CVE-2025-48965 Null dereference in mbedtls

What is CVE-2025-48965?

CVE-2025-48965 is a medium-severity vulnerability in Arm Mbed Tls, published on 20 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Mbed TLS before 3.6.4 has a NULL pointer dereference because mbedtls_asn1_store_named_data can trigger conflicting data with val.p of NULL but val.len greater than zero.

Weakness: CWE-476, CWE-696

Which versions are affected by CVE-2025-48965?

It affects 1 product.

Products include Arm Mbed Tls.

How do I fix CVE-2025-48965?

Upgrade to a fixed version.

Is CVE-2025-48965 being exploited?

There is no known exploitation of CVE-2025-48965 in the wild and no public exploit code.

Other vulnerabilities in Arm Mbed Tls

• CVE-2026-34877 Deserialization in n/a Critical 9.8
• CVE-2022-46393 Memory corruption in n/a Critical 9.8
• CVE-2021-44732 Use after free in n/a Critical 9.8
• CVE-2017-18187 Integer overflow in n/a Critical 9.8
• CVE-2018-0487 Memory corruption in ARM mbed TLS before 1.3.22, before 2.1.10, and before 2.7.0 Critical 9.8

All Arm Mbed Tls vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2025-48965, DEBIAN-CVE-2025-48965, GHSA-qxjv-288g-w43x, JLSEC-2025-230, ROOT-OS-DEBIAN-12-CVE-2025-48965, UBUNTU-CVE-2025-48965.