SEPTEMBER 17, 2026
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Case File

CVE-2026-74900

CRITICAL · CVSS 9.8 EPSS 0.34% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-17 · Last synced 2026-09-16

CyberRota Analysis

AI-Generated

OpenSSL versions prior to 1.4.0 are vulnerable due to a critical flaw in the pqc.py module, where KEM decapsulation failures revert to a simulation mode that allows attackers to derive a shared secret using just 16 bytes of the private key and public encapsulated key data. This vulnerability enables unauthorized decryption of all ciphertexts, posing a significant risk to data confidentiality. Organizations utilizing affected OpenSSL versions should prioritize immediate updates to mitigate this critical security threat.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-74900
Severity
CRITICAL
CVSS
9.8
EPSS
0.34%
OpenSSL

Original NVD Description

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.

Related CVEs

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