Vulnerability DatabaseCVE-2026-34874
Mend.io Vulnerability Database
The largest open source vulnerability database
What is a Vulnerability ID?
New vulnerability? Tell us about it!
CVE-2026-34874
Published:April 01, 2026
Updated:May 16, 2026
An issue was discovered in Mbed TLS through 3.6.5 and 4.x through 4.0.0. There is a NULL pointer dereference in distinguished name parsing that allows an attacker to write to address 0.
Affected Packages
mbedtls (CONAN):
Affected version(s) >=3.5.0 <3.6.6
Fix Suggestion:
Update to version 3.6.6
https://github.com/Mbed-TLS/mbedtls.git (GITHUB):
Affected version(s) =v4.0.0 <v4.1.0
Fix Suggestion:
Update to version v4.1.0
https://github.com/Mbed-TLS/mbedtls.git (GITHUB):
Affected version(s) >=mbedtls-3.5.0 <mbedtls-3.6.6
Fix Suggestion:
Update to version mbedtls-3.6.6
https://github.com/Mbed-TLS/mbedtls.git (GITHUB):
Affected version(s) >=v3.5.0 <v3.6.6
Fix Suggestion:
Update to version v3.6.6
https://github.com/Mbed-TLS/mbedtls.git (GITHUB):
Affected version(s) =mbedtls-4.0.0 <mbedtls-4.1.0
Fix Suggestion:
Update to version mbedtls-4.1.0
Related Resources (2)
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-null-pointer-dereference-x509/
https://mbed-tls.readthedocs.io/en/latest/security-advisories/
Do you need more information?
Contact Us
CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
NULL Pointer Dereference
CWE-476
EPSS
Base Score:
0.08