CVE-2026-13574Public exploit

Local crash via unchecked gc.relocate index

Published Jun 29, 2026 · Updated Jun 29, 2026

Heap-buffer over-read in LLVM Project 22.1.0 through 22.1.6 allows local users to crash LLVM tools via crafted bitcode. GCRelocateInst::getBasePtr in llvm/lib/IR/IntrinsicInst.cpp adds an unchecked gc.relocate base index to an operand iterator and dereferences the resulting out-of-bounds llvm::Use. LLVM disputes security treatment because its tools are not hardened against malicious input; the demonstrated consequence is a process crash.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-buffer over-read in LLVM Project 22.1.0 through 22.1.6 allows local users to crash LLVM tools via crafted bitcode. GCRelocateInst::getBasePtr in llvm/lib/IR/IntrinsicInst.cpp adds an unchecked gc.relocate base index to an operand iterator and dereferences the resulting out-of-bounds llvm::Use. LLVM disputes security treatment because its tools are not hardened against malicious input; the demonstrated consequence is a process crash.

The record

CVE
CVE-2026-13574
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
LLVM
Product
LLVM Project
Classifications
CWE-122, T1203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=22.1.0
  2. Affected versionversion=22.1.1
  3. Affected versionversion=22.1.2
  4. Affected versionversion=22.1.3
  5. Affected versionversion=22.1.4
  6. Affected versionversion=22.1.5
  7. Affected versionversion=22.1.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

LLVM · LLVM Projectversion=22.1.0; version=22.1.1; version=22.1.2; version=22.1.3; version=22.1.4; version=22.1.5; version=22.1.6

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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