Host memory corruption via omitted safepoint stack maps
Published Mar 31, 2022 · Updated Apr 23, 2025
Use after free in Bytecode Alliance Wasmtime 0.34.0, 0.34.1, 0.35.0, and 0.35.1 allows attackers to corrupt host memory. Cranelift emits cold blocks out of definition order but searches safepoints in definition order, omitting stack maps so garbage collection reclaims live externrefs that Wasm later uses. Exploitation requires a Wasm module that uses externrefs while the host has explicitly enabled epoch interruption, which is disabled by default; the resulting memory corruption affects the host process.
Summary
What happened
Use after free in Bytecode Alliance Wasmtime 0.34.0, 0.34.1, 0.35.0, and 0.35.1 allows attackers to corrupt host memory. Cranelift emits cold blocks out of definition order but searches safepoints in definition order, omitting stack maps so garbage collection reclaims live externrefs that Wasm later uses. Exploitation requires a Wasm module that uses externrefs while the host has explicitly enabled epoch interruption, which is disabled by default; the resulting memory corruption affects the host process.
The record
- CVE
- CVE-2022-24791
- Published
- Mar 31, 2022
- Updated
- Apr 23, 2025
- Vendor
- Bytecode Alliance
- Product
- Wasmtime
- Classifications
- CWE-416
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 31, 2022CVE publishedPublication date reported by the CVE source.
- Apr 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=< 0.34.2
- Affected versionversion=>= 0.35.0, < 0.35.2
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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