VulnSocial

CVE-2026-34983Disclosure(bytecodealliance / wasmtime)

LOWCVSS 5.0 · MEDIUM

Signal is active with 2 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Wasmtime is a runtime for WebAssembly. In 43.0.0, cloning a wasmtime::Linker is unsound and can result in use-after-free bugs. This bug is not controllable by guest Wasm programs. It can only be triggered by a specific sequence of embedder API calls made by the host. Specifically, the following steps must occur to trigger the bug clone a wasmtime::Linker, drop the original linker instance, use the new, cloned linker instance, resulting in a use-after-free. This vulnerability is fixed in 43.0.1.

bytecodealliance CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-416

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • wasmtime

Threat summary

  • 2 mentions across 1 observed day

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • 2 total mentions across 1 day

Affected systems

Vendors
bytecodealliance
Products
wasmtime

1 version affected across 1 product

Deep dive

Activity timeline2 mentions / 1d
01122Mentions · 2026-04-09: 2Technical Details · 2026-04-09: 204-09
Signal classification1 categories
Disclosure
2100.0%
Referenced assets2 URLs
By indicator
Full discourse2 posts
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-34983 Wasmtime is a runtime for WebAssembly. In 43.0.0, cloning a wasmtime::Linker is unsound and can result in use-after-free bugs. This bug is not controllable by guest W… https://www.cve.org/CVERecord?id=CVE-2026-34983 ----- Traducción: CVE-2026-34983 Was… http://infoflow.cloud`

    Post summary

    A new CVE (CVE-2026-34983) in Wasmtime was disclosed, highlighting a use‑after‑free risk from unsound cloning; no PoC, exploit, or patch information is yet available.

    0000042
    67 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-34983 Wasmtime is a runtime for WebAssembly. In 43.0.0, cloning a wasmtime::Linker is unsound and can result in use-after-free bugs. This bug is not controllable by guest W… https://www.cve.org/CVERecord?id=CVE-2026-34983

    Post summary

    The post announces a use‑after‑free flaw in Wasmtime’s Linker cloning for version 43.0.0, providing technical details but no PoC, exploit code, active exploits, or patch information.

    00000124
    57.0K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appbytecodealliancewasmtime43.0.0rust-

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