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Fencer Vulns
low 3.3

CVE-2026-13574 json

llvm llvm-project Bitcode File IntrinsicInst.cpp getBasePtr heap-based overflow

published 2026-06-29 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-40118

cvss
3.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

A vulnerability was determined in llvm llvm-project up to 22.1.6. This impacts the function GCRelocateInst::getBasePtr in the library llvm/lib/IR/IntrinsicInst.cpp of the component Bitcode File Handler. This manipulation causes heap-based buffer overflow. It is possible to launch the attack on the local host. The exploit has been publicly disclosed and may be utilized. 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.

Patch / fix

  • lld hummingbird 1 21.1.8-1.1.hum1
  • lldb hummingbird 1 21.1.8-1.1.hum1
  • llvm hummingbird 1 21.1.8-1.1.hum1
  • mlir hummingbird 1 21.1.8-1.1.hum1
  • clang hummingbird 1 21.1.8-1.1.hum1
  • polly hummingbird 1 21.1.8-1.1.hum1
  • libcxx hummingbird 1 21.1.8-1.1.hum1
  • libomp hummingbird 1 21.1.8-1.1.hum1

red hat advisories RHSA-2026:7634RHSA-2026:24069

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-13574 updated cvss 3.3

llvm: llvm-project: LLVM: Denial of service via heap-based buffer overflow in Bitcode File Handler

  • Red Hat Enterprise Linux 8 llvm, llvm-libs, llvm-test, llvm-googletest Red Hat Enterprise Linux 9 lld, lldb, llvm, clang, libomp, lld-libs, +14 more Red Hat Enterprise Linux 10 llvm Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9
    affected: no fix available “Fix deferred”
  • Red Hat Hardened Images lld 21.1.8-1.1.hum1, lld21 21.1.8-6.hum1, lldb 21.1.8-1.1.hum1, lldb21 21.1.8-6.hum1, llvm 21.1.8-1.1.hum1, llvm21 21.1.8-6.hum1, +39 more
    fixed: vendor fix RHSA-2026:7634
  • Red Hat AI Inference Server rhaii/vllm-cpu-rhel9, rhaii/vllm-tpu-rhel9, rhaii/vllm-cuda-rhel9, rhaii/vllm-rocm-rhel9, rhaiis/vllm-cpu-rhel9, rhaiis/vllm-tpu-rhel9, +9 more Red Hat Enterprise Linux AI (RHEL AI) 3 llvm14, llvm15, llvm20, llvm21 Red Hat Hardened Images rust 1.96.0-1.hum1 Red Hat OpenShift AI (RHOAI) rhoai/odh-automl-rhel9, rhoai/odh-autorag-rhel9, rhoai/odh-mlserver-rhel9, rhai/base-image-cpu-rhel9, rhai/base-image-tpu-rhel9, rhoai/odh-vllm-gaudi-rhel9, +40 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/llvm/llvm-project/issues/199191 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/user-attachments/files/28142619/poc.zip referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 4.8 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
CNA 3.1 3.3 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
CNA 3.0 3.3 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
CNA 2.0 1.7 AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR
CNA 4.0 1.9 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CNA 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CNA 2.0 1.7 AV:L/AC:L/Au:S/C:N/I:N/A:P

Affected products

  • llvm llvm-project

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

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