSA-2026:89232