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Fencer Vulns
low 3.3

CVE-2026-13573 json

llvm llvm-project ValueSymbolTable ValueSymbolTable.cpp insert stack-based overflow

published 2026-06-29 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-40115

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 6%
public exploits
0
none known

Summary

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.

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-2026-13573 updated cvss 3.3

llvm: llvm: Denial of Service via stack-based buffer overflow in StringMap::insert

  • 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 8 llvm, clang, llvm-libs, llvm-test, clang-libs, python3-clang, +5 more Red Hat Enterprise Linux 9 lld, lldb, llvm, clang, libomp, lld-libs, +14 more Red Hat Enterprise Linux 10 llvm Red Hat Enterprise Linux AI (RHEL AI) 3 llvm14, llvm15, llvm20, llvm21, rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, +5 more 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
    +2 more products
    Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, 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 Hardened Images rust 1.96.0-1.hum1
    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

0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/user-attachments/files/28141697/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-121 Stack-based Buffer Overflow
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.