CVE-2026-81688CWE-311

CVE-2026-81688

High · published August 27, 2026

CVSS v3.1

7.5

EPSS

Percentile

9.6

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 7.5 · HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0: 8.7 · 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
EPSS: 0.00198 · 9.6th percentile
Weakness: CWE-311 · Missing Encryption of Sensitive Data
Published: 2026-08-27T21:20Z

Affected products (1)

Product	Versions	Fixed in
jahlives/openssl_encrypt	< 1.4.9	1.4.9

References (2)

https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-7c3q-gp4v-q29q · [email protected]https://www.vulncheck.com/advisories/openssl-encrypt-before-1.4.9-plaintext-confirmation-oracle-via-sha-256 · [email protected]

EPSS history

Timeline

27 AUG 14:50Z
openssl_encrypt before 1.4.9 Plaintext Confirmation Oracle via SHA-256
cvelistv5