VulnSocial

CVE-2026-34943Disclosure(bytecodealliance / wasmtime)

LOWCVSS 7.5 · HIGH

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. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime contains a possible panic which can happen when a flags-typed component model value is lifted with the Val type. If bits are set outside of the set of flags the component model specifies that these bits should be ignored but Wasmtime will panic when this value is lifted. This panic only affects wasmtime's implementation of lifting into Val, not when using the flags! macro. This additionally only affects flags-typed values which are part of a WIT interface. This has the risk of being a guest-controlled panic within the host which Wasmtime considers a DoS vector. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1.

bytecodealliance CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-248

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

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-2026-34943 Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime contains a possible panic which can happen when a flags-typed component m… https://www.cve.org/CVERecord?id=CVE-2026-34943 ----- Traducción: CVE-2026-34943 Was… http://infoflow.cloud`

    Post summary

    The post announces CVE-2026-34943 for Wasmtime, noting a potential panic in specific versions and links to the official CVE record.

    0000033
    67 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-34943 Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime contains a possible panic which can happen when a flags-typed component m… https://www.cve.org/CVERecord?id=CVE-2026-34943

    Post summary

    The post announces CVE-2026-34943, noting a possible panic in certain Wasmtime releases, but provides no PoC, exploit, or mitigation details.

    00000132
    57.0K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appbytecodealliancewasmtime-rust-

Explore more

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