CVE-2026-12523

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-12523", "assignerOrgId": "a22f1246-ba21-4bb4-a601-ad51614c1513", "state": "PUBLISHED", "assignerShortName": "cloudflare", "dateReserved": "2026-06-17T13:35:37.498Z", "datePublished": "2026-07-14T15:51:28.886Z", "dateUpdated": "2026-07-15T17:47:52.441Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "a22f1246-ba21-4bb4-a601-ad51614c1513", "shortName": "cloudflare", "dateUpdated": "2026-07-14T15:51:28.886Z"}, "title": "Resource exhaustion in quiche HTTP/3 and QPACK layers", "affected": [{"vendor": "Cloudflare", "product": "quiche", "versions": [{"status": "affected", "version": "0.1.0", "lessThan": "0.29.3", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Summary\n\n\n\nCloudflare quiche's HTTP/3 layer was discovered to be vulnerable to resource exhaustion (i.e., memory) by means of specially crafted HTTP/3 frames.\n\n\n\n\nImpact\n\n\n\nHTTP/3 defines multiple frame types to support HTTP message exchanges and connection management. Each frame has a length and a payload whose length depends on the frame type. quiche was found to be vulnerable when parsing some frame types to pre-allocating memory based on the declared length. An attacker would not need to send the number of declared bytes to trigger this issue.\n\n\n\nIn addition, quiche was found to not apply QPACK decompression limits correctly. This could allow an attacker to send specially crafted HEADERS frames that would cause more memory commitment than otherwise advertised by MAX_FIELD_SECTION_SIZE (configured by set_max_field_section_size()).\n\n\n\n\n\n\nMitigation:\n\n * \n\nUsers are requested to upgrade to quiche 0.29.3 which is the earliest version containing the fix for this issue.\n\n\n\n\n\n\n\n\n\nCredits: Disclosed responsibly by S\u00e9bastien F\u00e9ry", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Summary</p><p>Cloudflare quiche's HTTP/3 layer was discovered to be vulnerable to resource exhaustion (i.e., memory) by means of specially crafted HTTP/3 frames.</p><br><div><p>Impact</p><p>HTTP/3 defines multiple frame types to support HTTP message exchanges and connection management. Each frame has a length and a payload whose length depends on the frame type. quiche was found to be vulnerable when parsing some frame types to pre-allocating memory based on the declared length. An attacker would not need to send the number of declared bytes to trigger this issue.</p><p>In addition, quiche was found to not apply QPACK decompression limits correctly. This could allow an attacker to send specially crafted HEADERS frames that would cause more memory commitment than otherwise advertised by MAX_FIELD_SECTION_SIZE (configured by set_max_field_section_size()).</p><br></div><div><p>Mitigation:</p><ul><li><p>Users are requested to upgrade to quiche 0.29.3 which is the earliest version containing the fix for this issue.</p></li></ul><div><br></div></div><div><b>Credits: </b>Disclosed responsibly by S\u00e9bastien F\u00e9ry&nbsp;</div>"}]}], "references": [{"url": "https://github.com/cloudflare/quiche/security/advisories/GHSA-4fgf-9xrr-88gf"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseSeverity": "HIGH", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}}], "credits": [{"lang": "en", "value": "S\u00e9bastien F\u00e9ry", "type": "reporter"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-400", "lang": "en", "description": "CWE-400 Uncontrolled Resource Consumption"}]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-15T14:08:33.441723Z", "id": "CVE-2026-12523", "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": "2026-07-15T17:47:52.441Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-12523", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-15T14:08:33.441723Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-400", "description": "CWE-400 Uncontrolled Resource Consumption"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-15T14:08:37.928Z"}}], "cna": {"title": "Resource exhaustion in quiche HTTP/3 and QPACK layers", "source": {"discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "reporter", "value": "S\u00e9bastien F\u00e9ry"}], "metrics": [{"format": "CVSS", "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"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Cloudflare", "product": "quiche", "versions": [{"status": "affected", "version": "0.1.0", "lessThan": "0.29.3", "versionType": "semver"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://github.com/cloudflare/quiche/security/advisories/GHSA-4fgf-9xrr-88gf"}], "x_generator": {"engine": "Vulnogram 1.0.2"}, "descriptions": [{"lang": "en", "value": "Summary\n\n\n\nCloudflare quiche's HTTP/3 layer was discovered to be vulnerable to resource exhaustion (i.e., memory) by means of specially crafted HTTP/3 frames.\n\n\n\n\nImpact\n\n\n\nHTTP/3 defines multiple frame types to support HTTP message exchanges and connection management. Each frame has a length and a payload whose length depends on the frame type. quiche was found to be vulnerable when parsing some frame types to pre-allocating memory based on the declared length. An attacker would not need to send the number of declared bytes to trigger this issue.\n\n\n\nIn addition, quiche was found to not apply QPACK decompression limits correctly. This could allow an attacker to send specially crafted HEADERS frames that would cause more memory commitment than otherwise advertised by MAX_FIELD_SECTION_SIZE (configured by set_max_field_section_size()).\n\n\n\n\n\n\nMitigation:\n\n * \n\nUsers are requested to upgrade to quiche 0.29.3 which is the earliest version containing the fix for this issue.\n\n\n\n\n\n\n\n\n\nCredits: Disclosed responsibly by S\u00e9bastien F\u00e9ry", "supportingMedia": [{"type": "text/html", "value": "<p>Summary</p><p>Cloudflare quiche's HTTP/3 layer was discovered to be vulnerable to resource exhaustion (i.e., memory) by means of specially crafted HTTP/3 frames.</p><br><div><p>Impact</p><p>HTTP/3 defines multiple frame types to support HTTP message exchanges and connection management. Each frame has a length and a payload whose length depends on the frame type. quiche was found to be vulnerable when parsing some frame types to pre-allocating memory based on the declared length. An attacker would not need to send the number of declared bytes to trigger this issue.</p><p>In addition, quiche was found to not apply QPACK decompression limits correctly. This could allow an attacker to send specially crafted HEADERS frames that would cause more memory commitment than otherwise advertised by MAX_FIELD_SECTION_SIZE (configured by set_max_field_section_size()).</p><br></div><div><p>Mitigation:</p><ul><li><p>Users are requested to upgrade to quiche 0.29.3 which is the earliest version containing the fix for this issue.</p></li></ul><div><br></div></div><div><b>Credits: </b>Disclosed responsibly by S\u00e9bastien F\u00e9ry&nbsp;</div>", "base64": false}]}], "providerMetadata": {"orgId": "a22f1246-ba21-4bb4-a601-ad51614c1513", "shortName": "cloudflare", "dateUpdated": "2026-07-14T15:51:28.886Z"}}}, "cveMetadata": {"cveId": "CVE-2026-12523", "state": "PUBLISHED", "dateUpdated": "2026-07-15T17:47:52.441Z", "dateReserved": "2026-06-17T13:35:37.498Z", "assignerOrgId": "a22f1246-ba21-4bb4-a601-ad51614c1513", "datePublished": "2026-07-14T15:51:28.886Z", "assignerShortName": "cloudflare"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "quiche", "vendor": "Cloudflare", "versions": [{"lessThan": "0.29.3", "status": "affected", "version": "0.1.0", "versionType": "semver"}]}], "source": "cna@cloudflare.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:cloudflare:quiche:*:*:*:*:*:rust:*:*", "matchCriteriaId": "61C1D9E8-B9EC-4441-A5A4-AD4413951600", "versionEndExcluding": "0.29.3", "versionStartIncluding": "0.1.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Summary\n\n\n\nCloudflare quiche's HTTP/3 layer was discovered to be vulnerable to resource exhaustion (i.e., memory) by means of specially crafted HTTP/3 frames.\n\n\n\n\nImpact\n\n\n\nHTTP/3 defines multiple frame types to support HTTP message exchanges and connection management. Each frame has a length and a payload whose length depends on the frame type. quiche was found to be vulnerable when parsing some frame types to pre-allocating memory based on the declared length. An attacker would not need to send the number of declared bytes to trigger this issue.\n\n\n\nIn addition, quiche was found to not apply QPACK decompression limits correctly. This could allow an attacker to send specially crafted HEADERS frames that would cause more memory commitment than otherwise advertised by MAX_FIELD_SECTION_SIZE (configured by set_max_field_section_size()).\n\n\n\n\n\n\nMitigation:\n\n * \n\nUsers are requested to upgrade to quiche 0.29.3 which is the earliest version containing the fix for this issue.\n\n\n\n\n\n\n\n\n\nCredits: Disclosed responsibly by S\u00e9bastien F\u00e9ry"}, {"lang": "es", "value": "Resumen\n\nSe descubri\u00f3 que la capa HTTP/3 de Cloudflare quiche era vulnerable al agotamiento de recursos (es decir, memoria) por medio de tramas HTTP/3 especialmente dise\u00f1adas.\n\nImpacto\n\nHTTP/3 define m\u00faltiples tipos de tramas para soportar los intercambios de mensajes HTTP y la gesti\u00f3n de conexiones. Cada trama tiene una longitud y una carga \u00fatil cuya longitud depende del tipo de trama. Se descubri\u00f3 que quiche era vulnerable al analizar algunos tipos de tramas a la preasignaci\u00f3n de memoria bas\u00e1ndose en la longitud declarada. Un atacante no necesitar\u00eda enviar el n\u00famero de bytes declarados para activar este problema.\n\nAdem\u00e1s, se descubri\u00f3 que quiche no aplicaba los l\u00edmites de descompresi\u00f3n QPACK correctamente. Esto podr\u00eda permitir a un atacante enviar tramas HEADERS especialmente dise\u00f1adas que causar\u00edan un mayor compromiso de memoria de lo que se anunciar\u00eda de otro modo por MAX_FIELD_SECTION_SIZE (configurado por set_max_field_section_size()).\n\nMitigaci\u00f3n:\n\n * Se solicita a los usuarios que actualicen a quiche 0.29.3, que es la versi\u00f3n m\u00e1s temprana que contiene la correcci\u00f3n para este problema.\n\nCr\u00e9ditos: Divulgado responsablemente por S\u00e9bastien F\u00e9ry"}], "id": "CVE-2026-12523", "lastModified": "2026-10-24T21:10:00.130", "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": "cna@cloudflare.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-12523", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-15T14:08:33.441723Z", "version": "2.0.3"}}]}, "published": "2026-07-14T16:16:45.050", "references": [{"source": "cna@cloudflare.com", "tags": ["Vendor Advisory"], "url": "https://github.com/cloudflare/quiche/security/advisories/GHSA-4fgf-9xrr-88gf"}], "sourceIdentifier": "cna@cloudflare.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

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