CRITICALVulnerability
CVE-2026-74900
openssl_encrypt versions before 1.4.0 contain a critical vulnerability in pqc.py where KEM decapsulation failures silently fall back to simulation mode, generating a deterministic shared secret from only 16 bytes of the private key and publicly available encapsulated key data. Attackers who obtain 16 bytes of the private key can compute the shared secret and decrypt all ciphertext, as the fallback triggers on any KEM failure without raising an error.
Properties
- severity
- CRITICAL
- score
- 9.8
- epss_score
- 0.00337
- cve_id
- CVE-2026-74900
- vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- published_at
- 2026-08-17T11:16:45.050
- last_modified
- 2026-09-01T15:24:43.217
- epss_percentile
- 0.26416
Related Entities (4)
ENRICHED_BY (1)
→[Source]FIRST EPSS
AFFECTS_PRODUCT (1)
→[Product]
HAS_WEAKNESS (1)
→[Weakness]Unchecked Error Condition
DESCRIBED_BY (1)
→[Source]NVD
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