{"items":[{"id":"NVI-00009190","kind":"vulnerability","title":"Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-mghf-wjfp-p5xm","CVE-2026-115893"],"plain_summary":"GitHub lists this reviewed advisory for wasmtime, wasmtime, wasmtime. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-e9ec8ce54c2b40ae93bab7a462f5a7ba"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-28T21:14:15.000Z","value":"9.9 critical","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-e9ec8ce54c2b40ae93bab7a462f5a7ba"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-e9ec8ce54c2b40ae93bab7a462f5a7ba","url":"https://github.com/advisories/GHSA-mghf-wjfp-p5xm","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-mghf-wjfp-p5xm","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:56:08.420Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-e9ec8ce54c2b40ae93bab7a462f5a7ba"],"technology":"wasmtime","known_exclusions":[],"conditions_summary":"## Summary\n\nWhen running with the Cranelift compiler backend on an aarch64 target, Wasmtime can compile a Wasm module with more than ~256k targets on one `br_table` instruction in a way that results in an incorrect conditional branch target. This conditional branch could then jump to arbitrary other code (at an user-controlled offset), leading to arbitrary sandbox escapes.\n\n## Impact\n\nAny Wasmtime engine running on aarch64 with default settings can be forced to jump to arbitrary code by a user-controlled Wasm module. All versions of Wasmtime/Cranelift that support aarch64, since the initial release of that support in 2020 (before Wasmtime v1.0), are affected.\n\n## Patches\n\nWasmtime v36.0.19, v48.0.7, and v49.0.4 have been released which all fix this issue.","public_affected_ranges":["< 36.0.19"]},{"certainty":"source_listed","source_ids":["sr-e9ec8ce54c2b40ae93bab7a462f5a7ba"],"technology":"wasmtime","known_exclusions":[],"conditions_summary":"## Summary\n\nWhen running with the Cranelift compiler backend on an aarch64 target, Wasmtime can compile a Wasm module with more than ~256k targets on one `br_table` instruction in a way that results in an incorrect conditional branch target. This conditional branch could then jump to arbitrary other code (at an user-controlled offset), leading to arbitrary sandbox escapes.\n\n## Impact\n\nAny Wasmtime engine running on aarch64 with default settings can be forced to jump to arbitrary code by a user-controlled Wasm module. All versions of Wasmtime/Cranelift that support aarch64, since the initial release of that support in 2020 (before Wasmtime v1.0), are affected.\n\n## Patches\n\nWasmtime v36.0.19, v48.0.7, and v49.0.4 have been released which all fix this issue.","public_affected_ranges":[">= 37.0.0, < 48.0.7"]},{"certainty":"source_listed","source_ids":["sr-e9ec8ce54c2b40ae93bab7a462f5a7ba"],"technology":"wasmtime","known_exclusions":[],"conditions_summary":"## Summary\n\nWhen running with the Cranelift compiler backend on an aarch64 target, Wasmtime can compile a Wasm module with more than ~256k targets on one `br_table` instruction in a way that results in an incorrect conditional branch target. This conditional branch could then jump to arbitrary other code (at an user-controlled offset), leading to arbitrary sandbox escapes.\n\n## Impact\n\nAny Wasmtime engine running on aarch64 with default settings can be forced to jump to arbitrary code by a user-controlled Wasm module. All versions of Wasmtime/Cranelift that support aarch64, since the initial release of that support in 2020 (before Wasmtime v1.0), are affected.\n\n## Patches\n\nWasmtime v36.0.19, v48.0.7, and v49.0.4 have been released which all fix this issue.","public_affected_ranges":[">= 49.0.0, < 49.0.4"]}],"null_published_at":"2026-10-31T22:13:31.289Z","source_updated_at":"2026-10-28T21:14:15.000Z","source_disclosed_at":"2026-10-28T21:14:14.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:56:08.420Z"}],"next_cursor":null,"snapshot_revision":"42594"}