llvm llvm-project up to 22.1.6 ValueSymbolTable ValueSymbolTable.cpp llvm::StringMap::insert stack-based overflow ⚔ [Disputed]

Summaryinfo

A vulnerability marked as problematic has been reported in llvm llvm-project up to 22.1.6. This impacts the function llvm::StringMap::insert in the library /lib/IR/ValueSymbolTable.cpp of the component ValueSymbolTable Module. This manipulation causes stack-based overflow. This vulnerability is handled as CVE-2026-13573. It is possible to launch the attack on the local host. Additionally, an exploit exists. There are still doubts about whether this vulnerability truly exists. The LLVM project explains, that the reported behavior is outside its documented security scope and therefore not considered a security vulnerability.

Detailsinfo

A vulnerability classified as problematic was found in llvm llvm-project up to 22.1.6 (Programming Tool Software). Affected by this vulnerability is the function llvm::StringMap::insert in the library /lib/IR/ValueSymbolTable.cpp of the component ValueSymbolTable Module. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect availability.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-13573. The exploitation appears to be easy. An attack has to be approached locally. Technical details and also a public exploit are known.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. The real existence of this vulnerability is still doubted at the moment. The LLVM project explains, that the reported behavior is outside its documented security scope and therefore not considered a security vulnerability. The vulnerability scanner Nessus provides a plugin with the ID 323920 (Linux Distros Unpatched Vulnerability : CVE-2026-13573), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (323920). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Programming Tool Software

Vendor

• llvm

Name

• llvm-project

Version

• 22.1.0
• 22.1.1
• 22.1.2
• 22.1.3
• 22.1.4
• 22.1.5
• 22.1.6

Website

• Product: https://github.com/llvm/llvm-project/

CPE 2.3info

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Submitinfo

Accepted

• Submit #844457: LLVM LLVM Project commit 3b3a3c2 Stack-based Buffer Overflow (by TYGLS)

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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