CVE-2026-42766

Published: Giu 09, 2026 Last Modified: Giu 15, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 5,9
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Attack Vector: network
Attack Complexity: high
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high

Description

AI Translation Available

Issue summary: A specially crafted password-encrypted CMS message
can trigger a NULL pointer dereference during CMS decryption.

Impact summary: This NULL pointer dereference leads to an application crash
and a Denial of Service.

The CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as
OPTIONAL in the ASN.1 specification and may therefore be absent in specially
crafted inputs. During the password-based CMS decryption the OpenSSL
CMS implementation dereferences this field without first checking whether it
was present.

An attacker who supplies such a CMS message to an application performing
password-based CMS decryption can trigger an application crash, leading to
a Denial of Service.

Applications that process password-encrypted CMS messages may be affected.

The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this
issue, as the affected code is outside the OpenSSL FIPS module boundary.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0007
Percentile
0,2th
Updated

EPSS Score Trend (Last 6 Days)

476

NULL Pointer Dereference

Stable
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Availability Integrity Confidentiality
Potential Impacts:
Dos: Crash, Exit, Or Restart Execute Unauthorized Code Or Commands Read Memory Modify Memory
Applicable Platforms
Languages: C, C++, Java, C#, Go
Likelihood of Exploit: Medium
View CWE Details
Application

Openssl by Openssl

Product Information
Vendor Openssl
Product Openssl
Version Range Affected
From 1.1.1 (inclusive)
To 1.1.1zh (exclusive)
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Openssl by Openssl

Product Information
Vendor Openssl
Product Openssl
Version Range Affected
From 3.5.0 (inclusive)
To 3.5.7 (exclusive)
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Openssl by Openssl

Product Information
Vendor Openssl
Product Openssl
Version 4.0.0
cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Openssl by Openssl

Product Information
Vendor Openssl
Product Openssl
Version Range Affected
From 3.4.0 (inclusive)
To 3.4.6 (exclusive)
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Openssl by Openssl

Product Information
Vendor Openssl
Product Openssl
Version Range Affected
From 3.6.0 (inclusive)
To 3.6.3 (exclusive)
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Openssl by Openssl

Product Information
Vendor Openssl
Product Openssl
Version Range Affected
From 3.0.0 (inclusive)
To 3.0.21 (exclusive)
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Openssl by Openssl

Product Information
Vendor Openssl
Product Openssl
Version Range Affected
From 1.0.2 (inclusive)
To 1.0.2zq (exclusive)
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://github.com/openssl/openssl/commit/056d06c1918fafbb9…
https://github.com/openssl/openssl/commit/056d06c1918fafbb98c1c85a02e4c47cc4e19…
https://github.com/openssl/openssl/commit/12bc26ffb3a2be728…
https://github.com/openssl/openssl/commit/12bc26ffb3a2be728c9b86e1cae277de5b33d…
https://github.com/openssl/openssl/commit/3ff64913615d648cf…
https://github.com/openssl/openssl/commit/3ff64913615d648cfbb6a6f1cf5529ae7ea82…
https://github.com/openssl/openssl/commit/ab52d88cb5374876d…
https://github.com/openssl/openssl/commit/ab52d88cb5374876d59aee3c91f9e4ccce2b7…
https://github.com/openssl/openssl/commit/da26f368732b83e40…
https://github.com/openssl/openssl/commit/da26f368732b83e40e9d356fe61c3d3aaab6d…
https://openssl-library.org/news/secadv/20260609.txt
https://openssl-library.org/news/secadv/20260609.txt