LowFix available
edk2, edk2-hwe and 2 more products — security advisory
Issue summary: The CMS_decrypt and PKCS7_decrypt functions are vulnerable to Bleichenbacher-style attack when an attacker is able to provide the CMS or S/MIME messages and observe the error code and/or decryption output. Impact summary: The Bleichenbacher-style attack allows an attacker to use the victim's vulnerable application as a way to decrypt or sign messages with the victim's private RSA key. The attack is possible in 2 variants. 1. The decryption API (CMS_decrypt(), PKCS7_decrypt()) is used without providing the recipient certificate. In this case OpenSSL iterates over every KeyTransRecipientInfo (KTRI) without stopping at the first success. An attacker who authors a message with two KTRI entries — the first one wrapping a real CEK under the victim's public key, the second with an arbitrary probe ciphertext — obtains opportunity to iterate the 2nd KTRI to get a valid PKCS#1 v1.5 padding if the error code of the application is available. That is a Bleichenbacher oracle (Bleichenbacher, CRYPTO '98): an adaptive-chosen-ciphertext side channel from which the attacker decrypts any RSA ciphertext to the victim's key or forges any PKCS#1 v1.5 signature under it. 2. When the decryption API (CMS_decrypt(), PKCS7_decrypt()) is provided with the recipient certificate, and the recipient is not found, a random key is substituted. An attacker who authors a message and is able to compare both error code and the result of the decryption, can mount a Bleichenbacher oracle. We are not
- Products
- edk2, edk2-hwe, nodejs, openssl
- Affected versions
- 12.22.5~dfsg-5ubuntu1, 12.22.7~dfsg-2ubuntu1, 12.22.7~dfsg-2ubuntu3, 12.22.9~dfsg-1ubuntu2, 12.22.9~dfsg-1ubuntu3, 12.22.9~dfsg-1ubuntu3.1, 12.22.9~dfsg-1ubuntu3.2, 12.22.9~dfsg-1ubuntu3.3, 12.22.9~dfsg-1ubuntu3.4, 12.22.9~dfsg-1ubuntu3.5, 12.22.9~dfsg-1ubuntu3.6, 12.22.9~dfsg-1ubuntu3.6+esm2, 2025.02-3ubuntu2, 2025.02-8, 2025.02-8ubuntu1, 2025.02-8ubuntu2, 2025.02-8ubuntu3, 2025.02-8ubuntu3.1, 2025.02-8ubuntu3.2, 2025.11-3ubuntu6, 2025.11-3ubuntu7, 2025.11-3ubuntu7.2, 2025.11-3ubuntu7.3, 2025.11-3ubuntu8, 2025.11-3ubuntu8.2, 2025.11-3ubuntu9, 2026.05-2ubuntu1, 2026.05-2ubuntu2, 2026.05-2ubuntu3, 3.4.1-1ubuntu3, 3.5.0-2ubuntu1, 3.5.2-1ubuntu1, 3.5.3-1ubuntu2, 3.5.3-1ubuntu3, 3.5.3-1ubuntu3.3, 3.5.5-1ubuntu1, 3.5.5-1ubuntu3
- Fixed versions
- 3.5.3-1ubuntu3.4, 3.5.5-1ubuntu3.2
- CVEs
- CVE-2026-42768
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:12 UTC · Revision 1
Source evidence
Issue summary: The CMS_decrypt and PKCS7_decrypt functions are vulnerable to Bleichenbacher-style attack when an attacker is able to provide the CMS or S/MIME messages and observe the error code and/or decryption output. Impact summary: The Bleichenbacher-style attack allows an attacker to use the victim's vulnerable application as a way to decrypt or sign messages with the victim's private RSA key. The attack is possible in 2 variants. 1. The decryption API (CMS_decrypt(), PKCS7_decrypt()) is used without providing the recipient certificate. In this case OpenSSL iterates over every KeyTransRecipientInfo (KTRI) without stopping at the first success. An attacker who authors a message with two KTRI entries — the first one wrapping a real CEK under the victim's public key, the second with an arbitrary probe ciphertext — obtains opportunity to iterate the 2nd KTRI to get a valid PKCS#1 v1.5 padding if the error code of the application is available. That is a Bleichenbacher oracle (Bleichenbacher, CRYPTO '98): an adaptive-chosen-ciphertext side channel from which the attacker decrypts any RSA ciphertext to the victim's key or forges any PKCS#1 v1.5 signature under it. 2. When the decryption API (CMS_decrypt(), PKCS7_decrypt()) is provided with the recipient certificate, and the recipient is not found, a random key is substituted. An attacker who authors a message and is able to compare both error code and the result of the decryption, can mount a Bleichenbacher oracle. We are not
osv:UBUNTU-CVE-2026-42768
nodejs
Fixed versions: Not specified
edk2
Fixed versions: Not specified
openssl
Fixed versions: 3.5.3-1ubuntu3.4
edk2
Fixed versions: Not specified
edk2-hwe
Fixed versions: Not specified
edk2
Fixed versions: Not specified
edk2-hwe
Fixed versions: Not specified
openssl
Fixed versions: 3.5.5-1ubuntu3.2
Complete source record
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"summary": "Issue summary: The CMS_decrypt and PKCS7_decrypt functions are vulnerable to Bleichenbacher-style attack when an attacker is able to provide the CMS or S/MIME messages and observe the error code and/or decryption output. Impact summary: The Bleichenbacher-style attack allows an attacker to use the victim's vulnerable application as a way to decrypt or sign messages with the victim's private RSA key. The attack is possible in 2 variants. 1. The decryption API (CMS_decrypt(), PKCS7_decrypt()) is used without providing the recipient certificate. In this case OpenSSL iterates over every KeyTransRecipientInfo (KTRI) without stopping at the first success. An attacker who authors a message with two KTRI entries — the first one wrapping a real CEK under the victim's public key, the second with an arbitrary probe ciphertext — obtains opportunity to iterate the 2nd KTRI to get a valid PKCS#1 v1.5 padding if the error code of the application is available. That is a Bleichenbacher oracle (Bleichenbacher, CRYPTO '98): an adaptive-chosen-ciphertext side channel from which the attacker decrypts any RSA ciphertext to the victim's key or forges any PKCS#1 v1.5 signature under it. 2. When the decryption API (CMS_decrypt(), PKCS7_decrypt()) is provided with the recipient certificate, and the recipient is not found, a random key is substituted. An attacker who authors a message and is able to compare both error code and the result of the decryption, can mount a Bleichenbacher oracle. We are not ",
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"modified": "2026-10-17T12:58:16.261448262Z",
"provider": "osv",
"upstream": [
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],
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"https://ubuntu.com/security/CVE-2026-42768",
"https://www.cve.org/CVERecord?id=CVE-2026-42768",
"https://openssl-library.org/news/secadv/20260609.txt",
"https://ubuntu.com/security/notices/USN-8414-1"
]
},
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{
"value": "CVE-2026-42768",
"evidence": "/upstream"
}
],
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},
"source_id": "core-osv",
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"published_at": "2026-06-09T00:00:00+00:00"
}