CVE-2026-42014

A flaw was found in GnuTLS. The gnutls_pkcs11_token_set_pin function, used for changing the Security Officer PIN, can lead to a use-after-free vulnerability. This occurs when an attacker attempts to change the PIN with a NULL old PIN for a token that lacks a protected authentication path.

A flaw was found in GnuTLS. The gnutls_pkcs11_token_set_pin function, used for changing the Security Officer PIN, can lead to a use-after-free vulnerability. This occurs when an attacker attempts to change the PIN with a NULL old PIN for a token that lacks a protected authentication path.

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols and technologies around them. It provides a simple C language application programming interface (API) to access the secure communications protocols as well as APIs to parse and write X.509, PKCS #12, and other required structures. The project strives to provide a secure communications back-end, simple to use and integrated with the rest of the base Linux libraries. A back-end designed to work and be secure out of the box, keeping the complexity of TLS and PKI out of application code.

Security Fix(es):

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.(CVE-2026-33846)

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.(CVE-2026-3833)

(CVE-2026-42009)

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.(CVE-2026-42010)

(CVE-2026-42013)

(CVE-2026-42014)

(CVE-2026-42015)

(CVE-2026-5260)

(CVE-2026-5419)

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols and technologies around them. It provides a simple C language application programming interface (API) to access the secure communications protocols as well as APIs to parse and write X.509, PKCS #12, and other required structures. The project strives to provide a secure communications back-end, simple to use and integrated with the rest of the base Linux libraries. A back-end designed to work and be secure out of the box, keeping the complexity of TLS and PKI out of application code.

Security Fix(es):

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.(CVE-2026-33846)

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.(CVE-2026-3833)

(CVE-2026-42009)

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.(CVE-2026-42010)

(CVE-2026-42013)

(CVE-2026-42014)

(CVE-2026-42015)

(CVE-2026-5260)

(CVE-2026-5419)

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols and technologies around them. It provides a simple C language application programming interface (API) to access the secure communications protocols as well as APIs to parse and write X.509, PKCS #12, and other required structures. The project strives to provide a secure communications back-end, simple to use and integrated with the rest of the base Linux libraries. A back-end designed to work and be secure out of the box, keeping the complexity of TLS and PKI out of application code.

Security Fix(es):

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.(CVE-2026-33846)

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.(CVE-2026-3833)

(CVE-2026-42009)

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.(CVE-2026-42010)

(CVE-2026-42013)

(CVE-2026-42014)

(CVE-2026-42015)

(CVE-2026-5260)

(CVE-2026-5419)

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols and technologies around them. It provides a simple C language application programming interface (API) to access the secure communications protocols as well as APIs to parse and write X.509, PKCS #12, and other required structures. The project strives to provide a secure communications back-end, simple to use and integrated with the rest of the base Linux libraries. A back-end designed to work and be secure out of the box, keeping the complexity of TLS and PKI out of application code.

Security Fix(es):

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.(CVE-2026-42009)

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.(CVE-2026-42010)

(CVE-2026-42013)

(CVE-2026-42014)

(CVE-2026-42015)

(CVE-2026-5260)

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols and technologies around them. It provides a simple C language application programming interface (API) to access the secure communications protocols as well as APIs to parse and write X.509, PKCS #12, and other required structures. The project strives to provide a secure communications back-end, simple to use and integrated with the rest of the base Linux libraries. A back-end designed to work and be secure out of the box, keeping the complexity of TLS and PKI out of application code.

Security Fix(es):

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.(CVE-2026-3833)

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.(CVE-2026-42009)

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.(CVE-2026-42010)

(CVE-2026-42013)

(CVE-2026-42014)

(CVE-2026-42015)

(CVE-2026-5260)

Please update the gnutls packages to provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.

Security Fix(es):

• gnutls: Add more checks to DTLS reassembly (CVE-2026-33846)
• gnutls: Fix qsort comparator in DTLS reassembly (CVE-2026-42009)
• gnutls: Fix crashing on an underflow with a DTLS datagram (CVE-2026-33845)
• gnutls: Fix RSA-PSK identity truncation (CVE-2026-42010)
• gnutls: Fix case-sensitivity of domain name comparison in name constraints (CVE-2026-3833)
• gnutls: Fix intersecting empty constraints (CVE-2026-42011)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.

Security Fix(es):

• gnutls: Fix qsort comparator in DTLS reassembly (CVE-2026-42009)
• gnutls: Fix crashing on an underflow with a DTLS datagram (CVE-2026-33845)
• gnutls: Fix RSA-PSK identity truncation (CVE-2026-42010)
• gnutls: Fix case-sensitivity of domain name comparison in name constraints (CVE-2026-3833)
• gnutls: Fix intersecting empty name constraints (CVE-2026-42011)
• gnutls: Denial of Service via heap buffer overflow in DTLS handshake fragment reassembly (CVE-2026-33846)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.

Security Fix(es):

• gnutls: Fix qsort comparator in DTLS reassembly (CVE-2026-42009)
• gnutls: Fix crashing on an underflow with a DTLS datagram (CVE-2026-33845)
• gnutls: Fix RSA-PSK identity truncation (CVE-2026-42010)
• gnutls: Fix case-sensitivity of domain name comparison in name constraints (CVE-2026-3833)
• gnutls: Fix intersecting empty name constraints (CVE-2026-42011)
• gnutls: Denial of Service via heap buffer overflow in DTLS handshake fragment reassembly (CVE-2026-33846)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

A flaw was found in GnuTLS. The gnutls_pkcs11_token_set_pin function, used for changing the Security Officer PIN, can lead to a use-after-free vulnerability. This occurs when an attacker attempts to change the PIN with a NULL old PIN for a token that lacks a protected authentication path.

Please update the gnutls packages to provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.

Security Fix(es):

• gnutls: Add more checks to DTLS reassembly (CVE-2026-33846)
• gnutls: Fix qsort comparator in DTLS reassembly (CVE-2026-42009)
• gnutls: Fix crashing on an underflow with a DTLS datagram (CVE-2026-33845)
• gnutls: Fix RSA-PSK identity truncation (CVE-2026-42010)
• gnutls: Fix case-sensitivity of domain name comparison in name constraints (CVE-2026-3833)
• gnutls: Fix intersecting empty constraints (CVE-2026-42011)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library,
which implements cryptographic algorithms and protocols such as SSL, TLS, and
DTLS.

Security Fix(es):

• gnutls: Fix qsort comparator in DTLS reassembly (CVE-2026-42009)
• gnutls: Fix crashing on an underflow with a DTLS datagram

(CVE-2026-33845)

• gnutls: Fix RSA-PSK identity truncation (CVE-2026-42010)
• gnutls: Fix case-sensitivity of domain name comparison in name

constraints (CVE-2026-3833)

• gnutls: Fix intersecting empty name constraints (CVE-2026-42011)
• gnutls: Denial of Service via heap buffer overflow in DTLS handshake

fragment reassembly (CVE-2026-33846)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE page(s)
listed in the References section.

The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library,
which implements cryptographic algorithms and protocols such as SSL, TLS, and
DTLS.

Security Fix(es):

• gnutls: Fix qsort comparator in DTLS reassembly (CVE-2026-42009)
• gnutls: Fix crashing on an underflow with a DTLS datagram (CVE-2026-33845)
• gnutls: Fix RSA-PSK identity truncation (CVE-2026-42010)
• gnutls: Fix case-sensitivity of domain name comparison in name constraints (CVE-2026-3833)
• gnutls: Fix intersecting empty name constraints (CVE-2026-42011)
• gnutls: Denial of Service via heap buffer overflow in DTLS handshake fragment reassembly (CVE-2026-33846)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE page(s)
listed in the References section.

A flaw was found in GnuTLS. The gnutls_pkcs11_token_set_pin function, used for changing the Security Officer PIN, can lead to a use-after-free vulnerability. This occurs when an attacker attempts to change the PIN with a NULL old PIN for a token that lacks a protected authentication path.

• CVE-2026-33846: DTLS handshake reassembly add more checks (buffers.c)
• CVE-2026-42009: DTLS reorder qsort with duplicate sequence numbers
• CVE-2026-42011: X.509 name constraints intersection of empty constraints
• CVE-2026-42012: URI/SRV SAN preclude CN fallback
• CVE-2026-42013: prevent fallback on oversized SAN
• CVE-2026-42014: PKCS#11 token set_pin UAF + leak
• CVE-2026-5260: PKCS#11 RSA short-ciphertext overread; ciphertext must match modulus size
• CVE-2026-42015: PKCS#12 bag-element off-by-one bound check

• CVE-2026-33846: DTLS handshake reassembly add more checks (buffers.c)
• CVE-2026-42009: DTLS reorder qsort with duplicate sequence numbers
• CVE-2026-42011: X.509 name constraints intersection of empty constraints
• CVE-2026-42012: URI/SRV SAN preclude CN fallback
• CVE-2026-42013: prevent fallback on oversized SAN
• CVE-2026-42014: PKCS#11 token set_pin UAF + leak
• CVE-2026-5260: PKCS#11 RSA short-ciphertext overread; ciphertext must match modulus size
• CVE-2026-42015: PKCS#12 bag-element off-by-one bound check

• CVE-2026-33846: fix heap buffer overflow in DTLS handshake fragment reassembly by validating message-length consistency and bounding the fragment write against the destination buffer capacity
• CVE-2026-42009: fix undefined behaviour in DTLS packet ordering by making the handshake_compare qsort comparator return 0 for equal sequence numbers
• CVE-2026-42011: fix name constraints bypass by no longer short-circuiting the intersection of an empty permitted set, so later permitted constraints are still enforced
• CVE-2026-42012: fix certificate verification bypass by making URI and SRV subjectAltName entries preclude the legacy CN fallback hostname check
• CVE-2026-42013: fix certificate verification bypass by preventing CN and DN-email fallback when a subjectAltName entry is oversized
• CVE-2026-5260: fix heap overread in RSA key exchange by rejecting a ciphertext whose size does not match the RSA modulus
• CVE-2026-42014: fix use-after-free and leak in gnutls_pkcs11_token_set_pin when changing the security officer PIN

• CVE-2026-33846: fix heap buffer overflow in DTLS handshake fragment reassembly by validating message-length consistency and bounding the fragment write against the destination buffer capacity
• CVE-2026-42009: fix undefined behaviour in DTLS packet ordering by making the handshake_compare qsort comparator return 0 for equal sequence numbers
• CVE-2026-42011: fix name constraints bypass by no longer short-circuiting the intersection of an empty permitted set, so later permitted constraints are still enforced
• CVE-2026-42012: fix certificate verification bypass by making URI and SRV subjectAltName entries preclude the legacy CN fallback hostname check
• CVE-2026-42013: fix certificate verification bypass by preventing CN and DN-email fallback when a subjectAltName entry is oversized
• CVE-2026-5260: fix heap overread in RSA key exchange by rejecting a ciphertext whose size does not match the RSA modulus
• CVE-2026-42014: fix use-after-free and leak in gnutls_pkcs11_token_set_pin when changing the security officer PIN
• CVE-2026-42015: fix off-by-one out-of-bounds write when appending an element to a PKCS#12 bag that already holds the maximum number of elements

• CVE-2026-42014: fix use-after-free and leak in gnutls_pkcs11_token_set_pin when changing the Security Officer PIN with oldpin == NULL on a token lacking a protected authentication path
• CVE-2026-42015: fix off-by-one bounds check in gnutls_pkcs12_bag_set_data that allowed writing past the 32-element PKCS#12 bag array when appending to an imported bag already holding the maximum number of elements

• Rebased onto the vendor 3.3.29-9.0.3.el7_9 sources
• CVE-2026-5260: guard PKCS#11 RSA decryption against short-ciphertext heap overread (TuxCare fix retained)
• CVE-2026-42014 and CVE-2026-42015 are fixed by the vendor in this build
• CVE-2026-42011 is not applicable to this baseline per the vendor assessment
• CVE-2026-33845, CVE-2026-33846, CVE-2026-3833, CVE-2026-42009, CVE-2026-42012 and CVE-2026-42013 are now fixed by the vendor; the TuxCare duplicates are dropped
• CVE-2026-3833 follow-up: the vendor's email_matches() no longer matches a bare-domain rfc822Name against a bare-domain constraint of the same length, which 3.3.29 did; restore that comparison, case-insensitively, and add the assertions to tests/name-constraints.c

• Rebased onto the vendor 3.3.29-9.0.3.el7_9 sources
• CVE-2026-5260: guard PKCS#11 RSA decryption against short-ciphertext heap overread (TuxCare fix retained)
• CVE-2026-42014 and CVE-2026-42015 are fixed by the vendor in this build
• CVE-2026-42011 is not applicable to this baseline per the vendor assessment
• CVE-2026-33845, CVE-2026-33846, CVE-2026-3833, CVE-2026-42009, CVE-2026-42012 and CVE-2026-42013 are now fixed by the vendor; the TuxCare duplicates are dropped
• CVE-2026-3833 follow-up: the vendor's email_matches() no longer matches a bare-domain rfc822Name against a bare-domain constraint of the same length, which 3.3.29 did; restore that comparison, case-insensitively, and add the assertions to tests/name-constraints.c

• Rebased onto the vendor 3.3.29-9.0.3.el7_9 sources
• CVE-2026-5260: guard PKCS#11 RSA decryption against short-ciphertext heap overread (TuxCare fix retained)
• CVE-2026-42014 and CVE-2026-42015 are fixed by the vendor in this build
• CVE-2026-42011 is not applicable to this baseline per the vendor assessment
• CVE-2026-33845, CVE-2026-33846, CVE-2026-3833, CVE-2026-42009, CVE-2026-42012 and CVE-2026-42013 are now fixed by the vendor; the TuxCare duplicates are dropped
• CVE-2026-3833 follow-up: the vendor's email_matches() no longer matches a bare-domain rfc822Name against a bare-domain constraint of the same length, which 3.3.29 did; restore that comparison, case-insensitively, and add the assertions to tests/name-constraints.c

These are all security issues fixed in the gnutls-3.8.13-1.1 package on the GA media of openSUSE Tumbleweed.

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).

This update for gnutls fixes the following issues

• 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-2026-33845: 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).

This update for gnutls fixes the following issues

• 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).

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).

This update for gnutls fixes the following issues

• 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).

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).

This update for gnutls fixes the following issues

• 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).

This update for gnutls fixes the following issues

• CVE-2025-14831: excessive resource consumption when verifying specially crafted malicious certificates containing a large number of name constraints and SANs (bsc#1257960).
• CVE-2026-3833: incorrectly accepted domain names due to comparison during name constraints processing being case-sensitive (bsc#1263707).
• CVE-2026-5260: heap overread when processing extremely short premaster secret as part of an RSA key exchange (bsc#1263715).
• CVE-2026-33845: integer overflow and heap overrun when parsing fragments with zero length and non-zero offset during DTLS handshake (bsc#1263704).
• CVE-2026-33846: heap overwrite during DTLS handshake fragment reassembly due to missing validations and checks (bsc#1263705).
• CVE-2026-42009: undefined behavior resulting in a DoS when handling DTLS packets with duplicate sequence numbers (bsc#1263708).
• CVE-2026-42010: authentication bypass when processing a PSK username with a NUL-character (bsc#1263709).
• CVE-2026-42011: name constraint bypass leading to acceptance of invalid certificates during certificate validation (bsc#1263710).
• CVE-2026-42012: spoofing of legitimate services and sensitive information interception via specially crafted certificates containing URIs or SRV SANs. (bsc#1263711).
• CVE-2026-42013: certificate validation bypass when validating certificates with an oversized SAN (bsc#1263712).
• CVE-2026-42014: use-after-free when an attacker attempts to change the PIN with a NULL old PIN for a token that lacks a protected authentication path (bsc#1263713).
• CVE-2026-42015: memory corruption when appending to a PKCS#12 bag that already contains 32 elements (bsc#1263714).

This update for gnutls fixes the following issues

• CVE-2026-3833: incorrectly accepted domain names due to comparison during name constraints processing being case-sensitive (bsc#1263707).
• CVE-2026-5260: heap overread when processing extremely short premaster secret as part of an RSA key exchange (bsc#1263715).
• CVE-2026-42011: name constraint bypass leading to acceptance of invalid certificates during certificate validation (bsc#1263710).
• CVE-2026-42013: certificate validation bypass when validating certificates with an oversized SAN (bsc#1263712).
• CVE-2026-42014: use-after-free when an attacker attempts to change the PIN with a NULL old PIN for a token that lacks a protected authentication path (bsc#1263713).
• CVE-2026-42015: memory corruption when appending to a PKCS#12 bag that already contains 32 elements (bsc#1263714).

This update for gnutls fixes the following issues

• CVE-2026-3833: incorrectly accepted domain names due to comparison during name constraints processing being case-sensitive (bsc#1263707).
• CVE-2026-5260: heap overread when processing extremely short premaster secret as part of an RSA key exchange (bsc#1263715).
• CVE-2026-42011: name constraint bypass leading to acceptance of invalid certificates during certificate validation (bsc#1263710).
• CVE-2026-42013: certificate validation bypass when validating certificates with an oversized SAN (bsc#1263712).
• CVE-2026-42014: use-after-free when an attacker attempts to change the PIN with a NULL old PIN for a token that lacks a protected authentication path (bsc#1263713).
• CVE-2026-42015: memory corruption when appending to a PKCS#12 bag that already contains 32 elements (bsc#1263714).

This update for gnutls fixes the following issue

• Rebase the CVE-2026-42014 patch to include a missing call to p11_kit_uri_free() in gnutls_pkcs11_token_set_pin() (bsc#1263713).

Haruto Kimura discovered that GnuTLS did not properly apply permitted name constraints in certain certificate validation paths. A remote attacker could possibly use this issue to bypass certificate validation, leading to a machine-in-the-middle attack. (CVE-2026-42011)

Oleh Konko discovered that GnuTLS incorrectly fell back to Common Name checks for certain URI and SRV subject alternative names. A remote attacker could possibly use this issue to bypass certificate validation, leading to a machine-in-the-middle attack. (CVE-2026-42012)

Haruto Kimura and Joshua Rogers discovered that GnuTLS incorrectly fell back to Common Name checks when subject alternative names were oversized. A remote attacker could possibly use this issue to bypass certificate validation, leading to a machine-in-the-middle attack. (CVE-2026-42013)

Luigino Camastra and Joshua Rogers discovered that GnuTLS had a use-after-free issue when changing PKCS#11 token security officer PINs in certain cases. An attacker could possibly use this issue to cause GnuTLS to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-42014)

Zou Dikai discovered that GnuTLS did not properly validate PKCS#12 bag sizes in certain cases. An attacker could possibly use this issue to cause GnuTLS to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-42015)