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CVE-2026-27700

8.2 · HIGH

Hono is a Web application framework that provides support for any JavaScript runtime.

Published Feb 25, 2026CWE-290EPSS 0.35%

Overview

CVE-2026-27700 is a high-severity vulnerability. It was published on February 25, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Hono is a Web application framework that provides support for any JavaScript runtime. In versions 4.12.0 and 4.12.1, when using the AWS Lambda adapter (`hono/aws-lambda`) behind an Application Load Balancer (ALB), the `getConnInfo()` function incorrectly selected the first value from the `X-Forwarded-For` header. Because AWS ALB appends the real client IP address to the end of the `X-Forwarded-For` header, the first value can be attacker-controlled. This could allow IP-based access control mechanisms (such as the `ipRestriction` middleware) to be bypassed. Version 4.12.2 patches the issue.

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

GitHubgithub.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7GitHubgithub.com/honojs/hono/releases/tag/v4.12.2GitHubgithub.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-27700?

CVE-2026-27700 is a high-severity vulnerability. It was published on February 25, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-27700?

This vulnerability has a CVSS 3.1 base score of 8.2, 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-2026-27700?

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-2026-27700?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-27700 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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