CVE-2026-74890: openssl_encrypt versions before 1.4.0 contain an authentication bypass vulnerability in CamelliaCipher that di

Routine

MEDIUM 5.5WATCHLISTUPGRADE

CVE-2026-74890 is a medium-severity flaw (CVSS 5.5) 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 an authentication bypass vulnerability in CamelliaCipher that disables HMAC tag generation and verification when the PYTEST_CURRENT_TEST environment variable is set. Attackers with code execution can set this environment variable to produce unauthenticated ciphertext and bypass integrity protection on encrypted data.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-345
Published	2026-08-17
Last modified	2026-10-24

Publisher (CNA): VulnCheck · Vendor: jahlives

Am I affected?

Timeline

2026-08-17 11:16 UTCPublished CVE record published
2026-10-24 13:10 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-2026-74890?

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

Is CVE-2026-74890 being exploited?

CVE-2026-74890 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-2026-74890 affect?

CVE-2026-74890 affects openssl encrypt. Severity is medium (CVSS 5.5). openssl_encrypt versions before 1.4.0 contain an authentication bypass vulnerability in CamelliaCipher that disables HMAC tag generation and verification when the PYTEST_CURRENT_TEST environment variable is set. Attackers with code executio

How urgent is CVE-2026-74890?

Priority 27/100. On your watchlist

Software pages

OpenSSL vulnerabilities

Related CVEs

CVE-2026-74886 CRITICAL 9.8 UPGRADE openssl_encrypt versions before 1.4.0 contain a plugin sandbox bypass vulnerability where the PluginImportGuar
CVE-2026-74880 CRITICAL 9.8 UPGRADE openssl_encrypt versions before 1.4.0 accept refresh tokens as URL query parameters in keyserver and telemetry
CVE-2026-74892 HIGH 7.5 UPGRADE openssl_encrypt versions before 1.4.0 contain a hardcoded default secret key in the standalone telemetry serve

References

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