CVE-2026-74877: openssl_encrypt versions before 1.4.0 contain a missing ownership verification vulnerability in the revoke_key

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HIGH 8.8WATCHLISTUPGRADE

CVE-2026-74877 is a high-severity flaw (CVSS 8.8) affecting openssl encrypt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-639
Published	2026-08-17
Last modified	2026-10-08

Publisher (CNA): VulnCheck · Vendor: jahlives

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-17 11:16 UTCPublished CVE record published
2026-10-08 16:17 UTCUpdated Record last modified

jahlives openssl encrypt UPGRADE

Affected: < 1.4.0

Fixed in: 1.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show openssl-encrypt

2. UPGRADE to 1.4.0

pip install --upgrade "openssl-encrypt>=1.4.0"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-74877?

openssl encrypt: upgrade to 1.4.0. Exact commands for each OS are on this page.

Is CVE-2026-74877 being exploited?

CVE-2026-74877 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-74877 affect?

CVE-2026-74877 affects openssl encrypt. Severity is high (CVSS 8.8). 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 val

How urgent is CVE-2026-74877?

Priority 46/100. High severity; On your watchlist

Software pages

OpenSSL vulnerabilities

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References

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