An update for gnutls is now available for openEuler-20.03-LTS-SP4 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2026-2403 Final 1.0 1.0 2026-05-22 Initial 2026-05-22 2026-05-22 openEuler SA Tool V1.0 2026-05-22 gnutls security update An update for gnutls is now available for openEuler-20.03-LTS-SP4 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) An update for gnutls is now available for openEuler-20.03-LTS-SP4. openEuler Security has rated this update as having a security impact of critical. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section. Critical gnutls https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2403 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-42009 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-42010 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-42013 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-42014 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-42015 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-5260 https://nvd.nist.gov/vuln/detail/CVE-2026-42009 https://nvd.nist.gov/vuln/detail/CVE-2026-42010 https://nvd.nist.gov/vuln/detail/CVE-2026-42013 https://nvd.nist.gov/vuln/detail/CVE-2026-42014 https://nvd.nist.gov/vuln/detail/CVE-2026-42015 https://nvd.nist.gov/vuln/detail/CVE-2026-5260 openEuler-20.03-LTS-SP4 gnutls-3.6.14-22.oe2003sp4.aarch64.rpm gnutls-debuginfo-3.6.14-22.oe2003sp4.aarch64.rpm gnutls-debugsource-3.6.14-22.oe2003sp4.aarch64.rpm gnutls-devel-3.6.14-22.oe2003sp4.aarch64.rpm gnutls-utils-3.6.14-22.oe2003sp4.aarch64.rpm gnutls-3.6.14-22.oe2003sp4.src.rpm gnutls-3.6.14-22.oe2003sp4.x86_64.rpm gnutls-debuginfo-3.6.14-22.oe2003sp4.x86_64.rpm gnutls-debugsource-3.6.14-22.oe2003sp4.x86_64.rpm gnutls-devel-3.6.14-22.oe2003sp4.x86_64.rpm gnutls-utils-3.6.14-22.oe2003sp4.x86_64.rpm gnutls-help-3.6.14-22.oe2003sp4.noarch.rpm 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. 2026-05-22 CVE-2026-42009 openEuler-20.03-LTS-SP4 High 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H gnutls security update 2026-05-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2403 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. 2026-05-22 CVE-2026-42010 openEuler-20.03-LTS-SP4 Critical 9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H gnutls security update 2026-05-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2403 2026-05-22 CVE-2026-42013 openEuler-20.03-LTS-SP4 Medium 6.5 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N gnutls security update 2026-05-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2403 2026-05-22 CVE-2026-42014 openEuler-20.03-LTS-SP4 Medium 4.0 AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L gnutls security update 2026-05-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2403 2026-05-22 CVE-2026-42015 openEuler-20.03-LTS-SP4 Medium 6.1 AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H gnutls security update 2026-05-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2403 2026-05-22 CVE-2026-5260 openEuler-20.03-LTS-SP4 Medium 5.9 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H gnutls security update 2026-05-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2403