{"id":"CVE-2026-42536","title":"Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content\n\nThis issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.\n\nUsers are recommended to upgrade to version 2.4.68…","summary":"Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content\n\nThis issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.\n\nUsers are recommended to upgrade to version 2.4.68…","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-122","CWE-120"],"vendor":"apache","product":"http_server","affected":["http_server >= 2.4.0, < 2.4.68"],"patched":["http_server 2.4.68"],"published":"2026-06-08","updated":"2026-09-14","sourceUpdated":"2026-09-14T13:18:36.300","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-42536","references":[{"url":"https://httpd.apache.org/security/vulnerabilities_24.html","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/06/08/9","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2026:25042","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:34109","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:41906","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:42828","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:47046","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:53371","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:56868","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:56869","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:62165","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:66323","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:67152","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-42536","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2486411","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42536.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-42536"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42536"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-06-08T18:09:39.478431Z"},"epss":0.01024,"epssPercentile":0.61529,"exploits":{"github":1,"githubRepos":["https://github.com/erberkan/CVE-2026-42536-PoC"],"checkedAt":"2026-09-21T15:28:54.621Z"},"exploitAvailable":true,"ingestedAt":"2026-07-16T12:53:56.307Z","slug":"CVE-2026-42536","body":"## Overview\n\nHeap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content\n\nThis issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.\n\nUsers are recommended to upgrade to version 2.4.68, which fixes the issue.\n\n## Affected\n\n- `http_server >= 2.4.0, < 2.4.68`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `http_server 2.4.68`\n\n## Vendor advisories\n\n- **RHSA-2026:56868** · Red Hat · fixed in: Red Hat JBoss Core Services on RHEL 8 · released 2026-08-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:56868)\n- **RHSA-2026:47046** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-07-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:47046)\n- **RHSA-2026:34109** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-07-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:34109)\n- **RHSA-2026:42828** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-07-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:42828)\n- **RHSA-2026:66323** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66323)\n- **RHSA-2026:62165** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-09-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:62165)\n- **RHSA-2026:41906** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-07-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:41906)\n- **RHSA-2026:25042** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-06-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:25042)\n- **RHSA-2026:53371** · Red Hat · fixed in: Red Hat Insights proxy 1.5 · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53371)\n- **RHSA-2026:56869** · Red Hat · fixed in: Red Hat JBoss Core Services 2.4.62.SP5 · released 2026-08-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:56869)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42536.json)\n- **RHSA-2026:67152** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67152)","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.2,"exploitation":12,"ransomware":0},"changes":[{"seq":201645,"id":"CVE-2026-42536","ts":1789399580613,"field":"exploit_available","old":"false","new":"true"},{"seq":200377,"id":"CVE-2026-42536","ts":1789397181396,"field":"exploit_available","old":"true","new":"false"},{"seq":198301,"id":"CVE-2026-42536","ts":1789391811222,"field":"exploit_available","old":"false","new":"true"},{"seq":196094,"id":"CVE-2026-42536","ts":1789383456372,"field":"exploit_available","old":"true","new":"false"},{"seq":195023,"id":"CVE-2026-42536","ts":1789380354514,"field":"exploit_available","old":"false","new":"true"},{"seq":193810,"id":"CVE-2026-42536","ts":1789378319509,"field":"exploit_available","old":"true","new":"false"},{"seq":192597,"id":"CVE-2026-42536","ts":1789376301692,"field":"exploit_available","old":"false","new":"true"},{"seq":191384,"id":"CVE-2026-42536","ts":1789373212049,"field":"exploit_available","old":"true","new":"false"},{"seq":190169,"id":"CVE-2026-42536","ts":1789369192423,"field":"exploit_available","old":"false","new":"true"},{"seq":188956,"id":"CVE-2026-42536","ts":1789368074323,"field":"exploit_available","old":"true","new":"false"},{"seq":187739,"id":"CVE-2026-42536","ts":1789365048493,"field":"exploit_available","old":"false","new":"true"},{"seq":186526,"id":"CVE-2026-42536","ts":1789363067082,"field":"exploit_available","old":"true","new":"false"},{"seq":185312,"id":"CVE-2026-42536","ts":1789361005865,"field":"exploit_available","old":"false","new":"true"},{"seq":184099,"id":"CVE-2026-42536","ts":1789357991698,"field":"exploit_available","old":"true","new":"false"},{"seq":183318,"id":"CVE-2026-42536","ts":1789355988421,"field":"exploit_available","old":"false","new":"true"}]}