ALT-PU-2026-7127-6

BDU:2026-07115

LOW3.7

Уязвимость функции check_ocsp_response() библиотеки GnuTLS, позволяющая нарушителю обойти существующие механизмы безопасности

Published: 2026-05-21

CVSS 3.xLOW 3.7

CVSS:3.x/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS 2.0LOW 2.6

CVSS:2.0/AV:N/AC:H/Au:N/C:P/I:N/A:N

References

BDU:2026-07116

HIGH7.4

Уязвимость функции compare_strings() библиотеки GnuTLS, позволяющая нарушителю получить несанкционированный доступ к защищаемой информации

Published: 2026-05-21Modified: 2026-07-06

CVSS 3.xHIGH 7.4

CVSS:3.x/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS 2.0HIGH 7.1

CVSS:2.0/AV:N/AC:H/Au:N/C:C/I:C/A:N

References

BDU:2026-09340

HIGH7.5

Уязвимость функции parse_handshake_header() криптографической библиотеки GnuTLS, позволяющая нарушителю вызвать отказ в обслуживании

Published: 2026-07-06Modified: 2026-07-15

CVSS 3.xHIGH 7.5

CVSS:3.x/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 2.0HIGH 7.8

CVSS:2.0/AV:N/AC:L/Au:N/C:N/I:N/A:C

References

BDU:2026-09344

HIGH7.5

Уязвимость функции merge_handshake_packet() криптографической библиотеки GnuTLS, позволяющая нарушителю вызвать отказ в обслуживании

Published: 2026-07-07Modified: 2026-07-15

CVSS 3.xHIGH 7.5

CVSS:3.x/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 2.0HIGH 7.8

CVSS:2.0/AV:N/AC:L/Au:N/C:N/I:N/A:C

References

BDU:2026-09650

CRITICAL9.8

Уязвимость функции _gnutls_proc_rsa_psk_client_kx() файла lib/auth/rsa_psk.c криптографической библиотеки GnuTLS, позволяющая нарушителю обойти существующие механизмы безопасности и получить несанкционированный доступ к защищаемой информации

Published: 2026-07-12Modified: 2026-07-15

CVSS 3.xCRITICAL 9.8

CVSS:3.x/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS 2.0CRITICAL 10.0

CVSS:2.0/AV:N/AC:L/Au:N/C:C/I:C/A:C

References

BDU:2026-09651

HIGH7.5

Уязвимость реализации протокола DTLS криптографической библиотеки GnuTLS, позволяющая нарушителю вызвать отказ в обслуживании

Published: 2026-07-12Modified: 2026-07-15

CVSS 3.xHIGH 7.5

CVSS:3.x/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 2.0HIGH 7.8

CVSS:2.0/AV:N/AC:L/Au:N/C:N/I:N/A:C

BDU:2026-09657

MEDIUM5.3

Уязвимость функции gnutls_pkcs12_bag_set_data() криптографической библиотеки GnuTLS, позволяющая нарушителю повредить память или вызвать отказ в обслуживании

Published: 2026-07-12Modified: 2026-07-15

CVSS 3.xMEDIUM 5.3

CVSS:3.x/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS 2.0MEDIUM 5.0

CVSS:2.0/AV:N/AC:L/Au:N/C:N/I:N/A:P

References

BDU:2026-09658

MEDIUM6.6

Уязвимость функции gnutls_pkcs11_token_set_pin() файла lib/pkcs11_write.c b/lib/pkcs11_write.c криптографической библиотеки GnuTLS, позволяющая нарушителю вызвать отказ в обслуживании

Published: 2026-07-12Modified: 2026-07-15

CVSS 3.xMEDIUM 6.6

CVSS:3.x/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H

CVSS 2.0MEDIUM 5.7

CVSS:2.0/AV:L/AC:L/Au:S/C:P/I:P/A:C

References

BDU:2026-09659

HIGH8.2

Уязвимость функции gnutls_x509_crt_check_hostname2() файла lib/x509/hostname-verify.c криптографической библиотеки GnuTLS, позволяющая нарушителю выполнить атаку MITM

Published: 2026-07-12Modified: 2026-07-15

CVSS 3.xHIGH 8.2

CVSS:3.x/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

CVSS 2.0HIGH 8.5

CVSS:2.0/AV:N/AC:L/Au:N/C:P/I:C/A:N

References

BDU:2026-09660

HIGH7.1

Уязвимость функции gnutls_x509_crt_check_hostname2() файла lib/x509/hostname-verify.c:111,245-265 криптографической библиотеки GnuTLS, позволяющая нарушителю осуществить подмену сервера и получить несанкционированный доступ к защищаемой информации

Published: 2026-07-12Modified: 2026-07-15

CVSS 3.xHIGH 7.1

CVSS:3.x/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N

CVSS 2.0HIGH 8.5

CVSS:2.0/AV:N/AC:L/Au:N/C:P/I:C/A:N

References

BDU:2026-09661

HIGH7.4

Уязвимость функции name_constraints_node_list_intersect() файла lib/x509/name_constraints.c:726-727 криптографической библиотеки GnuTLS, позволяющая нарушителю выполнить атаку MITM

Published: 2026-07-12Modified: 2026-07-15

CVSS 3.xHIGH 7.4

CVSS:3.x/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS 2.0HIGH 7.1

CVSS:2.0/AV:N/AC:H/Au:N/C:C/I:C/A:N

References

BDU:2026-09766

LOW3.7

Уязвимость криптографической библиотеки GnuTLS, связанная с раскрытием информации на основании временных расхождений, позволяющая нарушителю получить несанкционированный доступ к защищаемой информации

Published: 2026-07-14

CVSS 3.xLOW 3.7

CVSS:3.x/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS 2.0LOW 2.6

CVSS:2.0/AV:N/AC:H/Au:N/C:P/I:N/A:N

References

BDU:2026-09776

HIGH8.2

Уязвимость криптографической библиотеки GnuTLS, связанная с выходом операции за границы буфера в памяти, позволяющая нарушителю раскрыть защищаемую информацию

Published: 2026-07-14Modified: 2026-08-03

CVSS 3.xHIGH 8.2

CVSS:3.x/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CVSS 2.0HIGH 8.5

CVSS:2.0/AV:N/AC:L/Au:N/C:P/I:N/A:C

References

CVE-2026-33845

CRITICAL9.1

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.

Published: 2026-04-30Modified: 2026-07-20

CVSS 3.xCRITICAL 9.1

CVSS:3.x/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

References

CVE-2026-33846

HIGH7.5

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.

Published: 2026-05-04Modified: 2026-07-20

CVSS 3.xHIGH 7.5

CVSS:3.x/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

CVE-2026-3832

LOW3.7

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 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.

Published: 2026-04-30Modified: 2026-07-13

CVSS 3.xLOW 3.7

CVSS:3.x/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References

CVE-2026-3833

HIGH7.4

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.

Published: 2026-04-30Modified: 2026-07-22

CVSS 3.xHIGH 7.4

CVSS:3.x/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

CVE-2026-42009

HIGH7.5

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.

Published: 2026-05-18Modified: 2026-07-23

CVSS 3.xHIGH 7.5

CVSS:3.x/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

CVE-2026-42010

CRITICAL9.8

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.

Published: 2026-05-07Modified: 2026-07-23

CVSS 3.xCRITICAL 9.8

CVSS:3.x/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

CVE-2026-42011

HIGH7.4

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.

Published: 2026-05-07Modified: 2026-07-22

CVSS 3.xHIGH 7.4

CVSS:3.x/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

CVE-2026-42012

HIGH7.1

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 could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.

Published: 2026-05-26Modified: 2026-07-24

CVSS 3.xHIGH 7.1

CVSS:3.x/CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N

References

CVE-2026-42013

HIGH8.2

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 attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.

Published: 2026-05-26Modified: 2026-07-24

CVSS 3.xHIGH 8.2

CVSS:3.x/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

References

CVE-2026-42014

MEDIUM6.6

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.

Published: 2026-06-15Modified: 2026-07-22

CVSS 3.xMEDIUM 6.6

CVSS:3.x/CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H

References

CVE-2026-42015

MEDIUM5.3

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 contains 32 elements. This memory corruption could lead to a denial of service (DoS) or potentially other unspecified impacts.

Published: 2026-05-26Modified: 2026-07-24

CVSS 3.xMEDIUM 5.3

CVSS:3.x/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

CVE-2026-5260

HIGH8.2

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 corruption vulnerability could lead to information disclosure.

Published: 2026-05-26Modified: 2026-07-24

CVSS 3.xHIGH 8.2

CVSS:3.x/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

References

CVE-2026-5419

LOW3.7

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 through observable timing differences. This vulnerability is a form of information disclosure.

Published: 2026-06-01Modified: 2026-07-22

CVSS 3.xLOW 3.7

CVSS:3.x/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References

Package update gnutls30 in branch p11

Closed issues (26)

Уязвимость функции check_ocsp_response() библиотеки GnuTLS, позволяющая нарушителю обойти существующие механизмы безопасности

Уязвимость функции compare_strings() библиотеки GnuTLS, позволяющая нарушителю получить несанкционированный доступ к защищаемой информации

Уязвимость функции parse_handshake_header() криптографической библиотеки GnuTLS, позволяющая нарушителю вызвать отказ в обслуживании

Уязвимость функции merge_handshake_packet() криптографической библиотеки GnuTLS, позволяющая нарушителю вызвать отказ в обслуживании

Уязвимость реализации протокола DTLS криптографической библиотеки GnuTLS, позволяющая нарушителю вызвать отказ в обслуживании

Уязвимость функции gnutls_pkcs12_bag_set_data() криптографической библиотеки GnuTLS, позволяющая нарушителю повредить память или вызвать отказ в обслуживании

Уязвимость функции gnutls_pkcs11_token_set_pin() файла lib/pkcs11_write.c b/lib/pkcs11_write.c криптографической библиотеки GnuTLS, позволяющая нарушителю вызвать отказ в обслуживании

Уязвимость функции gnutls_x509_crt_check_hostname2() файла lib/x509/hostname-verify.c криптографической библиотеки GnuTLS, позволяющая нарушителю выполнить атаку MITM

Уязвимость функции name_constraints_node_list_intersect() файла lib/x509/name_constraints.c:726-727 криптографической библиотеки GnuTLS, позволяющая нарушителю выполнить атаку MITM

Уязвимость криптографической библиотеки GnuTLS, связанная с выходом операции за границы буфера в памяти, позволяющая нарушителю раскрыть защищаемую информацию

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.

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 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 corruption vulnerability could lead to information disclosure.