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.
Published: 2026-06-29
Score: 4.8 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

A vulnerability exists in the llvm‑project up to version 22.1.6 affecting the llvm::StringMap::insert function in ValueSymbolTable.cpp. Executing an insert with crafted data results in a stack-based buffer overflow (CWE‑119, CWE‑120, CWE‑121). Local execution is required, and a public exploit is available. The LLVM project notes that this behavior lies outside its documented security scope and is not officially considered a security vulnerability, leaving the true impact uncertain. A successful overflow could nevertheless cause local code execution or a crash.

Affected Systems

Vendors: llvm. Products: llvm-project (component ValueSymbolTable). Any installation of llvm-project earlier than or equal to release 22.1.6 is susceptible.

Risk and Exploitability

The CVSS score of 4.8 indicates moderate severity. The EPSS score of < 1% indicates a very low probability of exploitation, and the vulnerability is not listed in CISA's KEV catalog. Based on the description, it is inferred that the stack-based buffer overflow could result in local code execution or denial of service through crashes. Local access is required, but a publicly available exploit exists, making it a realistic threat for systems that allow local users to invoke the affected component. The LLVM project’s statement that the issue falls outside its documented security scope and is not officially classified as a security vulnerability may influence how the incident is handled.

Generated by OpenCVE AI on July 21, 2026 at 17:57 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the latest LLVM patch or upgrade to a version where the stack-based buffer overflow in ValueSymbolTable is fixed; this addresses CWE-119, CWE-120, and CWE-121.
  • If an immediate upgrade cannot be performed, perform strict input validation on any keys passed to llvm::StringMap::insert, ensuring they are within acceptable length limits and free of null bytes; this mitigates CWE-120 and provides bounds checking for CWE-119.
  • Restrict local access to the components that use ValueSymbolTable, run them under the least privileged user, and avoid exposing them to untrusted input that could trigger insert; this limits risk from potential local code execution (CWE-121).
  • Continuously monitor the application for abnormal crashes or memory corruption patterns, log exploit attempts, and apply any vendor security advisories as soon as they are released.

Generated by OpenCVE AI on July 21, 2026 at 17:57 UTC.

Tracking

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Advisories

No advisories yet.

History

Tue, 07 Jul 2026 15:00:00 +0000

Type Values Removed Values Added
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 project was informed of the problem early through an issue report but has not responded yet. 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.

Wed, 01 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-120
References
Metrics threat_severity

None

 threat_severity

Low

Mon, 29 Jun 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 29 Jun 2026 15:00:00 +0000

Type Values Removed Values Added
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 project was informed of the problem early through an issue report but has not responded yet.
Title llvm llvm-project ValueSymbolTable ValueSymbolTable.cpp insert stack-based overflow
First Time appeared Llvm
Llvm llvm-project
Weaknesses CWE-119
CWE-121
CPEs cpe:2.3:a:llvm:llvm-project:*:*:*:*:*:*:*:*
Vendors & Products Llvm
Llvm llvm-project
References
Metrics cvssV2_0

{'score': 1.7, 'vector': 'AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR'}

cvssV3_0

{'score': 3.3, 'vector': 'CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R'}

cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R'}

cvssV4_0

{'score': 4.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P'}

Subscriptions

Llvm Llvm-project
cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-07-07T14:32:21.212Z

Reserved: 2026-06-28T18:47:36.926Z

Link: CVE-2026-13573

cve-icon Vulnrichment

Updated: 2026-06-29T15:23:19.394Z

cve-icon NVD

No data.

cve-icon Redhat

Severity : Low

Publid Date: 2026-06-29T14:00:09Z

Links: CVE-2026-13573 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-07-21T18:00:04Z

Weaknesses
  • CWE-119

    Improper Restriction of Operations within the Bounds of a Memory Buffer

  • CWE-120

    Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

  • CWE-121

    Stack-based Buffer Overflow