CVE-2023-26991 Use after free in n/a

High 7.8 Published 4 Apr 2023 Updated 12 Feb 2025

A stack-use-after-scope vulnerability in SWFTools allows attackers to potentially execute arbitrary code or cause denial of service via crafted SWF files.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2023-26991?

CVE-2023-26991 is a high-severity use after free vulnerability in Swftools Swftools, published on 4 Apr 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

SWFTools v0.9.2 was discovered to contain a stack-use-after-scope in the swf_ReadSWF2 function in lib/rfxswf.c.

Weakness: CWE-416

Which versions are affected by CVE-2023-26991?

It affects 1 product.

Products include Swftools Swftools.

How do I fix CVE-2023-26991?

No fix has been published for CVE-2023-26991 yet. Limit exposure of the affected software until one is available.

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-2023-26991 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-26991 exists.

All Swftools Swftools vulnerabilities

Sources

Also known as GHSA-8r7r-qmq5-vjr8, UBUNTU-CVE-2023-26991.