CVE-2026-28390
Possible NULL Dereference When Processing CMS KeyTransportRecipientInfo
Description
Issue summary: During processing of a crafted CMS EnvelopedData message with KeyTransportRecipientInfo a NULL pointer dereference can happen. Impact summary: Applications that process attacker-controlled CMS data may crash before authentication or cryptographic operations occur resulting in Denial of Service. When a CMS EnvelopedData message that uses KeyTransportRecipientInfo with RSA-OAEP encryption is processed, the optional parameters field of RSA-OAEP SourceFunc algorithm identifier is examined without checking for its presence. This results in a NULL pointer dereference if the field is missing. Applications and services that call CMS_decrypt() on untrusted input (e.g., S/MIME processing or CMS-based protocols) are vulnerable. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.
INFO
Published Date :
April 7, 2026, 10:16 p.m.
Last Modified :
April 23, 2026, 3:39 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update OpenSSL to the latest stable version.
- Apply vendor-supplied security patches.
- Review CMS processing logic for robustness.
- Validate all input before processing.
Public PoC/Exploit Available at Github
CVE-2026-28390 has a 6 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-28390.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-28390 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-28390
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Secure Node.js Alpine base image with zero CVEs — patches npm bundled packages, upgrades corepack pnpm to v10, closes all known Trivy vulnerabilities for langfuse and similar projects
Dockerfile
trivy-nginx-scan
None
Python Dockerfile
All Public RunWhen Helm Charts - Managed by terraform
Shell Dockerfile Go Template
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-28390 vulnerability anywhere in the article.
-
TheCyberThrone
OpenSSL 3.6.2: The Moderate Severity Wave
OpenSSL 3.6.2 landed this week carrying eight CVE fixes, with the project rating the most severe issue as Moderate. On the surface, that sounds reassuring—no critical exploits, no ransomware-grade zer ... Read more
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CybersecurityNews
Multiple OpenSSL Vulnerabilities Exposes Sensitive Data in RSA KEM Handling
OpenSSL has released a broad April 2026 security update that fixes seven vulnerabilities across supported branches, led by CVE-2026-31790, a moderate-severity flaw in RSA KEM RSASVE encapsulation that ... Read more
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Help Net Security
OpenSSL 3.6.2 lands with eight CVE fixes
OpenSSL 3.6.2 patches eight CVEs across a range of components. The project rates the most severe issue in the release as Moderate. What got fixed The release fixes incorrect failure handling in RSA KE ... Read more
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Daily CyberSecurity
OpenSSL Issues Major Security Advisory: RSA and Memory Vulnerabilities Fixed
OpenSSL has released a comprehensive security advisory detailing seven vulnerabilities ranging from Moderate to Low severity. The report, dated April 7, 2026, highlights critical fixes for modern vers ... Read more
The following table lists the changes that have been made to the
CVE-2026-28390 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 23, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.0.0 up to (excluding) 3.0.20 *cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.3.0 up to (excluding) 3.3.7 *cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.4.0 up to (excluding) 3.4.5 *cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.5.0 up to (excluding) 3.5.6 *cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.6.0 up to (excluding) 3.6.2 *cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 1.0.2 up to (excluding) 1.0.2zp *cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 1.1.1 up to (excluding) 1.1.1zg Added Reference Type OpenSSL Software Foundation: https://github.com/openssl/openssl/commit/01194a8f1941115cd0383bfa91c736dd3993c8bc Types: Patch Added Reference Type OpenSSL Software Foundation: https://github.com/openssl/openssl/commit/2e39b7a6993be445fddb9fbce316fa756e0397b6 Types: Patch Added Reference Type OpenSSL Software Foundation: https://github.com/openssl/openssl/commit/af2a5fecd3e71a29e7568f9c1453dec5cebbaff4 Types: Patch Added Reference Type OpenSSL Software Foundation: https://github.com/openssl/openssl/commit/ea7b4ea4f9f853521ba34830cbcadc970d2e0788 Types: Patch Added Reference Type OpenSSL Software Foundation: https://github.com/openssl/openssl/commit/fd2f1a6cf53b9ceeca723a001aa4b825d7c7ee75 Types: Patch Added Reference Type OpenSSL Software Foundation: https://openssl-library.org/news/secadv/20260407.txt Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 10, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H -
New CVE Received by [email protected]
Apr. 07, 2026
Action Type Old Value New Value Added Description Issue summary: During processing of a crafted CMS EnvelopedData message with KeyTransportRecipientInfo a NULL pointer dereference can happen. Impact summary: Applications that process attacker-controlled CMS data may crash before authentication or cryptographic operations occur resulting in Denial of Service. When a CMS EnvelopedData message that uses KeyTransportRecipientInfo with RSA-OAEP encryption is processed, the optional parameters field of RSA-OAEP SourceFunc algorithm identifier is examined without checking for its presence. This results in a NULL pointer dereference if the field is missing. Applications and services that call CMS_decrypt() on untrusted input (e.g., S/MIME processing or CMS-based protocols) are vulnerable. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary. Added CWE CWE-476 Added Reference https://github.com/openssl/openssl/commit/01194a8f1941115cd0383bfa91c736dd3993c8bc Added Reference https://github.com/openssl/openssl/commit/2e39b7a6993be445fddb9fbce316fa756e0397b6 Added Reference https://github.com/openssl/openssl/commit/af2a5fecd3e71a29e7568f9c1453dec5cebbaff4 Added Reference https://github.com/openssl/openssl/commit/ea7b4ea4f9f853521ba34830cbcadc970d2e0788 Added Reference https://github.com/openssl/openssl/commit/fd2f1a6cf53b9ceeca723a001aa4b825d7c7ee75 Added Reference https://openssl-library.org/news/secadv/20260407.txt