CVE-2026-115889

criticalPriorität · verfolgen · 10EPSS 0.005 · 39. PerzentilExploit · PoCUS
grimoire priorityP1 · Urgent
Exploitable?
Public exploit
1 exploit · PoC
Likely / severe?
0.45% (39th) EPSS
CVSS 9.9 · critical
Is it mine?
3 products
Prüfe deine Angriffsfläche
Who says so?
1 sources
osv

EPSS · bewertet 2026-10-28

Wasmtime is a runtime for WebAssembly. Prior to 36.0.19 and 43.0.0, the Cranelift compiler backend bit-packs SSA value indices in a way that can silently overflow in release builds when compiling a sufficiently large or specially crafted Wasm function with many SSA values. The overflow can make Cranelift reference incorrect IR values, causing arbitrary miscompilation, type confusion, and other attacker-controlled effects that may escape the Wasm sandbox on any architecture using the default Cranelift backend. This issue is fixed in versions 36.0.19 and 43.0.0.

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cvss

Technischer Schweregrad, 0–10. Eine Zeile je Quelle.

9.9
010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen

v3.19.9criticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · security-advisories@github.comAusnutzbarkeit 3.1 · Auswirkung 6
v3.19.9criticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · OSV
v3.19.4criticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)
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SSVC

Eine Handlungsentscheidung — aus Ausnutzung und Auswirkung.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
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schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-197USCWE-197USCWE-843USCWE-843US
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Exploits (1)

Öffentlicher Proof-of-Concept- und Exploit-Code.

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betroffene Produkte (3)

Betroffene Produkte und Versionsbereiche.

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Advisories (2)

Hersteller- und Ökosystem-Meldungen dazu.

  • GHSA-897f-g5gm-fmxmWasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilation2026-10-23ghsa · osvUS

    ## Summary In Wasmtime prior to v43, the Cranelift compiler backend bit-packs its SSA value indices in a way that can result in silent overflow in release builds, and result in incorrect value references in the IR resulting in arbitrary miscompilation. A very large Wasm function body, or one that is specially crafted to use many SSA values, can use this to force type-confusion or other arbitrary side-effects and escape the sandbox. Cranelift was changed in Wasmtime v43 to use a full `u32` index, with checks if that limit is exceeded, and so is no longer susceptible to this bug. ## Impact A Wasmtime engine with default settings (using the Cranelift backend) on any architecture/platform could experience a sandbox escape from a specially-crafted Wasm module. ## Patches Wasmtime v36.0.19 has been released which fixes this issue.

  • RUSTSEC-2026-0380Bit-packing in Cranelift compiler causes silent overflow and miscompilation2026-10-19vendor · osvUS

    This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-897f-g5gm-fmxm For more information see the GitHub-hosted security advisory.

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auch bekannt als (2)

Weitere Namen und Kennungen dieser Entität.

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quellen

Welche Quellen diesen Datensatz belegen und wann.

osvNVDCVE.orgMITRE
veröffentlicht 2026-10-23geändert 2026-10-26
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Referenzen (7) nvd

Externe Belege — Patches, Meldungen, Analysen.

scry

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