CVE-2026-81688

EUVD-2026-67044
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 18.03%
Affected Products (NVD)
VendorProductVersion
jahlivesopenssl_encrypt
𝑥
< 1.4.9
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-7c3q-gp4v-q29q
https://www.vulncheck.com/advisories/openssl-encrypt-before-1.4.9-plaintext-confirmation-oracle-via-sha-256