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CVE-2026-74890

CVE-2026-74890 · openssl_encrypt before 1.4.0 HMAC Authentication Bypass via Environment Variable

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 9.3 · Critical · EPSS 0.2% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • openssl_encrypt

    Versions
    • ≥ 0, < 1.4.0: Affected (semver)
    • 1.4.0: Not affected (semver)

    Update to 1.4.0

  • openssl-encrypt PyPI

    Versions
    • 0.2.2
    • 0.2.3
    • 0.2.4
    • 0.2.5
    • 0.2.6
    • 0.3.0
    • 0.3.1
    • 0.3.2
    • 0.3.3
    • 0.4.0
    • 0.4.1
    • 0.4.2
    • 0.4.3
    • 0.4.4
    • 0.5.0
    • 0.5.1
    • 0.5.3
    • 0.6.0rc1
    • 0.7.0rc2
    • 0.7.1
    • 0.7.2
    • 0.8.0
    • 0.8.1
    • 0.8.2
    • 0.9.2
    • 1.0.0
    • 1.0.1
    • 1.0.2
    • 1.0.3
    • 1.1.0
    • 1.2.0
    • 1.2.1
    • 1.3.0
    • 1.3.1
    • 1.3.2
    • 1.3.3
    • 1.3.4
    • 1.3.5
    • 1.4.0b3
    • 1.4.0b4
    • 1.4.0b5
    • 1.4.0b6
    • 1.4.0b7
    • 1.4.0b8
    Affected ranges
    • ECOSYSTEM: < 1.4.0

    Update to 1.4.0

Original sources

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