CVE-2026-0042
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedIn multiple functions of ubsan_throwing_runtime.cpp, there is a possible persistent denial of service due to resource exhaustion. This could lead to local denial of service with no additional execution privileges needed. User interaction is not needed for exploitation.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA resource exhaustion vulnerability exists in multiple functions within the UBSan (Undefined Behavior Sanitizer) throwing runtime library (ubsan_throwing_runtime.cpp). The issue allows a local attacker to cause a persistent denial of service by exhausting system resources without requiring any special privileges or user interaction.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 14.0= 15.0= 16.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Android OS versionRun 'getprop ro.build.version.release' in a terminal or check Settings > About Phone > Android versionAffected if The version is 14.0, 15.0, or 16.0
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Identify if UBSan is in useSearch for ubsan runtime libraries or binaries on the device: 'find / -name '*ubsan*' 2>/dev/null' or check application build configurations for -fsanitize=undefined flagAffected if UBSan runtime libraries (libubsan.so or similar) are present on the device or applications are built with UBSan enabled
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Check for ubsan_throwing_runtime componentInspect the UBSan installation: locate ubsan_throwing_runtime.cpp in the LLVM/Clang toolchain used to build the Android system or applicationsAffected if The ubsan_throwing_runtime.cpp file exists in the toolchain and is being used by compiled binaries
You are affected if you are running Android 14.0, 15.0, or 16.0 with UBSan (Undefined Behavior Sanitizer) enabled or built into your system or applications, as the vulnerable ubsan_throwing_runtime.cpp runtime is present and active.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUsers should update their LLVM/Clang toolchain to a version containing the fix for this vulnerability. Since this is a compiler runtime library issue, recompiling affected binaries with the patched toolchain is necessary.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-0042 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-0042 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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