{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42945", "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "state": "PUBLISHED", "assignerShortName": "f5", "dateReserved": "2026-04-30T23:04:27.955Z", "datePublished": "2026-05-13T14:12:43.971Z", "dateUpdated": "2026-05-13T16:07:23.891Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unknown", "modules": ["ngx_http_rewrite_module"], "product": "NGINX Plus", "vendor": "F5", "versions": [{"lessThan": "*", "status": "unaffected", "version": "R37", "versionType": "custom"}, {"lessThan": "R36 P4", "status": "affected", "version": "R36", "versionType": "custom"}, {"lessThan": "R32 P6", "status": "affected", "version": "R32", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "modules": ["ngx_http_rewrite_module"], "product": "NGINX Open Source", "vendor": "F5", "versions": [{"lessThan": "*", "status": "unaffected", "version": "1.31.0", "versionType": "semver"}, {"lessThan": "1.30.1", "status": "affected", "version": "0.6.27", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "finder", "value": "F5 acknowledges Zhenpeng (Leo) Lin of depthfirst for bringing this issue to our attention and following the highest standards of coordinated disclosure."}], "datePublic": "2026-05-13T14:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<span style=\"background-color: rgb(255, 255, 255);\">NGINX Plus and NGINX Open Source have a vulnerability in the </span><strong>ngx_http_rewrite_module</strong><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;module. This vulnerability exists when the </span><strong>rewrite</strong><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;directive is followed by a </span><strong>rewrite</strong><span style=\"background-color: rgb(255, 255, 255);\">, </span><strong>if</strong><span style=\"background-color: rgb(255, 255, 255);\">, or </span><strong>set</strong><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, for systems with Address Space Layout Randomization (ASLR ) disabled, code execution is possible.</span>&nbsp; Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "value": "NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module\u00a0module. This vulnerability exists when the rewrite\u00a0directive is followed by a rewrite, if, or set\u00a0directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, for systems with Address Space Layout Randomization (ASLR ) disabled, code execution is possible.\u00a0 Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 9.2, "baseSeverity": "CRITICAL", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-122", "description": "CWE-122 Heap-based Buffer Overflow.", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "shortName": "f5", "dateUpdated": "2026-05-13T14:12:43.971Z"}, "references": [{"tags": ["vendor-advisory", "patch"], "url": "https://my.f5.com/manage/s/article/K000161019"}], "source": {"discovery": "EXTERNAL"}, "title": "NGINX ngx_http_rewrite_module vulnerability", "x_generator": {"engine": "F5 SIRTBot v1.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-13T15:55:27.731844Z", "id": "CVE-2026-42945", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-13T16:07:23.891Z"}}]}}

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42945", "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "state": "PUBLISHED", "assignerShortName": "f5", "dateReserved": "2026-04-30T23:04:27.955Z", "datePublished": "2026-05-13T14:12:43.971Z", "dateUpdated": "2026-05-13T16:07:23.891Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unknown", "modules": ["ngx_http_rewrite_module"], "product": "NGINX Plus", "vendor": "F5", "versions": [{"lessThan": "*", "status": "unaffected", "version": "R37", "versionType": "custom"}, {"lessThan": "R36 P4", "status": "affected", "version": "R36", "versionType": "custom"}, {"lessThan": "R32 P6", "status": "affected", "version": "R32", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "modules": ["ngx_http_rewrite_module"], "product": "NGINX Open Source", "vendor": "F5", "versions": [{"lessThan": "*", "status": "unaffected", "version": "1.31.0", "versionType": "semver"}, {"lessThan": "1.30.1", "status": "affected", "version": "0.6.27", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "finder", "value": "F5 acknowledges Zhenpeng (Leo) Lin of depthfirst for bringing this issue to our attention and following the highest standards of coordinated disclosure."}], "datePublic": "2026-05-13T14:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<span style=\"background-color: rgb(255, 255, 255);\">NGINX Plus and NGINX Open Source have a vulnerability in the </span><strong>ngx_http_rewrite_module</strong><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;module. 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