CVE-2026-11941

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-11941", "assignerOrgId": "a22f1246-ba21-4bb4-a601-ad51614c1513", "state": "PUBLISHED", "assignerShortName": "cloudflare", "dateReserved": "2026-06-10T20:16:34.590Z", "datePublished": "2026-06-19T09:55:54.501Z", "dateUpdated": "2026-06-22T15:10:00.033Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "a22f1246-ba21-4bb4-a601-ad51614c1513", "shortName": "cloudflare", "dateUpdated": "2026-06-19T09:55:54.501Z"}, "title": "Use-after-free in connection ID iterator and FFI functions", "datePublic": "2026-06-19T09:49:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-416", "description": "CWE-416 Use after free", "type": "CWE"}]}], "affected": [{"vendor": "Cloudflare", "product": "Quiche", "repo": "https://github.com/cloudflare/quiche", "versions": [{"status": "affected", "version": "0.20.0", "lessThanOrEqual": "0.29.1", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Cloudflare Quiche was affected by 2 use-after-free vulnerabilities in the connection ID iterator FFI functions.\n\n\n\nThe \u201cquiche_connection_id_iter_next\u201d and \u201cquiche_conn_retired_scid_next\u201d functions would return a pointer to a \u201cConnectionId\u201d to the applications via function arguments, but the owned \u201cConnectionId\u201d would be dropped at the end of those functions' scope.\n\n\n\nOnly applications using those FFI functions are affected. The FFI API is disabled by default by a build-time feature flag.\n\n\n\nImpact\nIf unpatched, an application calling the affected FFI functions will dereference freed memory. The most likely outcome is undefined behavior leading to a process crash (denial of service). Depending on allocator state, the read may also return adjacent heap contents, resulting in limited information disclosure or incorrect connection identifier handling.\n\n\n\nMitigation\nUsers are requested to upgrade to quiche 0.29.2 which is the earliest version containing the fix for this issue.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Cloudflare Quiche was affected by 2 use-after-free vulnerabilities in the connection ID iterator FFI functions.</p><p>The \u201cquiche_connection_id_iter_next\u201d and \u201cquiche_conn_retired_scid_next\u201d functions would return a pointer to a \u201cConnectionId\u201d to the applications via function arguments, but the owned \u201cConnectionId\u201d would be dropped at the end of those functions' scope.</p><p>Only applications using those FFI functions are affected. The FFI API is disabled by default by a build-time feature flag.</p><p><span><b>Impact<br></b></span><span>If unpatched, an application calling the affected FFI functions will dereference freed memory. The most likely outcome is undefined behavior leading to a process crash (denial of service). Depending on allocator state, the read may also return adjacent heap contents, resulting in limited information disclosure or incorrect connection identifier handling.</span></p><p><span><b>Mitigation<br></b></span><span>Users are requested to upgrade to quiche 0.29.2 which is the earliest version containing the fix for this issue.</span></p><p><b></b><br></p><br>"}]}], "references": [{"url": "https://github.com/cloudflare/quiche/security/advisories/GHSA-mh64-ph39-mrc9"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW", "baseSeverity": "MEDIUM", "baseScore": 5.6, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"}}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-22T15:09:49.880714Z", "id": "CVE-2026-11941", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"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": "2026-06-22T15:10:00.033Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"cna": {"title": "Use-after-free in connection ID iterator and FFI functions", "source": {"discovery": "UNKNOWN"}, "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.6, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"repo": "https://github.com/cloudflare/quiche", "vendor": "Cloudflare", "product": "Quiche", "versions": [{"status": "affected", "version": "0.20.0", "versionType": "semver", "lessThanOrEqual": "0.29.1"}], "defaultStatus": "unaffected"}], "datePublic": "2026-06-19T09:49:00.000Z", "references": [{"url": "https://github.com/cloudflare/quiche/security/advisories/GHSA-mh64-ph39-mrc9"}], "x_generator": {"engine": "Vulnogram 1.0.2"}, "descriptions": [{"lang": "en", "value": "Cloudflare Quiche was affected by 2 use-after-free vulnerabilities in the connection ID iterator FFI functions.\n\n\n\nThe \u201cquiche_connection_id_iter_next\u201d and \u201cquiche_conn_retired_scid_next\u201d functions would return a pointer to a \u201cConnectionId\u201d to the applications via function arguments, but the owned \u201cConnectionId\u201d would be dropped at the end of those functions' scope.\n\n\n\nOnly applications using those FFI functions are affected. The FFI API is disabled by default by a build-time feature flag.\n\n\n\nImpact\nIf unpatched, an application calling the affected FFI functions will dereference freed memory. The most likely outcome is undefined behavior leading to a process crash (denial of service). Depending on allocator state, the read may also return adjacent heap contents, resulting in limited information disclosure or incorrect connection identifier handling.\n\n\n\nMitigation\nUsers are requested to upgrade to quiche 0.29.2 which is the earliest version containing the fix for this issue.", "supportingMedia": [{"type": "text/html", "value": "<p>Cloudflare Quiche was affected by 2 use-after-free vulnerabilities in the connection ID iterator FFI functions.</p><p>The \u201cquiche_connection_id_iter_next\u201d and \u201cquiche_conn_retired_scid_next\u201d functions would return a pointer to a \u201cConnectionId\u201d to the applications via function arguments, but the owned \u201cConnectionId\u201d would be dropped at the end of those functions' scope.</p><p>Only applications using those FFI functions are affected. The FFI API is disabled by default by a build-time feature flag.</p><p><span><b>Impact<br></b></span><span>If unpatched, an application calling the affected FFI functions will dereference freed memory. The most likely outcome is undefined behavior leading to a process crash (denial of service). Depending on allocator state, the read may also return adjacent heap contents, resulting in limited information disclosure or incorrect connection identifier handling.</span></p><p><span><b>Mitigation<br></b></span><span>Users are requested to upgrade to quiche 0.29.2 which is the earliest version containing the fix for this issue.</span></p><p><b></b><br></p><br>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use after free"}]}], "providerMetadata": {"orgId": "a22f1246-ba21-4bb4-a601-ad51614c1513", "shortName": "cloudflare", "dateUpdated": "2026-06-19T09:55:54.501Z"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-11941", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-22T15:09:49.880714Z"}}}], "providerMetadata": {"shortName": "CISA-ADP", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "dateUpdated": "2026-06-22T15:09:56.065Z"}}]}, "cveMetadata": {"cveId": "CVE-2026-11941", "state": "PUBLISHED", "dateUpdated": "2026-06-19T09:55:54.501Z", "dateReserved": "2026-06-10T20:16:34.590Z", "assignerOrgId": "a22f1246-ba21-4bb4-a601-ad51614c1513", "datePublished": "2026-06-19T09:55:54.501Z", "assignerShortName": "cloudflare"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Quiche", "repo": "https://github.com/cloudflare/quiche", "vendor": "Cloudflare", "versions": [{"lessThanOrEqual": "0.29.1", "status": "affected", "version": "0.20.0", "versionType": "semver"}]}], "source": "cna@cloudflare.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Cloudflare Quiche was affected by 2 use-after-free vulnerabilities in the connection ID iterator FFI functions.\n\n\n\nThe \u201cquiche_connection_id_iter_next\u201d and \u201cquiche_conn_retired_scid_next\u201d functions would return a pointer to a \u201cConnectionId\u201d to the applications via function arguments, but the owned \u201cConnectionId\u201d would be dropped at the end of those functions' scope.\n\n\n\nOnly applications using those FFI functions are affected. The FFI API is disabled by default by a build-time feature flag.\n\n\n\nImpact\nIf unpatched, an application calling the affected FFI functions will dereference freed memory. The most likely outcome is undefined behavior leading to a process crash (denial of service). Depending on allocator state, the read may also return adjacent heap contents, resulting in limited information disclosure or incorrect connection identifier handling.\n\n\n\nMitigation\nUsers are requested to upgrade to quiche 0.29.2 which is the earliest version containing the fix for this issue."}, {"lang": "es", "value": "Cloudflare Quiche se vio afectado por 2 vulnerabilidades de uso despu\u00e9s de liberaci\u00f3n en las funciones FFI del iterador de ID de conexi\u00f3n.\n\nLas funciones \u2019quiche_connection_id_iter_next\u2019 y \u2019quiche_conn_retired_scid_next\u2019 devolver\u00edan un puntero a un \u2019ConnectionId\u2019 a las aplicaciones a trav\u00e9s de argumentos de funci\u00f3n, pero el \u2019ConnectionId\u2019 pose\u00eddo se descartar\u00eda al final del \u00e1mbito de esas funciones.\n\nSolo las aplicaciones que utilizan esas funciones FFI se ven afectadas. La API FFI est\u00e1 deshabilitada por defecto por un feature flag en tiempo de compilaci\u00f3n.\n\nImpacto\nSi no se aplica el parche, una aplicaci\u00f3n que llama a las funciones FFI afectadas desreferenciar\u00e1 memoria liberada. El resultado m\u00e1s probable es un comportamiento indefinido que lleva a un fallo del proceso (denegaci\u00f3n de servicio). Dependiendo del estado del asignador, la lectura tambi\u00e9n puede devolver contenido adyacente del heap, lo que resulta en una revelaci\u00f3n de informaci\u00f3n limitada o un manejo incorrecto del identificador de conexi\u00f3n.\n\nMitigaci\u00f3n\nSe solicita a los usuarios que actualicen a quiche 0.29.2, que es la versi\u00f3n m\u00e1s temprana que contiene la correcci\u00f3n para este problema."}], "id": "CVE-2026-11941", "lastModified": "2026-10-25T23:10:00.167", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.4, "source": "cna@cloudflare.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-11941", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-22T15:09:49.880714Z", "version": "2.0.3"}}]}, "published": "2026-06-19T12:16:26.137", "references": [{"source": "cna@cloudflare.com", "url": "https://github.com/cloudflare/quiche/security/advisories/GHSA-mh64-ph39-mrc9"}], "sourceIdentifier": "cna@cloudflare.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "cna@cloudflare.com", "type": "Secondary"}]}

{}

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