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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-2021-4209

Low priority

Some fixes available 3 of 5

A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication...

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 Not in release Not in release
gnutls28 Not affected Not affected Not affected Fixed Fixed
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CVE-2019-3836

Medium priority
Fixed

It was discovered in gnutls before version 3.6.7 upstream that there is an uninitialized pointer access in gnutls versions 3.6.3 or later which can be triggered by certain post-handshake messages.

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
gnutls28 — — — — Not affected
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CVE-2019-3829

Medium priority
Fixed

A vulnerability was found in gnutls versions from 3.5.8 before 3.6.7. A memory corruption (double free) vulnerability in the certificate verification API. Any client or server application that verifies X.509 certificates with...

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
gnutls28 — — — — Fixed
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CVE-2018-16868

Low priority

Some fixes available 9 of 10

A Bleichenbacher type side-channel based padding oracle attack was found in the way gnutls handles verification of RSA decrypted PKCS#1 v1.5 data. An attacker who is able to run process on the same physical core as the...

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 — — Fixed Fixed Ignored
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CVE-2018-10846

Medium priority

Some fixes available 2 of 3

A cache-based side channel in GnuTLS implementation that leads to plain text recovery in cross-VM attack setting was found. An attacker could use a combination of "Just in Time" Prime+probe attack in combination with Lucky-13...

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 Not in release Not in release
gnutls28 Not affected Not affected Not affected Not affected Fixed
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