VDB
CVE-2026-115892
CVE-2026-115892
PUBLISHED
CVSS 5.7 MEDIUM
Reported by GitHub_M · Published October 23, 2026
Wasmtime is a runtime for WebAssembly. From 46.0.0 until 48.0.7 and 49.0.4, lowering a host-created component-model stream or future into a guest can omit a required payload-type check after the value passes through guest code and returns through StreamAny, FutureAny, Val::Stream, Val::Future, or an equivalent typed reader. A malicious guest that controls exported function types or returned values can cause the host to pass the type-erased value to a guest expecting a different payload type, which panics the Wasmtime host. This issue is fixed in versions 48.0.7 and 49.0.4.
Risk Scores
CVSS 4.0
5.7
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| bytecodealliance | wasmtime | >= 46.0.0, < 48.0.7, >= 49.0.0, < 49.0.4 |
| chainguard | yara-x | 0 |
| wolfi | yara-x | 0 |
| wolfi | zed | 0 |
| bytecodealliance | wasmtime | 46.0.0, 49.0.0 |
| chainguard | zed | 0 |
| chainguard | wasmcloud | 0 |
| crates.io | wasmtime | 46.0.0, 49.0.0 |
Timeline
- Oct 19, 2026 CVE Published
- Oct 23, 2026 CVE Updated
- Oct 24, 2026 EPSS Score
- Oct 24, 2026 Coalition ESS Score
- Oct 25, 2026 EPSS Score
- Oct 29, 2026 EPSS Score
- Oct 30, 2026 Security Advisory
References
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-9pvw-hwfg-92h5 x_refsource_CONFIRM
- https://github.com/bytecodealliance/wasmtime/pull/14819 x_refsource_MISC
- https://github.com/bytecodealliance/wasmtime/pull/14820 x_refsource_MISC
- https://github.com/bytecodealliance/wasmtime/pull/14827 x_refsource_MISC
- https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd x_refsource_MISC
- https://github.com/bytecodealliance/wasmtime/commit/48dacc76241f06088e79f3ce1b17642f2f7bf158 x_refsource_MISC
- https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618 x_refsource_MISC
- https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7 x_refsource_MISC
- https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-115892 advisory
- https://github.com/advisories/GHSA-9pvw-hwfg-92h5 advisory
- https://rustsec.org/advisories/RUSTSEC-2026-0378.html url