CVE-2026-4174 Radare2 Mach-O File mach0.c walk_exports_trie resource consumption
A local attacker can cause resource consumption in Radare2 via a crafted Mach-O file, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-4174?
CVE-2026-4174 is a medium-severity denial of service vulnerability in Radare2, published on 15 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability has been found in Radare2 5.9.9. This issue affects the function walk_exports_trie of the file libr/bin/format/mach0/mach0.c of the component Mach-O File Parser. Such manipulation leads to resource consumption. The attack can only be performed from a local environment. The exploit has been disclosed to the public and may be used. The existence of this vulnerability is still disputed at present. Upgrading to version 6.1.2 is capable of addressing this issue. The name of the patch is 4371ae84c99c46b48cb21badbbef06b30757aba0. You should upgrade the affected component. The code maintainer states that, "[he] wont consider this bug a DoS".
Which versions are affected by CVE-2026-4174?
How do I fix CVE-2026-4174?
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-2026-4174 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4174 exists.
Sources
Also known as GHSA-fwp9-q76v-g574, UBUNTU-CVE-2026-4174.