NULL Pointer Dereference in Mbed TLS Affects Various Versions from Arm
CVE-2026-34874

7.5HIGH

Key Information:

Vendor

Arm
Status
Mbed TLS
Vendor
CVE Published:
1 April 2026

What is CVE-2026-34874?

A vulnerability exists in Mbed TLS versions 3.6.5 and 4.0.0, where a NULL pointer dereference can occur during distinguished name parsing. This flaw permits an attacker to write to address 0, potentially leading to system compromise. It's crucial for users of affected versions to implement updates or patches to secure their systems against this type of attack.

References

https://mbed-tls.readthedocs.io/en/latest/security-adviso...
https://mbed-tls.readthedocs.io/en/latest/security-adviso...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.