Vulnerability · Published Aug 17, 2026 · Assigned by VulnCheck

CVE-2026-74877openssl_encrypt before 1.4.0 Missing Ownership Verification via revoke_key

High 8.8

In plain English

A high-severity authorization bypass via user-controlled key 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 0.5% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.5%top 60.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

openssl_encrypt versions before 1.4.0 contain a missing ownership verification vulnerability in the revoke_key method that allows authenticated clients to revoke any other client's key. Attackers can revoke arbitrary keys by providing a valid ML-DSA signature, bypassing the intended ownership restriction.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	openssl-encrypt	1.4.0	GHSA-hvc7-763r-4f3h
PyPI	openssl-encrypt	1.4.0	PYSEC-2026-3743

Affected products (as reported)

Vendor	Product	Versions
jahlives	openssl_encrypt	0 – before 1.4.0

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-hvc7-763r-4f3h) vendor-advisory
VulnCheck Advisory: openssl_encrypt before 1.4.0 Missing Ownership Verification via revoke_key third-party-advisory