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CVE-2026-42768

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()) i
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:01bbbbc4790e94b4ce6e8d09aa832137ff33637129c4b22b7eb15f73758bbe8a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"OpenSSL","vendor":"OpenSSL","versions":[{"lessThan":"4.0.1","status":"affected","version":"4.0.0","versionType":"semver"},{"lessThan":"3.6.3","status":"affected","version":"3.6.0","versionType":"semver"},{"lessThan":"3.5.7","status":"affected","version":"3.5.0","versionType":"semver"},{"lessThan":"3.4.6","status":"affected","version":"3.4.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6c5a626b69c463e6d35b2c6c859a05018de66523d2edaa7a155fc887227c0a43 · sha256:6f1e41a727069e06… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6c5a626b69c463e6d35b2c6c859a05018de66523d2edaa7a155fc887227c0a43 · sha256:6f1e41a727069e06… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-514","description":"CWE-514 Covert Channel","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6c5a626b69c463e6d35b2c6c859a05018de66523d2edaa7a155fc887227c0a43 · sha256:6f1e41a727069e06… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"name":"3.6.3 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/a2ca7b2d73e0ffc1eae183fe6e1741dac767cb4f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6c5a626b69c463e6d35b2c6c859a05018de66523d2edaa7a155fc887227c0a43 · sha256:6f1e41a727069e06… · /containers/cna/references/2
{"name":"3.5.7 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/bbb151a83041705d9d001ed2f9c12f5523e1b54d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6c5a626b69c463e6d35b2c6c859a05018de66523d2edaa7a155fc887227c0a43 · sha256:6f1e41a727069e06… · /containers/cna/references/3
{"name":"3.4.6 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/dd68364107a58841c0a2546812518b65d3a23abd"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6c5a626b69c463e6d35b2c6c859a05018de66523d2edaa7a155fc887227c0a43 · sha256:6f1e41a727069e06… · /containers/cna/references/4
{"name":"4.0.1 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/f04b377be3d821741c86d1f4bf84dee09f3d5c3e"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6c5a626b69c463e6d35b2c6c859a05018de66523d2edaa7a155fc887227c0a43 · sha256:6f1e41a727069e06… · /containers/cna/references/1
{"name":"OpenSSL Advisory","tags":["vendor-advisory"],"url":"https://openssl-library.org/news/secadv/20260609.txt"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6c5a626b69c463e6d35b2c6c859a05018de66523d2edaa7a155fc887227c0a43 · sha256:6f1e41a727069e06… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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