Heap-Based Buffer Overflow in LLVM Project's Bitcode File Handler
CVE-2026-13574

4.8MEDIUM

Key Information:

Vendor

Llvm

Status
Llvm-project
Vendor
CVE Published:
29 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-13574?

A vulnerability exists in the LLVM llvm-project affecting the Bitcode File Handler, specifically within the GCRelocateInst::getBasePtr function. This issue allows for heap-based buffer overflow, potentially enabling local attackers to exploit the flaw. Despite early reports of the issue to the project maintainers, no resolution has been provided. Exploitation may pose serious risks if left unaddressed, as it allows manipulation of memory, which could lead to unauthorized access or system compromise.

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-2026-13574 - Proof of Concept

References

https://vuldb.com/vuln/374582
vdb-entrytechnical-description
https://vuldb.com/vuln/374582/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-13574
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
.