Wasmtime 49.0.0 before 49.0.3 Host Panic via Overlapping String Transcode in Fused Adapter
Impact
Wasmtime versions 49.0.0 before 49.0.3 have a host panic vulnerability via overlapping string transcode in the fused adapter, which may be triggered by a reachable assertion weakness. The vulnerability requires local access. The impact is a host panic.
Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.Affected packages
Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.
| Affected range | Recorded fix |
|---|---|
| From 49.0.0 before 49.0.3Semantic versions | 49.0.3 |
Version evidence: OSV · RUSTSEC-2026-0360
View original version evidence (0 explicit versions)
Affected products
Vendor version evidence. Product records are separate from automatic dependency matching.
bytecodealliance · VulnCheck
wasmtime
2 ranges
bytecodealliance · VulnCheck
wasmtime
Package identity
pkg:cargo/wasmtimeExplore wasmtime →Identity supplied by VulnCheck. Version matching requires compatible range evidence.
Compare with this publisher’s ranges. This does not inspect your installation.
affected
49.0.0 → before 49.0.3
semver versions
unaffected
49.0.3
semver versions
Other versions: unaffected
Original source description
This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-54p9-vhhq-8f7q For more information see the GitHub-hosted security advisory.
Inside the record
Evidence available
Describes the evidence in this view, not whether the product is safe.
Original records
CVE-2026-119132View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.
cve.new JSON →Underlying weaknesses
The source’s classification of what caused the vulnerability.
Environment requirements
These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.
VulnCheck · platform conditions
Any condition may hold
Vulnerable product
cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*From (inclusive): 49.0.0
Before: 49.0.3
Original applicability statements
[
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*",
"versionStartIncluding": "49.0.0",
"versionEndExcluding": "49.0.3"
}
]
}
]
}
]Contributing organizations · 1
Assigning organization
What changed
Follow changesLarge field values are marked as truncated previews. Original source snapshots remain retained.