CVE-2026-13573 llvm llvm-project ValueSymbolTable ValueSymbolTable.cpp insert stack-based overflow
A stack-based buffer overflow in LLVM's ValueSymbolTable allows local attackers to potentially execute code or cause denial of service, though the vendor disputes its security impact.
- 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-2026-13573?
CVE-2026-13573 is a medium-severity memory corruption vulnerability in llvm-project, published on 29 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was found in llvm llvm-project up to 22.1.6. This affects the function llvm::StringMap::insert in the library /lib/IR/ValueSymbolTable.cpp of the component ValueSymbolTable Module. The manipulation results in stack-based buffer overflow. Attacking locally is a requirement. The exploit has been made public and could be used. The presence of this vulnerability remains uncertain at this time. The LLVM project explains, that the reported behavior is outside its documented security scope and therefore not considered a security vulnerability.
Which versions are affected by CVE-2026-13573?
How do I fix CVE-2026-13573?
No fix published yet.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-13573 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13573 exists.
Sources
Also known as DEBIAN-CVE-2026-13573, GHSA-p6v6-grg5-r9mw, UBUNTU-CVE-2026-13573.