Buffer overflow in Llvm Llvm-Project
CVE-2026-13573
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (6.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 6.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Llvm Llvm-Project — versions 22.1.0, 22.1.1, 22.1.2
Weakness classification (CWE)
References
- vuldb.com/vuln/374581 (technical-description, vdb-entry)
- vuldb.com/vuln/374581/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-13573 (third-party-advisory)
- vuldb.com/submit/844457 (third-party-advisory)
- github.com/llvm/llvm-project/issues/199187 (issue-tracking)
- github.com/user-attachments/files/28141697/poc.zip (exploit, broken-link)
- github.com/llvm/llvm-project/ (product)
Frequently asked questions
- What is CVE-2026-13573?
- CVE-2026-13573 is a low-severity vulnerability in Llvm Llvm-Project, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 3.3/10. Published 2026-06-29.
- How severe is CVE-2026-13573?
- Low severity. CVSS v3 base score is 3.3 out of 10.