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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

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...

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

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...

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

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...

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

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...

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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