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CVE-2026-81721

CVE-2026-81721 · openssl_encrypt before 1.4.9 Denial of Service via KDF

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

openssl_encrypt before 1.4.9 fails to validate KDF cost parameters in encrypted file metadata and keystore headers, allowing attackers to trigger unbounded memory allocation. Attackers can craft malicious encrypted files declaring arbitrarily large Argon2, scrypt, or balloon KDF parameters to exhaust system memory and crash the process without authentication.

CVSS 8.7 · High · EPSS 0.6% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • openssl_encrypt

    Versions
    • ≥ 0, < 1.4.9: Affected (semver)
    • 1.4.9: Not affected (semver)

    Update to 1.4.9

  • 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
    • 1.4.0
    • 1.4.0b3
    • 1.4.0b4
    • 1.4.0b5
    • 1.4.0b6
    • 1.4.0b7
    • 1.4.0b8
    • 1.4.1
    • 1.4.1rc2
    • 1.4.2
    • 1.4.4
    • 1.4.5
    • 1.4.6
    • 1.4.7
    • 1.4.8
    Affected ranges
    • ECOSYSTEM: < 1.4.9

    Update to 1.4.9

Original sources

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