Timing Attack Affecting cryptography package, versions [44.0.0, 50.0.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-CRYPTOGRAPHY-18516621
- published4 Aug 2026
- disclosed4 Aug 2026
- creditX1AOxiang
Introduced: 4 Aug 2026
NewCVE-2026-69247 (opens in a new tab)How to fix?
Upgrade cryptography to version 50.0.0 or higher.
Overview
Affected versions of this package are vulnerable to Timing Attack in the pkcs7_decrypt_der, pkcs7_decrypt_pem, and pkcs7_decrypt_smime functions. An attacker can obtain sensitive information about the outcome of RSA decryption operations by submitting crafted EnvelopedData and analyzing error messages or timing differences. This can be exploited to perform adaptive chosen ciphertext attacks against the content-encryption key.
Note: This is only exploitable if the application automatically decrypts untrusted EnvelopedData matching the victim certificate and provides adaptive responses at high volume, such as in S/MIME gateways or mail filters, and if the linked cryptographic library lacks implicit rejection (e.g., OpenSSL 3.0/3.1, LibreSSL, BoringSSL).