Parser crash via freed-memory read in GetFuncOffset
Published Jun 19, 2025 · Updated Jun 23, 2025
Use-after-free in GetFuncOffset in WebAssembly WABT 1.0.37 and earlier allows local users to crash the parser with crafted Wasm. A malformed binary drives OnReturnCallExpr into GetFuncOffset, which performs a four-byte read from memory already freed during error handling. Reachability requires local processing of the crafted file; the demonstrated consequence is process abort, and Debian classifies the CLI crash as having no security impact.
Summary
What happened
Use-after-free in GetFuncOffset in WebAssembly WABT 1.0.37 and earlier allows local users to crash the parser with crafted Wasm. A malformed binary drives OnReturnCallExpr into GetFuncOffset, which performs a four-byte read from memory already freed during error handling. Reachability requires local processing of the crafted file; the demonstrated consequence is process abort, and Debian classifies the CLI crash as having no security impact.
The record
- CVE
- CVE-2025-6275
- Published
- Jun 19, 2025
- Updated
- Jun 23, 2025
- Vendor
- WebAssembly
- Product
- WABT
- Classifications
- CWE-416, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 19, 2025CVE publishedPublication date reported by the CVE source.
- Jun 23, 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=1.0.0
- Affected versionversion=1.0.1
- Affected versionversion=1.0.10
- Affected versionversion=1.0.11
- Affected versionversion=1.0.12
- Affected versionversion=1.0.13
- Affected versionversion=1.0.14
- Affected versionversion=1.0.15
- Affected versionversion=1.0.16
- Affected versionversion=1.0.17
- Affected versionversion=1.0.18
- Affected versionversion=1.0.19
- Affected versionversion=1.0.2
- Affected versionversion=1.0.20
- Affected versionversion=1.0.21
- Affected versionversion=1.0.22
- Affected versionversion=1.0.23
- Affected versionversion=1.0.24
- Affected versionversion=1.0.25
- Affected versionversion=1.0.26
- Affected versionversion=1.0.27
- Affected versionversion=1.0.28
- Affected versionversion=1.0.29
- Affected versionversion=1.0.3
- Affected versionversion=1.0.30
- Affected versionversion=1.0.31
- Affected versionversion=1.0.32
- Affected versionversion=1.0.33
- Affected versionversion=1.0.34
- Affected versionversion=1.0.35
- Affected versionversion=1.0.36
- Affected versionversion=1.0.37
- Affected versionversion=1.0.4
- Affected versionversion=1.0.5
- Affected versionversion=1.0.6
- Affected versionversion=1.0.7
- Affected versionversion=1.0.8
- Affected versionversion=1.0.9
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.
Weakness, pattern, technique
Public exploit references
- wabt_crash_5.txt proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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