{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-28780", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-03-03T12:31:23.999Z", "datePublished": "2026-05-05T21:29:41.527Z", "dateUpdated": "2026-09-02T12:04:29.860Z" }, "containers": { "cna": { "affected": [ { "defaultStatus": "unaffected", "product": "Apache HTTP Server", "vendor": "Apache Software Foundation", "versions": [ { "lessThanOrEqual": "2.4.66", "status": "affected", "version": "0", "versionType": "semver" } ] } ], "credits": [ { "lang": "en", "type": "finder", "value": "Andrew Lacambra" }, { "lang": "en", "type": "finder", "value": "Elhanan Haenel" }, { "lang": "en", "type": "finder", "value": "Tianshuo Han ()" }, { "lang": "en", "type": "finder", "value": "Tristan Madani" } ], "descriptions": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "

Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server.
If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

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"UNKNOWN" }, "timeline": [ { "lang": "en", "time": "2026-02-04T12:00:00.000Z", "value": "reported" }, { "lang": "en", "time": "2026-03-18T12:00:00.000Z", "value": "reported by 3rd finder" }, { "lang": "en", "time": "2026-02-28T12:00:00.000Z", "value": "reported by 2nd finder" } ], "title": "Apache HTTP Server: buffer overflow in mod_proxy_ajp via ajp_msg_check_header()", "x_generator": { "engine": "Vulnogram 0.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "http://www.openwall.com/lists/oss-security/2026/05/05/9" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-05-05T22:24:30.623Z" } }, { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", 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