CVE-2026-81880 radare2: Uncontrolled resource consumption in radare2 PEF loader
An attacker can cause denial of service in radare2 by providing a crafted Apple PEF file that triggers excessive CPU consumption during loading.
- 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
- Available
What is CVE-2026-81880?
CVE-2026-81880 is a medium-severity denial of service vulnerability in Radare Radare2, published on 22 Sep 2026. 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
radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's Apple Preferred Executable Format loader was vulnerable because the PEF loader accepted relocSecCount values that were not bounded by the number of sections or complete relocation records in the input. The vulnerability is triggered by normal binary-format auto-detection of a small crafted Apple PEF file. The loader could perform up to 268,435,456 relocation-section iterations and repeated buffer operations after record offsets passed the end of the file. This can cause denial of service through excessive CPU consumption and prolonged processing. This issue is fixed in version 6.2.0.
Which versions are affected by CVE-2026-81880?
It affects 1 product.
Products include Radare Radare2.
How do I fix CVE-2026-81880?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-81880 being exploited?
There is no known exploitation of CVE-2026-81880 in the wild and no public exploit code.
Other vulnerabilities in Radare Radare2
Sources
Also known as GHSA-fg6f-rj8g-25pq, UBUNTU-CVE-2026-81880.