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CVE-2026-42011

Medium priority

Some fixes available 4 of 7

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...

1 affected package

gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls28 Fixed Fixed Fixed Needs evaluation Needs evaluation
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CVE-2026-42010

Medium priority

Some fixes available 4 of 7

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...

1 affected package

gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls28 Fixed Fixed Fixed Needs evaluation Needs evaluation
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CVE-2026-33846

Medium priority

Some fixes available 4 of 7

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...

1 affected package

gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls28 Fixed Fixed Fixed Needs evaluation Needs evaluation
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CVE-2026-3832

Medium priority

Some fixes available 4 of 7

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...

1 affected package

gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls28 Fixed Fixed Fixed Needs evaluation Needs evaluation
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CVE-2026-5419

Medium priority
Fixed

The PKCS#7 padding check performed during decryption was not constant-time, potentially leaking information about the padding bytes through timing differences.

1 affected package

gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls28 Fixed Fixed Not affected Not affected Not affected
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CVE-2026-5260

Medium priority

Some fixes available 4 of 7

For a server using an RSA key backed by a PKCS#11 token, a client sending an extremely short premaster secret during an RSA key exchange could trigger a short heap overread.

1 affected package

gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls28 Fixed Fixed Fixed Needs evaluation Needs evaluation
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CVE-2026-42015

Medium priority

Some fixes available 4 of 7

Appending to a PKCS#12 bag that already contained 32 elements could write past the bag's internal array.

1 affected package

gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls28 Fixed Fixed Fixed Needs evaluation Needs evaluation
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CVE-2026-42014

Medium priority

Some fixes available 4 of 7

Changing the Security Officer PIN with gnutls_pkcs11_token_set_pin() with oldpin == NULL for a token lacking a protected authentication path led to a use-after-free.

1 affected package

gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls28 Fixed Fixed Fixed Needs evaluation Needs evaluation
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CVE-2026-42013

Medium priority

Some fixes available 4 of 7

Validation of certificates with oversized Subject Alternative Names would fall back to checking DNS hostnames against Common Name.

1 affected package

gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls28 Fixed Fixed Fixed Needs evaluation Needs evaluation
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CVE-2026-42012

Medium priority

Some fixes available 4 of 7

Certificates containing URI or SRV Subject Alternative Names would fall back to checking DNS hostnames against Common Name, allowing potential misuse of such certificates beyond their original purpose.

1 affected package

gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls28 Fixed Fixed Fixed Needs evaluation Needs evaluation
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