CVE-2026-75803

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It also verifies the AEAD tag after the<br>decryption operation. However for AES-OCB and ChaCha20-Poly1305 ciphers<br>it skipped the AEAD tag verification when an empty ciphertext was passed to<br>the function. The callers of this function might believe that a successful<br>return indicates a valid AEAD tag for these ciphers, even when that has not<br>truly been validated in this case.<br><br>FIPS impact: no<br>The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this CVE<br>as the affected algorithms are not FIPS approved and thus not implemented<br>in the FIPS module."}], "value": "Issue summary: ChaCha20-Poly1305 and AES-OCB decryption with an empty\nciphertext can report success without verifying the supplied authentication\ntag when the operation is finalized by calling the EVP_Cipher() function.\n\nImpact summary: Applications calling EVP_Cipher() on an empty ciphertext and\nexpecting the call to check the AEAD tag may accept forged messages.\n\nCWE: CWE-354 (Improper Validation of Integrity Check Value)\n\nDescription: The EVP_Cipher() API call for AEAD ciphers behaves like a one\nshot encryption and decryption call. It also verifies the AEAD tag after the\ndecryption operation. However for AES-OCB and ChaCha20-Poly1305 ciphers\nit skipped the AEAD tag verification when an empty ciphertext was passed to\nthe function. The callers of this function might believe that a successful\nreturn indicates a valid AEAD tag for these ciphers, even when that has not\ntruly been validated in this case.\n\nFIPS impact: no\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this CVE\nas the affected algorithms are not FIPS approved and thus not implemented\nin the FIPS module."}], "metrics": [{"format": "other", "other": {"content": {"text": "Low"}, "type": "https://openssl-library.org/policies/general/security-policy/"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-354", "description": "Improper Validation of Integrity Check Value", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-08-25T13:00:25.067Z"}, "references": [{"name": "OpenSSL Advisory", "tags": ["vendor-advisory"], "url": "https://openssl-library.org/news/secadv/20260825.txt"}, {"name": "4.0.2 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/6c7aa6f8f6449b7fe0137ee8be65fcd239bd7d6a"}, {"name": "3.6.4 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/3621257986e27e540bf96a11570929a6e5a9e05b"}, {"name": "3.5.8 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/bdeb0cd994d915342787f117ee75044f0dc36f34"}, {"name": "3.4.7 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/bf95f5f772e9362f87b25cfa2f8cb15d984865b9"}, {"name": "3.0.22 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/119ab9555dc62275bbd71f6f49529b1a44feba42"}], "source": {"discovery": "UNKNOWN"}, "title": "AEAD Forgeries with Empty Ciphertext When Using EVP_Cipher()", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-09-01T18:22:51.167833Z", "id": "CVE-2026-75803", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"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": "2026-09-01T18:23:06.793Z"}}]}}

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It also verifies the AEAD tag after the\ndecryption operation. However for AES-OCB and ChaCha20-Poly1305 ciphers\nit skipped the AEAD tag verification when an empty ciphertext was passed to\nthe function. The callers of this function might believe that a successful\nreturn indicates a valid AEAD tag for these ciphers, even when that has not\ntruly been validated in this case.\n\nFIPS impact: no\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this CVE\nas the affected algorithms are not FIPS approved and thus not implemented\nin the FIPS module.", "supportingMedia": [{"type": "text/html", "value": "Issue summary: ChaCha20-Poly1305 and AES-OCB decryption with an empty<br>ciphertext can report success without verifying the supplied authentication<br>tag when the operation is finalized by calling the EVP_Cipher() function.<br><br>Impact summary: Applications calling EVP_Cipher() on an empty ciphertext and<br>expecting the call to check the AEAD tag may accept forged messages.<br><br>CWE: CWE-354 (Improper Validation of Integrity Check Value)<br><br>Description: The EVP_Cipher() API call for AEAD ciphers behaves like a one<br>shot encryption and decryption call. It also verifies the AEAD tag after the<br>decryption operation. However for AES-OCB and ChaCha20-Poly1305 ciphers<br>it skipped the AEAD tag verification when an empty ciphertext was passed to<br>the function. The callers of this function might believe that a successful<br>return indicates a valid AEAD tag for these ciphers, even when that has not<br>truly been validated in this case.<br><br>FIPS impact: no<br>The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this CVE<br>as the affected algorithms are not FIPS approved and thus not implemented<br>in the FIPS module.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-354", "description": "Improper Validation of Integrity Check Value"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-08-25T13:00:25.067Z"}}}, "cveMetadata": {"cveId": "CVE-2026-75803", "state": "PUBLISHED", "dateUpdated": "2026-09-01T18:23:06.793Z", "dateReserved": "2026-08-18T09:34:32.659Z", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "datePublished": "2026-08-25T13:00:25.067Z", "assignerShortName": "openssl"}, "dataVersion": "5.2"}

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{}

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