Is CVE-2026-27572 actively exploited?

CVE-2026-27572 has no public evidence of in-the-wild exploitation as of 2026-02-25.

What is the CVSS score for CVE-2026-27572?

CVE-2026-27572 has a CVSS score of 6.9 (MEDIUM severity). Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

How do I patch CVE-2026-27572?

Patch guidance is available from bytecodealliance security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-27572.

CVE-2026-27572 - remediation guidance & executive summary

Q: Which products are affected by CVE-2026-27572?

4 products: bytecodealliance wasmtime, bytecodealliance wasmtime, bytecodealliance wasmtime, bytecodealliance wasmtime.

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.

CVSS Metrics

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector: network
Complexity: low
Privileges: low
User Action: passive
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-770

Metadata

Primary Vendor: BYTECODEALLIANCE
Published: 2/24/2026
Last Modified: 2/25/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

bytecodealliance : wasmtimebytecodealliance : wasmtimebytecodealliance : wasmtimebytecodealliance : wasmtime

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-27572. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-27572

View on NIST NVD

CVE-2026-27572 vulnerability