{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42536", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-04-28T16:06:25.760Z", "datePublished": "2026-06-08T15:23:46.290Z", "dateUpdated": "2026-06-08T22:32:27.355Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Apache HTTP Server", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "2.4.67", "status": "affected", "version": "2.4.0", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Zhenpeng (Leo) Lin at depthfirst"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Heap-based Buffer Overflow vulnerability in Apache HTTP Server with&nbsp;mod_xml2enc, xml2StartParse, and untrusted content</p><p>This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.</p><p>Users are recommended to upgrade to version 2.4.68, which fixes the issue.</p>"}], "value": "Heap-based Buffer Overflow vulnerability in Apache HTTP Server with\u00a0mod_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."}], "metrics": [{"other": {"content": {"text": "low"}, "type": "Textual description of severity"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-122", "description": "CWE-122 Heap-based Buffer Overflow", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-06-08T15:23:46.290Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://httpd.apache.org/security/vulnerabilities_24.html"}], "source": {"discovery": "UNKNOWN"}, "timeline": [{"lang": "en", "time": "2026-04-27T12:00:00.000Z", "value": "reported"}, {"lang": "en", "time": "2026-06-04T12:00:00.000Z", "value": "fixed in 2.4.x by r1934971"}, {"lang": "eng", "time": "2026-06-08T12:00:00.000Z", "value": "2.4.68 released"}], "title": "Apache HTTP Server: mod_xml2enc heap overflow", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-06-08T18:09:39.478431Z", "id": "CVE-2026-42536", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-08T18:10:10.372Z"}}, {"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/06/08/9"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-06-08T22:32:27.355Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/06/08/9"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-06-08T22:32:27.355Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-42536", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-08T18:09:39.478431Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-08T18:10:03.857Z"}}], "cna": {"title": "Apache HTTP Server: mod_xml2enc heap overflow", "source": {"discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "finder", "value": "Zhenpeng (Leo) Lin at depthfirst"}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "low"}}}], "affected": [{"vendor": "Apache Software Foundation", "product": "Apache HTTP Server", "versions": [{"status": "affected", "version": "2.4.0", "versionType": "semver", "lessThanOrEqual": "2.4.67"}], "defaultStatus": "unaffected"}], "timeline": [{"lang": "en", "time": "2026-04-27T12:00:00.000Z", "value": "reported"}, {"lang": "en", "time": "2026-06-04T12:00:00.000Z", "value": "fixed in 2.4.x by r1934971"}, {"lang": "eng", "time": "2026-06-08T12:00:00.000Z", "value": "2.4.68 released"}], "references": [{"url": "https://httpd.apache.org/security/vulnerabilities_24.html", "tags": ["vendor-advisory"]}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "descriptions": [{"lang": "en", "value": "Heap-based Buffer Overflow vulnerability in Apache HTTP Server with\u00a0mod_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.", "supportingMedia": [{"type": "text/html", "value": "<p>Heap-based Buffer Overflow vulnerability in Apache HTTP Server with&nbsp;mod_xml2enc, xml2StartParse, and untrusted content</p><p>This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.</p><p>Users are recommended to upgrade to version 2.4.68, which fixes the issue.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-122", "description": "CWE-122 Heap-based Buffer Overflow"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-06-08T15:23:46.290Z"}}}, "cveMetadata": {"cveId": "CVE-2026-42536", "state": "PUBLISHED", "dateUpdated": "2026-06-08T22:32:27.355Z", "dateReserved": "2026-04-28T16:06:25.760Z", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "datePublished": "2026-06-08T15:23:46.290Z", "assignerShortName": "apache"}, "dataVersion": "5.2"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "03F07E89-F9BF-4913-8250-F79447AA6EBD", "versionEndExcluding": "2.4.68", "versionStartIncluding": "2.4.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Heap-based Buffer Overflow vulnerability in Apache HTTP Server with\u00a0mod_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."}], "id": "CVE-2026-42536", "lastModified": "2026-06-09T15:55:19.853", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-06-08T16:16:39.263", "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/2026/06/08/9"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "security@apache.org", "type": "Secondary"}]}

{"bugzilla": {"description": "httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc", "id": "2486411", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486411"}, "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-120", "details": ["Heap-based Buffer Overflow vulnerability in Apache HTTP Server with\u00a0mod_xml2enc, xml2StartParse, and untrusted content\nThis issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.\nUsers are recommended to upgrade to version 2.4.68, which fixes the issue.", "A flaw was found in Apache HTTP Server, specifically within the mod_xml2enc module. This heap-based buffer overflow vulnerability can be triggered when processing untrusted content through the xml2StartParse function. A remote attacker could potentially exploit this to cause a denial of service, information disclosure, or possibly arbitrary code execution."], "mitigation": {"lang": "en:us", "value": "To mitigate this vulnerability, disable the `mod_xml2enc` module if its functionality for XML internationalization is not essential. This can be done by commenting out the `LoadModule xml2enc_module modules/mod_xml2enc.so` directive in the Apache HTTP Server configuration. A service restart is required for the change to take effect.\n```bash\n# Edit the Apache configuration file, e.g., /etc/httpd/conf.modules.d/00-base.conf\n# Comment out the line:\n# LoadModule xml2enc_module modules/mod_xml2enc.so\n# Reload the httpd service\nsudo systemctl reload httpd\n```\n*Note: Disabling `mod_xml2enc` will cause any configurations relying heavily on `mod_proxy_html` or raw HTML/XML encoding conversions to function incorrectly or fail. Red Hat strongly recommends upgrading to a patched version of `httpd` as soon as it becomes available for your specific RHEL channel.*"}, "name": "CVE-2026-42536", "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", "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"}], "public_date": "2026-06-08T15:23:46Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-42536\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-42536\nhttps://httpd.apache.org/security/vulnerabilities_24.html"], "statement": "In Red Hat Enterprise Linux (RHEL), the httpd package includes mod_xml2enc, which provides encoding support for filters like mod_proxy_html. Because this flaw relies on processing unvetted or untrusted input text lengths, the impact presents a high risk to availability (Denial of Service via worker crashes) and a potential risk to confidentiality if an attacker is capable of executing remote code within the context of the apache or httpd daemon process.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.4.0,2.4.67]"}}], "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": "http_server", "vendor": "apache"}], "created": "2026-06-08T16:30:06.601623+00:00", "updated": "2026-06-19T01:30:16.174199+00:00", "vendors": ["apache", "apache$PRODUCT$http_server"]}