{"id":"CVE-2026-76956","title":"In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.","summary":"In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-394","CWE-331"],"vendor":"libexpat_project","product":"libexpat","affected":["libexpat >= 2.8.2, < 2.8.4"],"patched":["libexpat 2.8.4"],"published":"2026-08-20","updated":"2026-09-08","sourceUpdated":"2026-09-08T21:08:20.697","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-76956","references":[{"url":"https://github.com/libexpat/libexpat/pull/1326","label":"cve@mitre.org"},{"url":"https://github.com/libexpat/libexpat/pull/1329","label":"cve@mitre.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76956.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-76956"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2520124"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-76956"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76956"},{"url":"https://access.redhat.com/errata/RHSA-2026:60451"}],"tags":["nvd","csaf","vex","red-hat"],"epss":0.00287,"epssPercentile":0.21549,"ingestedAt":"2026-09-08T21:11:12.284Z","slug":"CVE-2026-76956","body":"## Overview\n\nIn libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.\n\n## Affected\n\n- `libexpat >= 2.8.2, < 2.8.4`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `libexpat 2.8.4`\n\n## Vendor advisories\n\n- **RHSA-2026:60451** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-27 · [advisory](https://access.redhat.com/errata/RHSA-2026:60451)","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}