{"id":"CVE-2026-44673","title":"libyang is a YANG data modeling language library","summary":"libyang is a YANG data modeling language library. Prior to SO 5.2.15, lyb_read_string() in src/parser_lyb.c contains an integer overflow that results in a heap buffer overflow when parsing a maliciously crafted LYB binary blob. An attack…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-190"],"vendor":"CESNET","product":"libyang","affected":["libyang < SO 5.2.15"],"patched":["enterprise_linux_appstream_eus_v_10_0","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_8","enterprise_linux_appstream_aus_v_8_4","enterprise_linux_appstream_eus_extension_v_8_4","enterprise_linux_appstream_aus_v_8_6","enterprise_linux_appstream_eus_extension_v_8_6","enterprise_linux_appstream_e4s_v_8_8","enterprise_linux_appstream_tus_v_8_8","enterprise_linux_appstream_e4s_v_9_4","enterprise_linux_appstream_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_codeready_linux_builder_v_9"],"published":"2026-05-14","updated":"2026-09-09","sourceUpdated":"2026-09-09T13:20:11.590","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-44673","references":[{"url":"https://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh","label":"security-advisories@github.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:24545","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:24758","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:25051","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:49666","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:51339","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:51351","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:51368","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:65467","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:65477","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:65508","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-44673","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477617","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44673.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-44673"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44673"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-05-15T14:18:31.145491Z"},"epss":0.00539,"epssPercentile":0.44099,"ingestedAt":"2026-08-07T13:14:10.235Z","slug":"CVE-2026-44673","body":"## Overview\n\nlibyang is a YANG data modeling language library. Prior to SO 5.2.15, lyb_read_string() in src/parser_lyb.c contains an integer overflow that results in a heap buffer overflow when parsing a maliciously crafted LYB binary blob. An attacker who can supply LYB data to any libyang consumer (NETCONF server, sysrepo, etc.) can trigger a crash or potential heap corruption. This vulnerability is fixed in SO 5.2.15.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:49666** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-08-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:49666)\n- **RHSA-2026:24758** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-06-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:24758)\n- **RHSA-2026:24545** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-06-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:24545)\n- **RHSA-2026:51351** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-08-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:51351)\n- **RHSA-2026:51368** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-08-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:51368)\n- **RHSA-2026:51339** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-08-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:51339)\n- **RHSA-2026:65467** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65467)\n- **RHSA-2026:25051** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-06-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:25051)\n- **RHSA-2026:65508** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65508)\n- **RHSA-2026:65477** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65477)","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":201663,"id":"CVE-2026-44673","ts":1789399584789,"field":"exploit_available","old":"false","new":"true"},{"seq":200395,"id":"CVE-2026-44673","ts":1789397208188,"field":"exploit_available","old":"true","new":"false"},{"seq":198319,"id":"CVE-2026-44673","ts":1789391830750,"field":"exploit_available","old":"false","new":"true"},{"seq":196112,"id":"CVE-2026-44673","ts":1789383478575,"field":"exploit_available","old":"true","new":"false"},{"seq":195041,"id":"CVE-2026-44673","ts":1789380356513,"field":"exploit_available","old":"false","new":"true"},{"seq":193828,"id":"CVE-2026-44673","ts":1789378326152,"field":"exploit_available","old":"true","new":"false"},{"seq":192615,"id":"CVE-2026-44673","ts":1789376303732,"field":"exploit_available","old":"false","new":"true"},{"seq":191402,"id":"CVE-2026-44673","ts":1789373239068,"field":"exploit_available","old":"true","new":"false"},{"seq":190187,"id":"CVE-2026-44673","ts":1789369195851,"field":"exploit_available","old":"false","new":"true"},{"seq":188974,"id":"CVE-2026-44673","ts":1789368098850,"field":"exploit_available","old":"true","new":"false"},{"seq":187757,"id":"CVE-2026-44673","ts":1789365053188,"field":"exploit_available","old":"false","new":"true"},{"seq":186544,"id":"CVE-2026-44673","ts":1789363091307,"field":"exploit_available","old":"true","new":"false"},{"seq":185330,"id":"CVE-2026-44673","ts":1789361011528,"field":"exploit_available","old":"false","new":"true"},{"seq":184117,"id":"CVE-2026-44673","ts":1789358002846,"field":"exploit_available","old":"true","new":"false"},{"seq":182368,"id":"CVE-2026-44673","ts":1789354153797,"field":"exploit_available","old":"false","new":"true"},{"seq":181161,"id":"CVE-2026-44673","ts":1789352996563,"field":"exploit_available","old":"true","new":"false"},{"seq":179954,"id":"CVE-2026-44673","ts":1789350064797,"field":"exploit_available","old":"false","new":"true"},{"seq":178747,"id":"CVE-2026-44673","ts":1789347931653,"field":"exploit_available","old":"true","new":"false"},{"seq":177540,"id":"CVE-2026-44673","ts":1789346217181,"field":"exploit_available","old":"false","new":"true"},{"seq":176333,"id":"CVE-2026-44673","ts":1789342836583,"field":"exploit_available","old":"true","new":"false"},{"seq":175787,"id":"CVE-2026-44673","ts":1789338620869,"field":"exploit_available","old":"false","new":"true"},{"seq":175657,"id":"CVE-2026-44673","ts":1789338462525,"field":"exploit_available","old":"true","new":"false"},{"seq":174452,"id":"CVE-2026-44673","ts":1789334641144,"field":"exploit_available","old":"false","new":"true"},{"seq":173247,"id":"CVE-2026-44673","ts":1789333317548,"field":"exploit_available","old":"true","new":"false"},{"seq":172061,"id":"CVE-2026-44673","ts":1789330938952,"field":"exploit_available","old":"false","new":"true"},{"seq":170875,"id":"CVE-2026-44673","ts":1789328456486,"field":"exploit_available","old":"true","new":"false"},{"seq":169670,"id":"CVE-2026-44673","ts":1789326964333,"field":"exploit_available","old":"false","new":"true"},{"seq":168465,"id":"CVE-2026-44673","ts":1789323528339,"field":"exploit_available","old":"true","new":"false"},{"seq":167260,"id":"CVE-2026-44673","ts":1789319422100,"field":"exploit_available","old":"false","new":"true"},{"seq":166055,"id":"CVE-2026-44673","ts":1789318389598,"field":"exploit_available","old":"true","new":"false"},{"seq":164850,"id":"CVE-2026-44673","ts":1789315610280,"field":"exploit_available","old":"false","new":"true"},{"seq":163645,"id":"CVE-2026-44673","ts":1789313327841,"field":"exploit_available","old":"true","new":"false"},{"seq":162440,"id":"CVE-2026-44673","ts":1789311750150,"field":"exploit_available","old":"false","new":"true"},{"seq":161235,"id":"CVE-2026-44673","ts":1789308352055,"field":"exploit_available","old":"true","new":"false"},{"seq":160740,"id":"CVE-2026-44673","ts":1789304279125,"field":"exploit_available","old":"false","new":"true"},{"seq":158578,"id":"CVE-2026-44673","ts":1789299345321,"field":"exploit_available","old":"true","new":"false"},{"seq":157542,"id":"CVE-2026-44673","ts":1789296502303,"field":"exploit_available","old":"false","new":"true"},{"seq":156337,"id":"CVE-2026-44673","ts":1789294453460,"field":"exploit_available","old":"true","new":"false"},{"seq":155132,"id":"CVE-2026-44673","ts":1789292699787,"field":"exploit_available","old":"false","new":"true"},{"seq":153927,"id":"CVE-2026-44673","ts":1789289430282,"field":"exploit_available","old":"true","new":"false"},{"seq":152577,"id":"CVE-2026-44673","ts":1789281313729,"field":"exploit_available","old":"false","new":"true"},{"seq":150139,"id":"CVE-2026-44673","ts":1789275897155,"field":"exploit_available","old":"true","new":"false"},{"seq":149106,"id":"CVE-2026-44673","ts":1789273613293,"field":"exploit_available","old":"false","new":"true"},{"seq":148073,"id":"CVE-2026-44673"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