Описание
Security update for gnutls
This update for gnutls fixes the following issues
- CVE-2026-3832: cert-session: fix multi-entry OCSP revocation bypass (bsc#1263706).
- CVE-2026-3833: x509/name-constraints: compare domain names case-insensitive (bsc#1263707).
- CVE-2026-5260: lib/pkcs11_privkey: guard against overreading on short ciphertexts (bsc#1263715).
- CVE-2026-5419: gnutls_cipher_decrypt3: make PKCS#7 unpadding branch free (bsc#1263716).
- CVE-2026-33845: buffers: switch from end_offset over to frag_length (bsc#1263704).
- CVE-2026-33846: buffers: add more checks to DTLS reassembly (bsc#1263705).
- CVE-2026-42009: lib/buffers: ensure packets have differing sequence numbers (bsc#1263708).
- CVE-2026-42010: lib/auth/rsa_psk: fix binary PSK identity lookup (bsc#1263709).
- CVE-2026-42011: x509/name_constraints: fix intersecting empty constraints (bsc#1263710).
- CVE-2026-42012: x509/hostname-verify: make URI/SRV SAN preclude CN fallback (bsc#1263711).
- CVE-2026-42013: x509: prevent fallback on oversized SAN (bsc#1263712).
- CVE-2026-42014: pkcs11_write: fix UAF and leak in gnutls_pkcs11_token_set_pin (bsc#1263713).
- CVE-2026-42015: x509/pkcs12_bag: fix off-by-one in bag element bounds chec (bsc#1263714).
Список пакетов
openSUSE Leap 16.0
Ссылки
- SUSE Security Ratings
- SUSE Bug 1263704
- SUSE Bug 1263705
- SUSE Bug 1263706
- SUSE Bug 1263707
- SUSE Bug 1263708
- SUSE Bug 1263709
- SUSE Bug 1263710
- SUSE Bug 1263711
- SUSE Bug 1263712
- SUSE Bug 1263713
- SUSE Bug 1263714
- SUSE Bug 1263715
- SUSE Bug 1263716
- SUSE CVE CVE-2026-33845 page
- SUSE CVE CVE-2026-33846 page
- SUSE CVE CVE-2026-3832 page
- SUSE CVE CVE-2026-3833 page
- SUSE CVE CVE-2026-42009 page
- SUSE CVE CVE-2026-42010 page
Описание
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 disclosure or denial of service.
Затронутые продукты
Ссылки
- CVE-2026-33845
- SUSE Bug 1263704
Описание
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 that the message_length field remains consistent across all fragments of the same logical message. An attacker can exploit this by sending crafted DTLS fragments with conflicting message_length values, causing the implementation to allocate a buffer based on a smaller initial fragment and subsequently write beyond its bounds using larger, inconsistent fragments. Because the merge operation does not enforce proper bounds checking against the allocated buffer size, this results in an out-of-bounds write on the heap. The vulnerability is remotely exploitable without authentication via the DTLS handshake path and can lead to application crashes or potential memory corruption.
Затронутые продукты
Ссылки
- CVE-2026-33846
- SUSE Bug 1263705
Описание
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 responses, a client with OCSP verification enabled may incorrectly accept a revoked server certificate, potentially leading to a compromise of trust.
Затронутые продукты
Ссылки
- CVE-2026-3832
- SUSE Bug 1263706
Описание
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 remote attacker can exploit this by crafting a leaf certificate with casing differences in the Subject Alternative Name (SAN), leading to a policy bypass where a certificate that should be rejected is instead accepted. This could result in unauthorized access or information disclosure.
Затронутые продукты
Ссылки
- CVE-2026-3833
- SUSE Bug 1263707
Описание
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 with duplicate sequence numbers. This could lead to unstable packet ordering or undefined behavior, resulting in a denial of service.
Затронутые продукты
Ссылки
- CVE-2026-42009
- SUSE Bug 1263708
Описание
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, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.
Затронутые продукты
Ссылки
- CVE-2026-42010
- SUSE Bug 1263709
Описание
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 constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.
Затронутые продукты
Ссылки
- CVE-2026-42011
- SUSE Bug 1263710
Описание
unknown
Затронутые продукты
Ссылки
- CVE-2026-42012
- SUSE Bug 1263711
Описание
unknown
Затронутые продукты
Ссылки
- CVE-2026-42013
- SUSE Bug 1263712
Описание
unknown
Затронутые продукты
Ссылки
- CVE-2026-42014
- SUSE Bug 1263713
Описание
unknown
Затронутые продукты
Ссылки
- CVE-2026-42015
- SUSE Bug 1263714
Описание
unknown
Затронутые продукты
Ссылки
- CVE-2026-5260
- SUSE Bug 1263715
Описание
unknown
Затронутые продукты
Ссылки
- CVE-2026-5419
- SUSE Bug 1263716