CVE-2026-34874
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductTrustedfirmware Mbed Tls
PublishedApr 1, 2026
First seenApr 1, 2026
Weakness typeCWE-476NULL pointer dereference
How to fix
Update
- trustedfirmware mbed_tls3.6.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| trustedfirmware mbed_tls | 3.5.0 ≤ v < 3.6.6, 4.0.0 | 3.6.6 |
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