An update for glibc is now available for openEuler-24.03-LTS-SP1 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2026-1803 Final 1.0 1.0 2026-04-03 Initial 2026-04-03 2026-04-03 openEuler SA Tool V1.0 2026-04-03 glibc security update An update for glibc is now available for openEuler-24.03-LTS-SP1 The GNU C Library project provides the core libraries for the GNU system and GNU/Linux systems, as well as many other systems that use Linux as the kernel. These libraries provide critical APIs including ISO C11, POSIX.1-2008, BSD, OS-specific APIs and more. These APIs include such foundational facilities as open, read, write, malloc, printf, getaddrinfo, dlopen, pthread_create, crypt, login, exit and more. Security Fix(es): Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C Library version 2.34 to version 2.43 could, with a crafted response from the configured DNS server, result in a violation of the DNS specification that causes the application to treat a non-answer section of the DNS response as a valid answer.(CVE-2026-4437) Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C library version 2.34 to version 2.43 could result in an invalid DNS hostname being returned to the caller in violation of the DNS specification.(CVE-2026-4438) An update for glibc is now available for openEuler-24.03-LTS-SP1. openEuler Security has rated this update as having a security impact of high. 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. High glibc https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1803 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-4437 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-4438 https://nvd.nist.gov/vuln/detail/CVE-2026-4437 https://nvd.nist.gov/vuln/detail/CVE-2026-4438 openEuler-24.03-LTS-SP1 glibc-2.38-98.oe2403sp1.aarch64.rpm glibc-all-langpacks-2.38-98.oe2403sp1.aarch64.rpm glibc-common-2.38-98.oe2403sp1.aarch64.rpm glibc-debuginfo-2.38-98.oe2403sp1.aarch64.rpm glibc-debugsource-2.38-98.oe2403sp1.aarch64.rpm glibc-debugutils-2.38-98.oe2403sp1.aarch64.rpm glibc-devel-2.38-98.oe2403sp1.aarch64.rpm glibc-locale-archive-2.38-98.oe2403sp1.aarch64.rpm glibc-locale-source-2.38-98.oe2403sp1.aarch64.rpm glibc-nss-devel-2.38-98.oe2403sp1.aarch64.rpm libnsl-2.38-98.oe2403sp1.aarch64.rpm nscd-2.38-98.oe2403sp1.aarch64.rpm nss_modules-2.38-98.oe2403sp1.aarch64.rpm glibc-2.38-98.oe2403sp1.src.rpm glibc-2.38-98.oe2403sp1.x86_64.rpm glibc-all-langpacks-2.38-98.oe2403sp1.x86_64.rpm glibc-common-2.38-98.oe2403sp1.x86_64.rpm glibc-debuginfo-2.38-98.oe2403sp1.x86_64.rpm glibc-debugsource-2.38-98.oe2403sp1.x86_64.rpm glibc-debugutils-2.38-98.oe2403sp1.x86_64.rpm glibc-devel-2.38-98.oe2403sp1.x86_64.rpm glibc-locale-archive-2.38-98.oe2403sp1.x86_64.rpm glibc-locale-source-2.38-98.oe2403sp1.x86_64.rpm glibc-nss-devel-2.38-98.oe2403sp1.x86_64.rpm libnsl-2.38-98.oe2403sp1.x86_64.rpm nscd-2.38-98.oe2403sp1.x86_64.rpm nss_modules-2.38-98.oe2403sp1.x86_64.rpm glibc-help-2.38-98.oe2403sp1.noarch.rpm Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C Library version 2.34 to version 2.43 could, with a crafted response from the configured DNS server, result in a violation of the DNS specification that causes the application to treat a non-answer section of the DNS response as a valid answer. 2026-04-03 CVE-2026-4437 openEuler-24.03-LTS-SP1 High 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H glibc security update 2026-04-03 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1803 Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C library version 2.34 to version 2.43 could result in an invalid DNS hostname being returned to the caller in violation of the DNS specification. 2026-04-03 CVE-2026-4438 openEuler-24.03-LTS-SP1 Medium 5.4 AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N glibc security update 2026-04-03 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1803