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CVE-2026-88648

Medium priority
Vulnerable

In GnuTLS v3.8.13, an excluded msUPN/SRV otherName is never checked. NOTE: the Supplier does not consider this an actionable security vulnerability because of its "threat model doesn't consider attacks only possible by modifying...

2 affected packages

gnutls26, gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls26 Not in release Not in release Not in release — —
gnutls28 Vulnerable Vulnerable Vulnerable Vulnerable Vulnerable
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CVE-2026-67693

Medium priority
Vulnerable

GnuTLS v3.8.13 does not reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU). NOTE: the Supplier does not consider this an actionable security vulnerability...

2 affected packages

gnutls26, gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls26 Not in release Not in release Not in release — —
gnutls28 Vulnerable Vulnerable Vulnerable Vulnerable Vulnerable
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CVE-2026-95210

Medium priority
Vulnerable

GnuTLS v3.8.13 does not reject a critical keyUsage extension when it cannot be processed, such as when extnValue is an ASN.1 NULL (05 00) instead of a BIT STRING. NOTE: the Supplier does not consider this an actionable security...

2 affected packages

gnutls26, gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls26 Not in release Not in release Not in release — —
gnutls28 Vulnerable Vulnerable Vulnerable Vulnerable Vulnerable
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CVE-2026-95184

Medium priority
Vulnerable

GnuTLS v3.8.13 does not properly enforce name constraints, as demonstrated by a permitted subtree violation for "EE O=Evil accepted although outside permitted O=Good." NOTE: the Supplier does not consider this an...

2 affected packages

gnutls26, gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls26 Not in release Not in release Not in release — —
gnutls28 Vulnerable Vulnerable Vulnerable Vulnerable Vulnerable
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CVE-2026-88647

Medium priority
Vulnerable

GnuTLS v3.8.13 can perhaps unexpectedly trust a certificate on the basis of Common Name when Subject Alternative Name has an SRV otherName (1.3.6.1.5.5.7.8.7) whose value is an OCTET STRING. NOTE: the Supplier does not consider...

2 affected packages

gnutls26, gnutls28

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
gnutls26 Not in release Not in release Not in release — —
gnutls28 Vulnerable Vulnerable Vulnerable Vulnerable Vulnerable
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CVE-2026-42011

Medium priority
Fixed

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 Fixed Fixed
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CVE-2026-42010

Medium priority
Fixed

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 Fixed Not affected
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CVE-2026-33846

Medium priority
Fixed

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 Fixed Fixed
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CVE-2026-3832

Medium priority
Fixed

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 Not affected Not affected
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CVE-2026-5419

Medium priority
Fixed

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...

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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