{"id":"OESA-2026-1802","summary":"glibc security update","details":"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.\r\n\r\nSecurity Fix(es):\n\nCalling 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)\n\nCalling 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)","modified":"2026-08-18T01:19:45.812887619Z","published":"2026-04-03T11:10:49Z","upstream":["CVE-2026-4437","CVE-2026-4438"],"database_specific":{"severity":"High"},"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1802"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4437"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4438"}],"affected":[{"package":{"name":"glibc","ecosystem":"openEuler:24.03-LTS","purl":"pkg:rpm/openEuler/glibc&distro=openEuler-24.03-LTS"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.38-98.oe2403"}]}],"ecosystem_specific":{"x86_64":["glibc-2.38-98.oe2403.x86_64.rpm","glibc-all-langpacks-2.38-98.oe2403.x86_64.rpm","glibc-common-2.38-98.oe2403.x86_64.rpm","glibc-debuginfo-2.38-98.oe2403.x86_64.rpm","glibc-debugsource-2.38-98.oe2403.x86_64.rpm","glibc-debugutils-2.38-98.oe2403.x86_64.rpm","glibc-devel-2.38-98.oe2403.x86_64.rpm","glibc-locale-archive-2.38-98.oe2403.x86_64.rpm","glibc-locale-source-2.38-98.oe2403.x86_64.rpm","glibc-nss-devel-2.38-98.oe2403.x86_64.rpm","libnsl-2.38-98.oe2403.x86_64.rpm","nscd-2.38-98.oe2403.x86_64.rpm","nss_modules-2.38-98.oe2403.x86_64.rpm"],"aarch64":["glibc-2.38-98.oe2403.aarch64.rpm","glibc-all-langpacks-2.38-98.oe2403.aarch64.rpm","glibc-common-2.38-98.oe2403.aarch64.rpm","glibc-debuginfo-2.38-98.oe2403.aarch64.rpm","glibc-debugsource-2.38-98.oe2403.aarch64.rpm","glibc-debugutils-2.38-98.oe2403.aarch64.rpm","glibc-devel-2.38-98.oe2403.aarch64.rpm","glibc-locale-archive-2.38-98.oe2403.aarch64.rpm","glibc-locale-source-2.38-98.oe2403.aarch64.rpm","glibc-nss-devel-2.38-98.oe2403.aarch64.rpm","libnsl-2.38-98.oe2403.aarch64.rpm","nscd-2.38-98.oe2403.aarch64.rpm","nss_modules-2.38-98.oe2403.aarch64.rpm"],"noarch":["glibc-help-2.38-98.oe2403.noarch.rpm"],"src":["glibc-2.38-98.oe2403.src.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2026-1802.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}