CVE-2026-45728

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-45728", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-13T05:51:48.667Z", "datePublished": "2026-05-26T16:38:50.435Z", "dateUpdated": "2026-05-26T17:31:40.280Z"}, "containers": {"cna": {"title": "Algernon: Single-file mode unconditionally enables debug mode", "problemTypes": [{"descriptions": [{"cweId": "CWE-209", "lang": "en", "description": "CWE-209: Generation of Error Message Containing Sensitive Information", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-489", "lang": "en", "description": "CWE-489: Active Debug Code", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-540", "lang": "en", "description": "CWE-540: Inclusion of Sensitive Information in Source Code", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-1188", "lang": "en", "description": "CWE-1188: Insecure Default Initialization of Resource", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/xyproto/algernon/security/advisories/GHSA-fwqx-8365-9983", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/xyproto/algernon/security/advisories/GHSA-fwqx-8365-9983"}], "affected": [{"vendor": "xyproto", "product": "algernon", "versions": [{"version": "< 1.17.7", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-26T16:38:50.435Z"}, "descriptions": [{"lang": "en", "value": "Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, when Algernon is invoked with a single file path instead of a directory, singleFileMode is set to true and debugMode is forcibly enabled. debugMode activates the PrettyError renderer, which on any Lua or template error response dumps the absolute path of the file that errored, complete byte contents of that file, and exception or parser error text. This response is served with HTTP 200 OK to whoever sent the request that triggered the error. Any client able to reach the server and able to provoke a runtime error in the served script obtains the full server-side source of that script and of any sibling Lua data file consulted during the request. This vulnerability is fixed in 1.17.7."}], "source": {"advisory": "GHSA-fwqx-8365-9983", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/xyproto/algernon/security/advisories/GHSA-fwqx-8365-9983", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-26T17:31:16.231606Z", "id": "CVE-2026-45728", "options": [{"Exploitation": "poc"}, {"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": "2026-05-26T17:31:40.280Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-45728", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-26T17:31:16.231606Z"}}}], "references": [{"url": "https://github.com/xyproto/algernon/security/advisories/GHSA-fwqx-8365-9983", "tags": ["exploit"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-26T17:30:50.618Z"}}], "cna": {"title": "Algernon: Single-file mode unconditionally enables debug mode", "source": {"advisory": "GHSA-fwqx-8365-9983", "discovery": "UNKNOWN"}, "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:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}], "affected": [{"vendor": "xyproto", "product": "algernon", "versions": [{"status": "affected", "version": "< 1.17.7"}]}], "references": [{"url": "https://github.com/xyproto/algernon/security/advisories/GHSA-fwqx-8365-9983", "name": "https://github.com/xyproto/algernon/security/advisories/GHSA-fwqx-8365-9983", "tags": ["x_refsource_CONFIRM"]}], "descriptions": [{"lang": "en", "value": "Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, when Algernon is invoked with a single file path instead of a directory, singleFileMode is set to true and debugMode is forcibly enabled. debugMode activates the PrettyError renderer, which on any Lua or template error response dumps the absolute path of the file that errored, complete byte contents of that file, and exception or parser error text. This response is served with HTTP 200 OK to whoever sent the request that triggered the error. Any client able to reach the server and able to provoke a runtime error in the served script obtains the full server-side source of that script and of any sibling Lua data file consulted during the request. This vulnerability is fixed in 1.17.7."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-209", "description": "CWE-209: Generation of Error Message Containing Sensitive Information"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-489", "description": "CWE-489: Active Debug Code"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-540", "description": "CWE-540: Inclusion of Sensitive Information in Source Code"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-1188", "description": "CWE-1188: Insecure Default Initialization of Resource"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-26T16:38:50.435Z"}}}, "cveMetadata": {"cveId": "CVE-2026-45728", "state": "PUBLISHED", "dateUpdated": "2026-05-26T17:31:40.280Z", "dateReserved": "2026-05-13T05:51:48.667Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-05-26T16:38:50.435Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "algernon", "vendor": "xyproto", "versions": [{"status": "affected", "version": "< 1.17.7"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, when Algernon is invoked with a single file path instead of a directory, singleFileMode is set to true and debugMode is forcibly enabled. debugMode activates the PrettyError renderer, which on any Lua or template error response dumps the absolute path of the file that errored, complete byte contents of that file, and exception or parser error text. This response is served with HTTP 200 OK to whoever sent the request that triggered the error. Any client able to reach the server and able to provoke a runtime error in the served script obtains the full server-side source of that script and of any sibling Lua data file consulted during the request. This vulnerability is fixed in 1.17.7."}, {"lang": "es", "value": "Algernon es un peque\u00f1o servidor web aut\u00f3nomo y puro Go. Antes de la versi\u00f3n 1.17.7, cuando Algernon se invoca con una \u00fanica ruta de archivo en lugar de un directorio, singleFileMode se establece en true y debugMode se habilita forzosamente. debugMode activa el renderizador PrettyError, que ante cualquier respuesta de error de Lua o de plantilla, vuelca la ruta absoluta del archivo que caus\u00f3 el error, el contenido completo en bytes de ese archivo y el texto del error de excepci\u00f3n o del analizador. Esta respuesta se sirve con HTTP 200 OK a quienquiera que haya enviado la solicitud que desencaden\u00f3 el error. Cualquier cliente capaz de alcanzar el servidor y de provocar un error en tiempo de ejecuci\u00f3n en el script servido obtiene la fuente completa del lado del servidor de ese script y de cualquier archivo de datos Lua hermano consultado durante la solicitud. Esta vulnerabilidad se corrige en la versi\u00f3n 1.17.7."}], "id": "CVE-2026-45728", "lastModified": "2026-07-24T11:10:00.170", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-45728", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-26T17:31:16.231606Z", "version": "2.0.3"}}]}, "published": "2026-05-26T17:16:47.900", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/xyproto/algernon/security/advisories/GHSA-fwqx-8365-9983"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/xyproto/algernon/security/advisories/GHSA-fwqx-8365-9983"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-209"}, {"lang": "en", "value": "CWE-489"}, {"lang": "en", "value": "CWE-540"}, {"lang": "en", "value": "CWE-1188"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.17.7)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "algernon", "source": "cna", "vendor": "xyproto"}, "product": "algernon", "vendor": "xyproto"}], "created": "2026-05-26T19:15:13.718007+00:00", "updated": "2026-05-27T10:04:45.407971+00:00", "vendors": ["xyproto", "xyproto$PRODUCT$algernon"]}