# CVE-2026-81688

## Summary

- **CVE ID:** CVE-2026-81688
- **Severity:** HIGH
- **CVSS Score:** 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)
- **CWE:** CWE-311
- **Published:** Aug 27, 2026
- **Last Modified:** Aug 27, 2026

## Description

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.

## Affected Products

- jahlives — openssl_encrypt (0)
- jahlives — openssl_encrypt (1.4.9)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.20%
- **EPSS Percentile:** 9.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._