CVE-2026-81688 HIGH

CVE-2026-81688: openssl_encrypt before 1.4.9 Plaintext Confirmation Oracle via SHA-256

Vendor Jahlives
Product openssl_encrypt
Weakness CWE-311 · Missing encryption
Published August 27, 2026
Last update August 27, 2026
View on NVD All CVEs

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 store an unkeyed SHA-256 hash of the plaintext in the cleartext file header metadata. Attackers can read this hash without the password to confirm guessed plaintexts offline or fingerprint identical plaintexts across separately-encrypted files.

Key dates

02Disclosure timeline

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