CVE-2025-66866 Denial of service in n/a
Attackers can cause a denial of service in BinUtils by providing a crafted PE file to the demangler function.
- 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-2025-66866?
CVE-2025-66866 is a medium-severity denial of service vulnerability in Gnu Binutils, published on 29 Dec 2025. 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
An issue was discovered in function d_abi_tags in file cp-demangle.c in BinUtils 2.26 allows attackers to cause a denial of service via crafted PE file.
Weakness: CWE-20
Which versions are affected by CVE-2025-66866?
It affects 1 product.
Products include Gnu Binutils.
How do I fix CVE-2025-66866?
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-2025-66866 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66866 exists.
Other vulnerabilities in Gnu Binutils
Sources
Also known as DEBIAN-CVE-2025-66866, ECHO-ace7-c390-7813, GHSA-gjrj-58f4-pgrh, ROOT-OS-DEBIAN-12-CVE-2025-66866, UBUNTU-CVE-2025-66866.