VulnSocial

CVE-2026-27572Disclosure(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 versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of the `wasi:http/types.fields` resource is susceptible to panics when too many fields are added to the set of headers. Wasmtime's implementation in the `wasmtime-wasi-http` crate is backed by a data structure which panics when it reaches excessive capacity and this condition was not handled gracefully in Wasmtime. Panicking in a WASI implementation is a Denial of Service vector for embedders and is treated as a security vulnerability in Wasmtime. Wasmtime 24.0.6, 36.0.6, 40.0.4, 41.0.4, and 42.0.0 patch this vulnerability and return a trap to the guest instead of panicking. There are no known workarounds at this time. Embedders are encouraged to update to a patched version of Wasmtime.

bytecodealliance CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Patch / fix
Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-770

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

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

  • wasmtime

Threat summary

  • 3 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • General: 1 classified signal
  • Peaked at 2 mentions on most recent observed day (2026-02-25)
  • 3 total mentions across 2 days

Affected systems

Vendors
bytecodealliance
Products
wasmtime

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-02-24: 1Mentions · 2026-02-25: 2Technical Details · 2026-02-24: 1Technical Details · 2026-02-25: 102-2402-25
Signal classification2 categories
Disclosure
266.7%
General
133.3%
Referenced assets3 URLs
Classification over time
DateTotalLabels
2026-02-241
Disclosure1
2026-02-252
Disclosure1General1
Full discourse3 posts
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-27572 Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of the `wasi:http/types.fields` resourc… https://www.cve.org/CVERecord?id=CVE-2026-27572 ----- Traducción: CVE-2026-27572 Was… http://infoflow.cloud`

    Post summary

    The post announces CVE-2026-27572 affecting Wasmtime, listing vulnerable versions and a link to the CVE record, but provides no exploit or mitigation details.

    0000033
    54 followersView on X
  • CVE@CVEnew
    General

    CVE-2026-27572 Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of the `wasi:http/types.fields` resourc… https://www.cve.org/CVERecord?id=CVE-2026-27572

    Post summary

    The text references CVE-2026-27572 and lists affected Wasmtime versions but provides no further details on the vulnerability, exploitation, or mitigation.

    00000156
    56.6K followersView on X
  • cvereports@_cvereports
    Disclosure

    CVE-2026-27572: CVE-2026-27572: When 32,769 Headers Kill the Sandbox A Denial of Service vulnerability in Wasmtime's wasi-http implementation allows a malicious guest module to crash the host runtime. By exploiting an internal limit in Rust's http cra... https://cvereports.com/reports/CVE-2026-27572

    Post summary

    A denial‑of‑service vulnerability in Wasmtime's wasi‑http implementation allows malicious guest modules to crash the host runtime by exploiting an internal limit in Rust's HTTP crate.

    0000039
    31 followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appbytecodealliancewasmtime-rust-

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