Stack-Based Buffer Overflow in LLVM Project's ValueSymbolTable Module
CVE-2026-13573

4.8MEDIUM

Key Information:

Vendor

Llvm

Status
Llvm-project
Vendor
CVE Published:
29 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-13573?

A vulnerability has been identified in the LLVM project's ValueSymbolTable module, specifically within the llvm::StringMap::insert function in /lib/IR/ValueSymbolTable.cpp. This vulnerability allows for a stack-based buffer overflow, which may lead to exploit scenarios if an attacker can execute code locally. The issue was publicly disclosed, yet the LLVM project has yet to address the reported problem, highlighting a potential risk for systems utilizing the affected versions of the llvm-project.

Affected Version(s)

llvm-project 22.1.0

llvm-project 22.1.1

llvm-project 22.1.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-13573 - Proof of Concept

References

https://vuldb.com/vuln/374581
vdb-entrytechnical-description
https://vuldb.com/vuln/374581/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-13573
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

TYGLS (VulDB User)
VulDB CNA Team
.