CVE-2026-74900

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Source

https://cve.org/CVERecord?id=CVE-2026-74900

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74900.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-74900

Aliases

GHSA-p3gq-pcg9-qvfv
PYSEC-2026-3772

Published

2026-08-17T11:04:59Z

Modified

2026-09-03T03:48:16Z

Severity

9.3 (Critical) CVSS_V4 - 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 CVSS Calculator

Summary

openssl_encrypt before 1.4.0 Weak Shared Secret via PQC Simulation Mode

Details

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.

Database specific

{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-391"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74900.json"
}

References

Affected packages

Git / github.com/jahlives/openssl_encrypt

Affected ranges

Type

GIT

Repo

https://github.com/jahlives/openssl_encrypt

Events

Introduced

Fixed

768df5cd1910e349509f07a27eeac6951e0003bf

Database specific

Show details

{
    "cpe": "cpe:2.3:a:jahlives:openssl_encrypt:*:*:*:*:*:python:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.4.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ]
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74900.json"