CVE-2026-33857

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Apache HTTP Server", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "2.4.66", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "security@apache.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "8FF781BA-CF81-400B-A155-4DAE0BD856EE", "versionEndExcluding": "2.4.67", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Out-of-bounds Read vulnerability in mod_proxy_ajp of \n\nApache HTTP Server.\n\nThis issue affects Apache HTTP Server: through 2.4.66.\n\nUsers are recommended to upgrade to version 2.4.67, which fixes the issue."}, {"lang": "es", "value": "Vulnerabilidad de lectura fuera de l\u00edmites en mod_proxy_ajp de Servidor HTTP Apache.\n\nEste problema afecta a Servidor HTTP Apache: hasta la versi\u00f3n 2.4.66.\n\nSe recomienda a los usuarios actualizar a la versi\u00f3n 2.4.67, que corrige el problema."}], "id": "CVE-2026-33857", "lastModified": "2026-10-26T19:10:00.163", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33857", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-04T13:58:58.653462Z", "version": "2.0.3"}}]}, "published": "2026-05-04T14:16:33.253", "references": [{"source": "security@apache.org", "tags": ["Vendor Advisory"], "url": "https://httpd.apache.org/security/vulnerabilities_24.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2026/05/04/15"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "security@apache.org", "type": "Secondary"}]}

{"bugzilla": {"description": "httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions", "id": "2464953", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464953"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the mod_proxy_ajp module of httpd. When processing AJP (Apache JServ Protocol) messages, the AJP getter functions attempt to read data beyond the allocated buffer size, allowing an attacker or a malformed request to cause an out-of-bounds read. This issue leads to a denial of service."], "mitigation": {"lang": "en:us", "value": "Disabling mod_proxy_ajp and restarting httpd will mitigate this flaw."}, "name": "CVE-2026-33857", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "httpd:2.4/httpd", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Affected", "package_name": "mod_proxy_ajp.so", "product_name": "Red Hat JBoss Core Services"}], "public_date": "2026-05-04T13:07:30Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-33857\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33857\nhttps://httpd.apache.org/security/vulnerabilities_24.html"], "statement": "To exploit this issue, the Apache HTTP Server must be configured to connect to an untrusted or compromised AJP backend server, limiting its exposure. Due to this reason, this flaw has been rated with a moderate severity.\nThis flaw only affects configurations with mod_proxy_ajp loaded and being used. This module can be disabled via the configuration file if its functionality is not being used.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,2.4.66]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Apache HTTP Server", "source": "cna", "vendor": "Apache Software Foundation"}, "product": "apache_http_server", "vendor": "apache"}], "created": "2026-05-04T14:45:01.993375+00:00", "updated": "2026-05-04T16:00:04.321343+00:00", "vendors": ["apache", "apache$PRODUCT$apache_http_server"]}