CVE-2026-81703 HIGH

CVE-2026-81703: openssl_encrypt before 1.4.9 Authentication Bypass via Unencrypted PQC Key

Vendor Jahlives
Product openssl_encrypt
Weakness CWE-287 · Improper authentication
Published August 27, 2026
Last update August 27, 2026

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

openssl_encrypt versions before 1.4.9 fail to validate encryption status of embedded post-quantum private keys in file metadata. Attackers can craft files with unencrypted embedded PQC keys that decrypt under any password, bypassing authentication and producing attacker-chosen plaintext with false integrity verification.

Key dates

02Disclosure timeline

August 27, 2026 CVE published
August 27, 2026 Record updated

Related vulnerabilities

04Related CVE