CVE-2026-34877

Q: What is the severity of CVE-2026-34877?

CVE-2026-34877 is classified as a critical vulnerability due to its potential for arbitrary code execution.

Q: How do I fix CVE-2026-34877?

To fix CVE-2026-34877, upgrade Mbed TLS to version 3.6.6 or later, or version 4.0.1 or later.

Q: What versions are affected by CVE-2026-34877?

CVE-2026-34877 affects Mbed TLS versions from 2.19.0 up to 3.6.5 and version 4.0.0.

Q: What exploits are possible with CVE-2026-34877?

Exploiting CVE-2026-34877 may lead to memory corruption resulting in arbitrary code execution.

Q: Who is impacted by CVE-2026-34877?

Anyone using the affected Mbed TLS versions in their applications or systems is at risk due to CVE-2026-34877.

Published Apr 2, 2026

Updated

An issue was discovered in Mbed TLS versions from 2.19.0 up to 3.6.5, Mbed TLS 4.0.0. Insufficient protection of serialized SSL context or session structures allows an attacker who can modify the serialized structures to induce memory corruption, leading to arbitrary code execution. This is caused by Incorrect Use of Privileged APIs.

Affected Software

2 affected components

Arm mbed TLS>=2.19.0<3.6.6

Arm mbed TLS=4.0.0

Event History

Apr 2, 2026

CVE Published

via MITRE·12:00 AM

Data Sourced

via MITRE·12:00 AM

Description

Data Sourced

via NVD·05:16 PM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2026-34877?

CVE-2026-34877 is classified as a critical vulnerability due to its potential for arbitrary code execution.

How do I fix CVE-2026-34877?

To fix CVE-2026-34877, upgrade Mbed TLS to version 3.6.6 or later, or version 4.0.1 or later.

What versions are affected by CVE-2026-34877?

CVE-2026-34877 affects Mbed TLS versions from 2.19.0 up to 3.6.5 and version 4.0.0.

What exploits are possible with CVE-2026-34877?

Exploiting CVE-2026-34877 may lead to memory corruption resulting in arbitrary code execution.

Who is impacted by CVE-2026-34877?

Anyone using the affected Mbed TLS versions in their applications or systems is at risk due to CVE-2026-34877.

Company

Resources

Contact

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