{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-75806", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "state": "PUBLISHED", "assignerShortName": "openssl", "dateReserved": "2026-08-18T09:34:32.659Z", "datePublished": "2026-09-29T15:32:21.457Z", "dateUpdated": "2026-09-29T16:53:23.785Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "4.0.3", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThan": "3.6.5", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "3.5.9", "status": "affected", "version": "3.5.0", "versionType": "semver"}, {"lessThan": "3.4.8", "status": "affected", "version": "3.4.0", "versionType": "semver"}, {"lessThan": "3.0.23", "status": "affected", "version": "3.0.0", "versionType": "semver"}, {"lessThan": "1.1.1zj", "status": "affected", "version": "1.1.1", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Mounir Idrassi"}, {"lang": "en", "type": "remediation developer", "value": "Mounir Idrassi"}], "datePublic": "2026-09-29T14:21:57.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Issue summary: An established DTLS 1.2 association using an AEAD cipher suite<br>can be terminated by a single unauthenticated datagram whose encrypted<br>fragment is shorter than the mandatory explicit IV and authentication tag<br>overhead.<br><br>Impact summary: An attacker who can send a datagram that is routed to an<br>existing DTLS 1.2 association can tear that association down without knowing<br>any key material. This is a Denial of Service limited to the targeted<br>association. There is no memory safety or confidentiality impact.<br><br>CWE: CWE-1284: Improper Validation of Specified Quantity in Input<br><br>Description: In TLS 1.2 and DTLS 1.2 every record protected by an AEAD cipher<br>suite carries an explicit IV followed by the ciphertext and an authentication<br>tag. When decrypting such a record the record layer passed the record length to<br>the cipher implementation before checking that the record was long enough to<br>contain the explicit IV and the tag. For a record shorter than that overhead the<br>cipher implementation rejected the impossible length, and the record layer<br>treated this as an internal failure and raised a fatal internal_error alert<br>instead of treating the record as one that failed authentication.<br><br>In TLS 1.2 the same record causes a fatal internal_error alert instead of the<br>expected bad_record_mac alert. Since any undecryptable record already<br>terminates a TLS connection, this is a protocol conformance issue rather than<br>a security issue in TLS.<br><br>The fix validates the record length against the explicit IV and tag length<br>before any AEAD processing, so that TLS reports bad_record_mac and DTLS<br>silently discards the record.<br><br>FIPS impact: no<br>The affected code is outside the FIPS module boundary."}], "value": "Issue summary: An established DTLS 1.2 association using an AEAD cipher suite\ncan be terminated by a single unauthenticated datagram whose encrypted\nfragment is shorter than the mandatory explicit IV and authentication tag\noverhead.\n\nImpact summary: An attacker who can send a datagram that is routed to an\nexisting DTLS 1.2 association can tear that association down without knowing\nany key material. This is a Denial of Service limited to the targeted\nassociation. There is no memory safety or confidentiality impact.\n\nCWE: CWE-1284: Improper Validation of Specified Quantity in Input\n\nDescription: In TLS 1.2 and DTLS 1.2 every record protected by an AEAD cipher\nsuite carries an explicit IV followed by the ciphertext and an authentication\ntag. When decrypting such a record the record layer passed the record length to\nthe cipher implementation before checking that the record was long enough to\ncontain the explicit IV and the tag. For a record shorter than that overhead the\ncipher implementation rejected the impossible length, and the record layer\ntreated this as an internal failure and raised a fatal internal_error alert\ninstead of treating the record as one that failed authentication.\n\nIn TLS 1.2 the same record causes a fatal internal_error alert instead of the\nexpected bad_record_mac alert. Since any undecryptable record already\nterminates a TLS connection, this is a protocol conformance issue rather than\na security issue in TLS.\n\nThe fix validates the record length against the explicit IV and tag length\nbefore any AEAD processing, so that TLS reports bad_record_mac and DTLS\nsilently discards the record.\n\nFIPS impact: no\nThe affected code is outside the FIPS module boundary."}], "metrics": [{"format": "other", "other": {"content": {"text": "Low"}, "type": "https://openssl-library.org/policies/general/security-policy/"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-1284", "description": "CWE-1284 Improper Validation of Specified Quantity in Input", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-09-29T15:32:21.457Z"}, "references": [{"name": "OpenSSL Advisory", "tags": ["vendor-advisory"], "url": "https://openssl-library.org/news/secadv/20260929.txt"}, {"name": "4.0.3 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/04728a289a823e68137f88da016cb9ede307217d"}, {"name": "3.6.5 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/050b275cd671a6eed1d6457642d41a5a77aab972"}, {"name": "3.5.9 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/3a4589d015a9049d47b66f186cf50a8711343a1d"}, {"name": "3.4.8 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/5af82fefbaf2b5fec2fc0e1d87f112844902f01d"}], "source": {"discovery": "UNKNOWN"}, "title": "Unauthenticated and Undersized DTLS 1.2 AEAD Record Causes DoS", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-09-29T16:52:47.298458Z", "id": "CVE-2026-75806", "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": "2026-09-29T16:53:23.785Z"}}]}}

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This is a Denial of Service limited to the targeted\nassociation. There is no memory safety or confidentiality impact.\n\nCWE: CWE-1284: Improper Validation of Specified Quantity in Input\n\nDescription: In TLS 1.2 and DTLS 1.2 every record protected by an AEAD cipher\nsuite carries an explicit IV followed by the ciphertext and an authentication\ntag. When decrypting such a record the record layer passed the record length to\nthe cipher implementation before checking that the record was long enough to\ncontain the explicit IV and the tag. For a record shorter than that overhead the\ncipher implementation rejected the impossible length, and the record layer\ntreated this as an internal failure and raised a fatal internal_error alert\ninstead of treating the record as one that failed authentication.\n\nIn TLS 1.2 the same record causes a fatal internal_error alert instead of the\nexpected bad_record_mac alert. Since any undecryptable record already\nterminates a TLS connection, this is a protocol conformance issue rather than\na security issue in TLS.\n\nThe fix validates the record length against the explicit IV and tag length\nbefore any AEAD processing, so that TLS reports bad_record_mac and DTLS\nsilently discards the record.\n\nFIPS impact: no\nThe affected code is outside the FIPS module boundary.", "supportingMedia": [{"type": "text/html", "value": "Issue summary: An established DTLS 1.2 association using an AEAD cipher suite<br>can be terminated by a single unauthenticated datagram whose encrypted<br>fragment is shorter than the mandatory explicit IV and authentication tag<br>overhead.<br><br>Impact summary: An attacker who can send a datagram that is routed to an<br>existing DTLS 1.2 association can tear that association down without knowing<br>any key material. This is a Denial of Service limited to the targeted<br>association. There is no memory safety or confidentiality impact.<br><br>CWE: CWE-1284: Improper Validation of Specified Quantity in Input<br><br>Description: In TLS 1.2 and DTLS 1.2 every record protected by an AEAD cipher<br>suite carries an explicit IV followed by the ciphertext and an authentication<br>tag. When decrypting such a record the record layer passed the record length to<br>the cipher implementation before checking that the record was long enough to<br>contain the explicit IV and the tag. For a record shorter than that overhead the<br>cipher implementation rejected the impossible length, and the record layer<br>treated this as an internal failure and raised a fatal internal_error alert<br>instead of treating the record as one that failed authentication.<br><br>In TLS 1.2 the same record causes a fatal internal_error alert instead of the<br>expected bad_record_mac alert. Since any undecryptable record already<br>terminates a TLS connection, this is a protocol conformance issue rather than<br>a security issue in TLS.<br><br>The fix validates the record length against the explicit IV and tag length<br>before any AEAD processing, so that TLS reports bad_record_mac and DTLS<br>silently discards the record.<br><br>FIPS impact: no<br>The affected code is outside the FIPS module boundary.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-1284", "description": "CWE-1284 Improper Validation of Specified Quantity in Input"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-09-29T15:32:21.457Z"}}}, "cveMetadata": {"cveId": "CVE-2026-75806", "state": "PUBLISHED", "dateUpdated": "2026-09-29T16:53:23.785Z", "dateReserved": "2026-08-18T09:34:32.659Z", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "datePublished": "2026-09-29T15:32:21.457Z", "assignerShortName": "openssl"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "4.0.3", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThan": "3.6.5", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "3.5.9", "status": "affected", "version": "3.5.0", "versionType": "semver"}, {"lessThan": "3.4.8", "status": "affected", "version": "3.4.0", "versionType": "semver"}, {"lessThan": "3.0.23", "status": "affected", "version": "3.0.0", "versionType": "semver"}, {"lessThan": "1.1.1zj", "status": "affected", "version": "1.1.1", "versionType": "custom"}]}], "source": "openssl-security@openssl.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Issue summary: An established DTLS 1.2 association using an AEAD cipher suite\ncan be terminated by a single unauthenticated datagram whose encrypted\nfragment is shorter than the mandatory explicit IV and authentication tag\noverhead.\n\nImpact summary: An attacker who can send a datagram that is routed to an\nexisting DTLS 1.2 association can tear that association down without knowing\nany key material. This is a Denial of Service limited to the targeted\nassociation. There is no memory safety or confidentiality impact.\n\nCWE: CWE-1284: Improper Validation of Specified Quantity in Input\n\nDescription: In TLS 1.2 and DTLS 1.2 every record protected by an AEAD cipher\nsuite carries an explicit IV followed by the ciphertext and an authentication\ntag. When decrypting such a record the record layer passed the record length to\nthe cipher implementation before checking that the record was long enough to\ncontain the explicit IV and the tag. For a record shorter than that overhead the\ncipher implementation rejected the impossible length, and the record layer\ntreated this as an internal failure and raised a fatal internal_error alert\ninstead of treating the record as one that failed authentication.\n\nIn TLS 1.2 the same record causes a fatal internal_error alert instead of the\nexpected bad_record_mac alert. Since any undecryptable record already\nterminates a TLS connection, this is a protocol conformance issue rather than\na security issue in TLS.\n\nThe fix validates the record length against the explicit IV and tag length\nbefore any AEAD processing, so that TLS reports bad_record_mac and DTLS\nsilently discards the record.\n\nFIPS impact: no\nThe affected code is outside the FIPS module boundary."}], "id": "CVE-2026-75806", "lastModified": "2026-09-29T17:17:09.793", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-75806", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-29T16:52:47.298458Z", "version": "2.0.3"}}]}, "published": "2026-09-29T16:17:11.217", "references": [{"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/04728a289a823e68137f88da016cb9ede307217d"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/050b275cd671a6eed1d6457642d41a5a77aab972"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/3a4589d015a9049d47b66f186cf50a8711343a1d"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/5af82fefbaf2b5fec2fc0e1d87f112844902f01d"}, {"source": "openssl-security@openssl.org", "url": "https://openssl-library.org/news/secadv/20260929.txt"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1284"}], "source": "openssl-security@openssl.org", "type": "Secondary"}]}

{}

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