---
id: CVE-2026-22795
title: Missing ASN1_TYPE validation in PKCS#12 parsing
summary: |-
  Issue summary: An invalid or NULL pointer dereference can happen in
  an application processing a malformed PKCS#12 file.

  Impact summary: An application processing a malformed PKCS#12 file can be
  caused to dereference an invalid or NULL p…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: adp
cwe:
  - CWE-754
vendor: OpenSSL
product: OpenSSL
affected:
  - OpenSSL >= 3.6.0 < 3.6.1
  - OpenSSL >= 3.5.0 < 3.5.5
  - OpenSSL >= 3.4.0 < 3.4.4
  - OpenSSL >= 3.3.0 < 3.3.6
  - OpenSSL >= 3.0.0 < 3.0.19
  - OpenSSL >= 1.1.1 < 1.1.1ze
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-01-28T20:03:18.604129Z'
published: '2026-01-27'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:12:20.101Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-22795'
references:
  - url: 'https://openssl-library.org/news/secadv/20260127.txt'
    label: OpenSSL Advisory
  - url: >-
      https://github.com/openssl/openssl/commit/ef2fb66ec571564d64d1c74a12e388a2a54d05d2
    label: 3.6.1 git commit
  - url: >-
      https://github.com/openssl/openssl/commit/2502e7b7d4c0cf4f972a881641fe09edc67aeec4
    label: 3.5.5 git commit
  - url: >-
      https://github.com/openssl/openssl/commit/7bbca05be55b129651d9df4bdb92becc45002c12
    label: 3.4.4 git commit
  - url: >-
      https://github.com/openssl/openssl/commit/eeee3cbd4d682095ed431052f00403004596373e
    label: 3.3.6 git commit
  - url: >-
      https://github.com/openssl/openssl/commit/572844beca95068394c916626a6d3a490f831a49
    label: 3.0.19 git commit
tags:
  - cve.org
epss: 0.00169
epssPercentile: 0.05826
ingestedAt: '2026-10-15T05:52:46.047Z'
---

## Overview

Issue summary: An invalid or NULL pointer dereference can happen in
an application processing a malformed PKCS#12 file.

Impact summary: An application processing a malformed PKCS#12 file can be
caused to dereference an invalid or NULL pointer on memory read, resulting
in a Denial of Service.

A type confusion vulnerability exists in PKCS#12 parsing code where
an ASN1_TYPE union member is accessed without first validating the type,
causing an invalid pointer read.

The location is constrained to a 1-byte address space, meaning any
attempted pointer manipulation can only target addresses between 0x00 and 0xFF.
This range corresponds to the zero page, which is unmapped on most modern
operating systems and will reliably result in a crash, leading only to a
Denial of Service. Exploiting this issue also requires a user or application
to process a maliciously crafted PKCS#12 file. It is uncommon to accept
untrusted PKCS#12 files in applications as they are usually used to store
private keys which are trusted by definition. For these reasons, the issue
was assessed as Low severity.

The FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,
as the PKCS12 implementation is outside the OpenSSL FIPS module boundary.

OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0 and 1.1.1 are vulnerable to this issue.

OpenSSL 1.0.2 is not affected by this issue.

## Affected

- `OpenSSL >= 3.6.0 < 3.6.1`
- `OpenSSL >= 3.5.0 < 3.5.5`
- `OpenSSL >= 3.4.0 < 3.4.4`
- `OpenSSL >= 3.3.0 < 3.3.6`
- `OpenSSL >= 3.0.0 < 3.0.19`
- `OpenSSL >= 1.1.1 < 1.1.1ze`

## Remediation

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