{"id":"CVE-2026-63686","title":"A NULL pointer dereference in mod_xml2enc in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an untrusted backend server to cause a denial of service via a proxied response with a charset whose convers…","summary":"A NULL pointer dereference in mod_xml2enc in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an untrusted backend server to cause a denial of service via a proxied response with a charset whose convers…","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-476"],"vendor":"apache","product":"http_server","affected":["http_server >= 2.4.0, < 2.4.69"],"patched":["http_server 2.4.69"],"published":"2026-10-01","updated":"2026-10-05","sourceUpdated":"2026-10-05T17:46:24.750","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63686","references":[{"url":"https://httpd.apache.org/security/vulnerabilities_24.html","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/10/01/25","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63686.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-63686"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2544852"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63686"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63686"},{"url":"https://access.redhat.com/errata/RHSA-2026:74858"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.0046,"epssPercentile":0.39723,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-01T19:34:34.341515Z"},"ingestedAt":"2026-10-01T18:55:42.364Z","slug":"CVE-2026-63686","body":"## Overview\n\nA NULL pointer dereference in mod_xml2enc in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an untrusted backend server to cause a denial of service via a proxied response with a charset whose conversion partially succeeds then fails.\n\nUsers are recommended to upgrade to version 2.4.69, which fixes this issue.\n\n## Affected\n\n- `http_server >= 2.4.0, < 2.4.69`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `http_server 2.4.69`\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Hardened Images · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-02 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63686.json)\n- **RHSA-2026:74858** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:74858)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":214661,"id":"CVE-2026-63686","ts":1790884800351,"field":"cvss","old":null,"new":"7.5"},{"seq":214660,"id":"CVE-2026-63686","ts":1790884800351,"field":"severity","old":"none","new":"high"}]}