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CVE-2026-27572

7.5 · HIGH

Wasmtime is a runtime for WebAssembly.

Published Feb 24, 2026CWE-770EPSS 0.68%

Overview

CVE-2026-27572 is a high-severity vulnerability. It was published on February 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refdocs.rs/http/1.4.0/http/header/#limitationsGitHubgithub.com/bytecodealliance/wasmtime/commit/301dc7162cca51def19131019af1187f45901c0aGitHubgithub.com/bytecodealliance/wasmtime/releases/tag/v24.0.6GitHubgithub.com/bytecodealliance/wasmtime/releases/tag/v36.0.6GitHubgithub.com/bytecodealliance/wasmtime/releases/tag/v40.0.4GitHubgithub.com/bytecodealliance/wasmtime/releases/tag/v41.0.4GitHubgithub.com/bytecodealliance/wasmtime/security/advisories/GHSA-243v-98vx-264h

How CyberStrike helps

Frequently asked questions

What is CVE-2026-27572?

CVE-2026-27572 is a high-severity vulnerability. It was published on February 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-27572?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-27572?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-27572?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-27572 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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