SB2026080115 - Information Exposure Through an Error Message in python-cryptography

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026080115

SB2026080115 - Information Exposure Through an Error Message in python-cryptography

Published: August 1, 2026

Security Bulletin ID SB2026080115
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Information Exposure Through an Error Message (CVE-ID: N/A)

CWE-ID: CWE-209 - Information Exposure Through an Error Message

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to recover plaintext from PKCS#7 EnvelopedData messages.

The vulnerability exists due to generation of error message containing sensitive information and observable timing discrepancy in pkcs7_decrypt_der, pkcs7_decrypt_pem, and pkcs7_decrypt_smime when decrypting attacker-supplied EnvelopedData. A remote attacker can send crafted EnvelopedData messages and observe distinguishable errors and timing differences to recover plaintext from PKCS#7 EnvelopedData messages.

Exploitation requires a service that automatically decrypts untrusted EnvelopedData for the victim certificate and returns adaptive responses at high volume.


Remediation

Install update from vendor's website.

References