CVE-2026-81886 radare2: Uncontrolled memory allocation in radare2 dmp64 parser
An attacker can cause denial of service in radare2 by providing a crafted Windows crash dump that triggers excessive memory allocation.
- 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-2026-81886?
CVE-2026-81886 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 Windows 64-bit crash-dump dmp64 parser was vulnerable because the Windows dmp64 parser used an input-controlled physical-memory-run PageCount directly as the bound of a per-page allocation loop. The vulnerability is triggered by opening a small crafted full-memory Windows crash dump. The parser repeatedly allocated and appended page descriptors without validating the count against the dump size. This can cause denial of service through excessive memory consumption and processing time. This issue is fixed in version 6.2.0.
Weakness: CWE-770
Which versions are affected by CVE-2026-81886?
It affects 1 product.
Products include Radare Radare2.
How do I fix CVE-2026-81886?
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-2026-81886 being exploited?
There is no known exploitation of CVE-2026-81886 in the wild and no public exploit code.
Other vulnerabilities in Radare Radare2
Sources
Also known as GHSA-3xrx-wh64-8xr8, UBUNTU-CVE-2026-81886.