OpenSSL up to 3.6.1 CMS KeyTransportRecipientInfo CMS_decrypt null pointer dereference

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in OpenSSL up to 3.6.1. Affected by this issue is the function CMS_decrypt of the component CMS KeyTransportRecipientInfo Handler. Executing a manipulation can lead to null pointer dereference. This vulnerability is handled as CVE-2026-28390. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic was found in OpenSSL up to 3.6.1. This vulnerability affects the function CMS_decrypt of the component CMS KeyTransportRecipientInfo Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability.

The weakness was released by Muhammad Daffa. The advisory is available at openssl-library.org. This vulnerability was named CVE-2026-28390. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 06/20/2026).

The vulnerability scanner Nessus provides a plugin with the ID 306295 (Amazon Linux 2 : openssl11, --advisory ALAS2-2026-3249 (ALAS-2026-3249)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.0.2zp, 1.1.1zg, 3.0.20, 3.3.7, 3.4.5, 3.5.6 or 3.6.2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (306295), EUVD (EUVD-2026-19966) and CERT Bund (WID-SEC-2026-0995). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • IBM AIX
  • IBM VIOS
  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Red Hat Ansible Automation Platform
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • NetApp AFF
  • SUSE openSUSE
  • RESF Rocky Linux
  • IBM MQ
  • NetApp FAS
  • Microsoft Azure Linux
  • Open Source OpenSSL
  • NCP Secure Enterprise VPN Server

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 306295
Nessus Name: Amazon Linux 2 : openssl11, --advisory ALAS2-2026-3249 (ALAS-2026-3249)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: OpenSSL 1.0.2zp/1.1.1zg/3.0.20/3.3.7/3.4.5/3.5.6/3.6.2

Timelineinfo

04/07/2026 Advisory disclosed
04/07/2026 +0 days VulDB entry created
06/20/2026 +74 days VulDB entry last update

Sourcesinfo

Product: openssl.org

Advisory: openssl-library.org
Researcher: Muhammad Daffa
Status: Confirmed

CVE: CVE-2026-28390 (🔒)
GCVE (CVE): GCVE-0-2026-28390
GCVE (VulDB): GCVE-100-355906
EUVD: 🔒
CERT Bund: WID-SEC-2026-0995 - OpenSSL: Mehrere Schwachstellen

Entryinfo

Created: 04/07/2026 21:15
Updated: 06/20/2026 04:23
Changes: 04/07/2026 21:15 (54), 04/08/2026 02:32 (1), 04/14/2026 17:04 (2), 05/02/2026 08:13 (7), 06/10/2026 05:32 (1), 06/20/2026 04:23 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to stay up to date on a daily basis?

Enable the mail alert feature now!