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Tue, 15 Sep 2026 02:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | wasm2c Funcref Table Allocation Failure Enables Code Execution |
Mon, 14 Sep 2026 21:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | Wasm2c Sandbox Escape via Table Allocation Failure on 32‑bit Platforms | |
| Metrics |
ssvc
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Mon, 14 Sep 2026 06:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | Wasm2c Sandbox Escape via Table Allocation Failure on 32‑bit Platforms |
Sun, 13 Sep 2026 21:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | wasm2c Funcref Table Allocation Failure Enabling Sandbox Escape |
Sun, 13 Sep 2026 12:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | wasm2c Funcref Table Allocation Failure Enabling Sandbox Escape |
Sat, 12 Sep 2026 23:30:00 +0000
| Type | Values Removed | Values Added |
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| Description | wasm2c in WebAssembly wabt through 1.0.41 allows sandbox escape in some situations that primarily involve 32-bit platforms, aka a "table flip" attack. It does not check the return value of calloc() in wasm_rt_allocate_funcref_table() (wasm2c/wasm-rt-impl-tableops.inc). When the funcref table allocation fails, table->data is left NULL while table->size keeps the guest-declared element count; thus, bounds checks still pass and table element accesses resolve to absolute memory addresses (i * sizeof(wasm_rt_funcref_t)). This gives arbitrary read and write of host process memory and - via table.get, table.set, and call_indirect - arbitrary code execution, defeating the isolation that wasm2c exists to provide (a full sandbox escape). wasm2c is used as an in-process sandboxing boundary by RLBox and WasmBoxC, including in Firefox, which compiles the Graphite, Hunspell, Ogg, Expat, and Woff2 libraries via wasm2c to contain untrusted font, media, and XML input. Therefore, sandboxing in these applications is potentially affected. Exploitation requires the funcref table allocation to fail, for example under an address-space limit (RLIMIT_AS), on 32-bit hosts, with vm.overcommit_memory=2, or under memory pressure. On 64-bit Linux with default overcommit the allocation succeeds and the defect is not triggered. The wasm2c memory allocator aborts on calloc failure in the same runtime; the table allocator lacks this abort behavior. This was introduced in commit ab9e0b55 (PR #813). | |
| First Time appeared |
Webassembly
Webassembly wabt |
|
| Weaknesses | CWE-252 | |
| CPEs | cpe:2.3:a:webassembly:wabt:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Webassembly
Webassembly wabt |
|
| References |
| |
| Metrics |
cvssV4_0
|
Projects
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Status: PUBLISHED
Assigner: mitre
Published:
Updated: 2026-09-14T16:16:43.958Z
Reserved: 2026-09-12T23:16:33.768Z
Link: CVE-2026-90648
Updated: 2026-09-14T16:16:40.448Z
Status : Received
Published: 2026-09-13T00:17:07.023
Modified: 2026-09-14T17:17:55.827
Link: CVE-2026-90648
No data.
OpenCVE Enrichment
Updated: 2026-09-15T02:00:12Z