---
id: CVE-2026-69247
title: >-
  cryptography is a package designed to expose cryptographic primitives and
  recipes to Python developers
summary: >-
  cryptography is a package designed to expose cryptographic primitives and
  recipes to Python developers. From 44.0.0 until 50.0.0, pkcs7_decrypt_der,
  pkcs7_decrypt_pem, and pkcs7_decrypt_smime reported the outcome of decrypting
  a Recipien…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-208
  - CWE-209
vendor: Red Hat
product: Red Hat Enterprise Linux 10
affected:
  - enterprise_linux 10
  - enterprise_linux 9
  - hardened_images
patched:
  - hardened_images
published: '2026-08-03'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T20:36:14.340'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-69247'
references:
  - url: >-
      https://github.com/pyca/cryptography/commit/53fccd93413a8d7f07d6d8999681f27b75cffa3f
    label: security-advisories@github.com
  - url: 'https://github.com/pyca/cryptography/pull/15369'
    label: security-advisories@github.com
  - url: >-
      https://github.com/pyca/cryptography/security/advisories/GHSA-g6cj-pr64-35w5
    label: security-advisories@github.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-69247.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-69247'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2510835'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-69247'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-69247'
  - url: 'https://access.redhat.com/errata/RHSA-2026:55543'
  - url: 'https://github.com/advisories/GHSA-g6cj-pr64-35w5'
  - url: 'https://github.com/pyca/cryptography'
  - url: 'https://access.redhat.com/errata/RHSA-2026:70965'
  - url: 'https://access.redhat.com/errata/RHSA-2026:70979'
  - url: 'https://access.redhat.com/errata/RHSA-2026:70995'
  - url: 'https://access.redhat.com/errata/RHSA-2026:70969'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - ghsa
  - pip
  - osv
epss: 0.00274
epssPercentile: 0.17619
aliases:
  - GHSA-g6cj-pr64-35w5
  - PYSEC-2026-3552
ecosystem: pip
cvssSource: vendor
ingestedAt: '2026-08-03T21:30:01.446Z'
---

## Overview

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. From 44.0.0 until 50.0.0, pkcs7_decrypt_der, pkcs7_decrypt_pem, and pkcs7_decrypt_smime reported the outcome of decrypting a RecipientInfo's encryptedKey in several distinguishable ways, one of which disclosed the exact length recovered from the RSA operation. The same distinction was also observable by timing. An application that decrypts attacker-supplied EnvelopedData and reflects the outcome gives the attacker a Bleichenbacher oracle against the content-encryption key. Decryption ran as RSA PKCS#1 v1.5 decrypt of encryptedKey, build an AES cipher from the result, then AES-CBC decrypt and PKCS#7 unpad. Invalid RSA padding, a valid padding with a bad key length, a correct length with a wrong key, and the real key each failed or succeeded differently. Case 1 is reachable only where the linked library lacks implicit rejection: OpenSSL 3.0 and 3.1, LibreSSL, and BoringSSL. Exploitation requires a service that auto-decrypts untrusted EnvelopedData matching the victim certificate and answers adaptively at high volume, such as an S/MIME gateway or mail filter. This issue is fixed in 50.0.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-69247)

Affected packages:

- `cryptography >= 44.0.0, < 50.0.0`

Patched in:

- `cryptography 50.0.0`

Source: https://github.com/advisories/GHSA-g6cj-pr64-35w5

## Vendor advisories

- **RHSA-2026:55543** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:55543)
- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-69247.json)
- **RHSA-2026:70965** · Red Hat · fixed in: Red Hat AI Inference Server 3.4 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70965)
- **RHSA-2026:70979** · Red Hat · fixed in: Red Hat AI Inference Server 3.4 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70979)
- **RHSA-2026:70995** · Red Hat · fixed in: Red Hat AI Inference Server 3.4 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70995)
- **RHSA-2026:70969** · Red Hat · fixed in: Red Hat AI Inference Server 3.4 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70969)