CVE-2020-26148 Use after free in n/a

High 7.5 Published 29 Sep 2020 Updated 4 Aug 2024

Attackers can cause a denial of service via assertion failure in the md4c library by submitting a malformed Markdown document.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2020-26148?

CVE-2020-26148 is a high-severity use after free vulnerability in n/a, published on 29 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

md_push_block_bytes in md4c.c in md4c 0.4.5 allows attackers to trigger use of uninitialized memory, and cause a denial of service (e.g., assertion failure) via a malformed Markdown document.

Weakness: CWE-908

Which versions are affected by CVE-2020-26148?

It affects 1 product.

Products include Md4c Project Md4c.

How do I fix CVE-2020-26148?

Upgrade to a fixed version.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2020-26148 being exploited?

There is no known exploitation of CVE-2020-26148 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2020-26148, GHSA-8cq8-p477-7hrv, UBUNTU-CVE-2020-26148.