openssl_encrypt before 1.4.0 Weak Shared Secret via PQC Simulation Mode
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.
CVE-2026-74900
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74900
openssl_encrypt
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "jahlives",
"product": "openssl_encrypt",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "1.4.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "1.4.0",
"versionType": "semver"
}
],
"packageURL": "pkg:pypi/openssl_encrypt",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-74900
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #5515 · Revision 1
- Added to Heist Feed
- Publisher date