CVE-2026-42767
NULL Pointer Dereference in CRMF EncryptedValue Decryption
Description
Issue summary: An attacker-controlled CMP (Certificate Management Protocol) server could trigger a NULL pointer dereference in a CMP client application. Impact summary: A NULL pointer dereference causes a crash of the application and a Denial of Service. An attacker controlling a CMP server (or acting as a man-in-the-middle) could craft a CMP response containing a CRMF (Certificate Request Message Format) CertRepMessage with an EncryptedValue structure where the symmAlg field has an algorithm OID but no parameters field. When the OpenSSL CMP client processes this response, the NULL dereference occurs, causing a crash of the CMP client. Applications that process untrusted CMP/CRMF 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.
INFO
Published Date :
June 9, 2026, 5:17 p.m.
Last Modified :
June 16, 2026, 2:58 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update the CMP client application to the latest version.
- Ensure affected applications process untrusted CMP/CRMF messages securely.
Public PoC/Exploit Available at Github
CVE-2026-42767 has a 1 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-2026-42767.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-42767 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-2026-42767
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).
Tooling for generating and manipulating Software Bill of Materials (SBOMs) for OpenVox projects.
Ruby
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42767 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-42767 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.
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Initial Analysis by [email protected]
Jun. 16, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.0.0 up to (excluding) 3.0.21 *cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.4.0 up to (excluding) 3.4.6 *cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.5.0 up to (excluding) 3.5.7 *cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.6.0 up to (excluding) 3.6.3 *cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:* Added Reference Type OpenSSL Software Foundation: https://github.com/openssl/openssl/commit/61a86a8cd73546c9fea916f3d304c1293e05c046 Types: Patch Added Reference Type OpenSSL Software Foundation: https://github.com/openssl/openssl/commit/665d5254083affde9982efca7c41dd01cacc8774 Types: Patch Added Reference Type OpenSSL Software Foundation: https://github.com/openssl/openssl/commit/810b722f772652ad48042bcc7ab07e3414b11d0f Types: Patch Added Reference Type OpenSSL Software Foundation: https://github.com/openssl/openssl/commit/b90ff3b1bd33b1c18e6a09936d097c2eddef8873 Types: Patch Added Reference Type OpenSSL Software Foundation: https://github.com/openssl/openssl/commit/e6f912907fc2ec82a0fd07aae55172c5e5e3d90d Types: Patch Added Reference Type OpenSSL Software Foundation: https://openssl-library.org/news/secadv/20260609.txt Types: Vendor Advisory -
CVE Modified by [email protected]
Jun. 10, 2026
Action Type Old Value New Value Added Reference https://github.com/openssl/openssl/commit/61a86a8cd73546c9fea916f3d304c1293e05c046 Added Reference https://github.com/openssl/openssl/commit/665d5254083affde9982efca7c41dd01cacc8774 Added Reference https://github.com/openssl/openssl/commit/810b722f772652ad48042bcc7ab07e3414b11d0f Added Reference https://github.com/openssl/openssl/commit/b90ff3b1bd33b1c18e6a09936d097c2eddef8873 Added Reference https://github.com/openssl/openssl/commit/e6f912907fc2ec82a0fd07aae55172c5e5e3d90d Removed Reference https://github.com/openssl/security/commit/61a86a8cd73546c9fea916f3d304c1293e05c046 Removed Reference https://github.com/openssl/security/commit/665d5254083affde9982efca7c41dd01cacc8774 Removed Reference https://github.com/openssl/security/commit/810b722f772652ad48042bcc7ab07e3414b11d0f Removed Reference https://github.com/openssl/security/commit/b90ff3b1bd33b1c18e6a09936d097c2eddef8873 Removed Reference https://github.com/openssl/security/commit/e6f912907fc2ec82a0fd07aae55172c5e5e3d90d -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 09, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H -
New CVE Received by [email protected]
Jun. 09, 2026
Action Type Old Value New Value Added Description Issue summary: An attacker-controlled CMP (Certificate Management Protocol) server could trigger a NULL pointer dereference in a CMP client application. Impact summary: A NULL pointer dereference causes a crash of the application and a Denial of Service. An attacker controlling a CMP server (or acting as a man-in-the-middle) could craft a CMP response containing a CRMF (Certificate Request Message Format) CertRepMessage with an EncryptedValue structure where the symmAlg field has an algorithm OID but no parameters field. When the OpenSSL CMP client processes this response, the NULL dereference occurs, causing a crash of the CMP client. Applications that process untrusted CMP/CRMF 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. Added CWE CWE-476 Added Reference https://github.com/openssl/security/commit/61a86a8cd73546c9fea916f3d304c1293e05c046 Added Reference https://github.com/openssl/security/commit/665d5254083affde9982efca7c41dd01cacc8774 Added Reference https://github.com/openssl/security/commit/810b722f772652ad48042bcc7ab07e3414b11d0f Added Reference https://github.com/openssl/security/commit/b90ff3b1bd33b1c18e6a09936d097c2eddef8873 Added Reference https://github.com/openssl/security/commit/e6f912907fc2ec82a0fd07aae55172c5e5e3d90d Added Reference https://openssl-library.org/news/secadv/20260609.txt