One-element out-of-bounds read via rounded negative fromIndex
Published Oct 16, 2025 · Updated Oct 16, 2025
Out-of-bounds read in QuickJS 2025-04-26 allows attackers to probe one adjacent element via a tiny negative fromIndex value. In js_typed_array_indexOf, floating-point addition can round the negative value plus the array length to exactly that length, so the search starts beyond the valid buffer. An embedding application must execute crafted JavaScript; repeated equality probes expose at most the single element immediately following the buffer.
Summary
What happened
Out-of-bounds read in QuickJS 2025-04-26 allows attackers to probe one adjacent element via a tiny negative fromIndex value. In js_typed_array_indexOf, floating-point addition can round the negative value plus the array length to exactly that length, so the search starts beyond the valid buffer. An embedding application must execute crafted JavaScript; repeated equality probes expose at most the single element immediately following the buffer.
The record
- CVE
- CVE-2025-62492
- Published
- Oct 16, 2025
- Updated
- Oct 16, 2025
- Vendor
- Fabrice Bellard
- Product
- QuickJS
- Classifications
- CWE-125, CAPEC-175
- Attack vector
- adjacent
- Privileges
- Unavailable
Timeline
How it unfolded
- Oct 16, 2025CVE publishedPublication date reported by the CVE source.
- Oct 16, 2025Record 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.
- Affected versionversion=2025-04-26 <2025-09-13
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Public exploit references
- Google Issue Tracker proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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