GHSA-88xq-w8cq-xfg7 · 深刻度： medium · エコシステム： rust — Invalid drop of partially-initialized instances in the pooling instance allocator for modules with defined `externref` globals
Wasmtime is an open source runtime for WebAssembly & WASI. Prior to versions 0.34.1 and 0.33.1, there exists a bug in the pooling instance allocator in Wasmtime's runtime where a failure to instantiate an instance for a module that defines an `externref` global will result in an invalid drop of a `VMExternRef` via an uninitialized pointer. A number of conditions listed in the GitHub Security Advisory must be true in order for an instance to be vulnerable to this issue. Maintainers believe that the effective impact of this bug is relatively small because the usage of `externref` is still uncommon and without a resource limiter configured on the `Store`, which is not the default configuration, it is only possible to trigger the bug from an error returned by `mprotect` or `VirtualAlloc`. Note that on Linux with the `uffd` feature enabled, it is only possible to trigger the bug from a resource limiter as the call to `mprotect` is skipped. The bug has been fixed in 0.34.1 and 0.33.1 and users are encouraged to upgrade as soon as possible. If it is not possible to upgrade to version 0.34.1 or 0.33.1 of the `wasmtime` crate, it is recommend that support for the reference types proposal be disabled by passing `false` to `Config::wasm_reference_types`. Doing so will prevent modules that use `externref` from being loaded entirely.
総合評価: CVE-2022-23636 は低リスク（38.1/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.76%、50 パーセンタイル） 推奨対応: 悪用情報と EPSS の推移を監視し、必要に応じて優先度を見直してください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-17 | 0.74% | 0.76% | +0.02% |
| 2 | 2026-06-15 | 0.30% | 0.74% | +0.44% |
| 3 | 2026-06-10 | — | 0.30% | — |
EPSS の全履歴 （全 9 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 5.1 | 3.1 | MEDIUM |
|
1.4 | 3.6 | [email protected] |
| 8.1 | 3.1 | HIGH |
|
2.2 | 5.9 | [email protected] |
| 7.1 | 2.0 | HIGH |
|
8.6 | 6.9 | [email protected] |
GHSA-88xq-w8cq-xfg7 · 深刻度： medium · エコシステム： rust — Invalid drop of partially-initialized instances in the pooling instance allocator for modules with defined `externref` globals
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2022-23636 unimportant priority: Debian including 1 source packages (rust-wasmtime), 3 status rows across 3 suites (forky, sid, trixie): resolved 3. | https://security-tracker.debian.org/tracker/CVE-2022-23636 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| bytecodealliance | wasmtime | < 0.33.1 | cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:* |
| bytecodealliance | wasmtime | 0.34.0 | cpe:2.3:a:bytecodealliance:wasmtime:0.34.0:*:*:*:*:rust:*:* |
| URL | タグ |
|---|---|
| https://github.com/bytecodealliance/wasmtime/commit/886ecc562040bef61faf19438c22285c2d62403a | Patch Third Party Advisory |
| https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-88xq-w8cq-xfg7 | Mitigation Third Party Advisory |