Vulnerability · Published Aug 27, 2026 · Assigned by VulnCheck
CVE-2026-81688openssl_encrypt before 1.4.9 Plaintext Confirmation Oracle via SHA-256
High 7.5
In plain English
A high-severity security flaw in openssl_encrypt from jahlives. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.3%top 80.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | openssl-encrypt | 1.4.9 | PYSEC-2026-3795 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| jahlives | openssl_encrypt | 0 – before 1.4.9 |
Weakness: CWE-311 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- GitHub Security Advisory (GHSA-7c3q-gp4v-q29q) vendor-advisory
- VulnCheck Advisory: openssl_encrypt before 1.4.9 Plaintext Confirmation Oracle via SHA-256 third-party-advisory