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CVE-2026-69217

8.7 · HIGH

Http4s is a Scala interface for HTTP services.

Published Sep 15, 2026CWE-444EPSS 0.50%

Overview

CVE-2026-69217 is a high-severity vulnerability. It was published on September 15, 2026 and has a CVSS 3.1 base score of 8.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HTTP/1.1 parser accepts differing duplicate Content-Length headers and uses the last value instead of rejecting the message. When an Ember server is behind a keep-alive intermediary that selects a different occurrence, an unauthenticated attacker can create CL.CL request smuggling that bypasses front-end controls, captures a later user’s headers, or poisons a cache. The shared client parser can also misframe responses from a malicious or compromised upstream when the client acts as a proxy for multiple downstream consumers. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

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/http4s/http4s/commit/24e8d34e3ea89f8f23e0053ec9944f6467e8086dGitHubgithub.com/http4s/http4s/releases/tag/v0.23.35GitHubgithub.com/http4s/http4s/releases/tag/v1.0.0-M47GitHubgithub.com/http4s/http4s/security/advisories/GHSA-p83c-4wj9-p6w9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-69217?

CVE-2026-69217 is a high-severity vulnerability. It was published on September 15, 2026 and has a CVSS 3.1 base score of 8.7 (HIGH).

How severe is CVE-2026-69217?

This vulnerability has a CVSS 3.1 base score of 8.7, 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-2026-69217?

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-2026-69217?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-69217 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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