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CVE

CVE-2026-74900

openssl_encrypt before 1.4.0 Weak Shared Secret via PQC Simulation Mode
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CVE

CVE-2026-74900

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74900.json, https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-p3gq-pcg9-qvfv, https://nvd.nist.gov/vuln/detail/CVE-2026-74900, https://www.vulncheck.com/advisories/openssl-encrypt-before-weak-shared-secret-via-pqc-simulation-mode

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00337%
EPSS Percentile
0.26215%
Introduced Version
0
Fix Available
768df5cd1910e349509f07a27eeac6951e0003bf

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