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CVE-2023-39326

5.3 · MEDIUM

A malicious HTTP sender can use chunk extensions to cause a receiver reading from a request or response body to read many more bytes from the network than are in the body.

Published Dec 6, 2023EPSS 1.21%

Overview

CVE-2023-39326 is a medium-severity vulnerability. It was published on December 6, 2023 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A malicious HTTP sender can use chunk extensions to cause a receiver reading from a request or response body to read many more bytes from the network than are in the body. A malicious HTTP client can further exploit this to cause a server to automatically read a large amount of data (up to about 1GiB) when a handler fails to read the entire body of a request. Chunk extensions are a little-used HTTP feature which permit including additional metadata in a request or response body sent using the chunked encoding. The net/http chunked encoding reader discards this metadata. A sender can exploit this by inserting a large metadata segment with each byte transferred. The chunk reader now produces an error if the ratio of real body to encoded bytes grows too small.

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

Refgo.dev/cl/547335Refgo.dev/issue/64433Refgroups.google.com/g/golang-dev/c/6ypN5EjibjM/m/KmLVYH_uAgAJReflists.fedoraproject.org/archives/list/[email protected]/message/UIU6HOGV6RRIKWM57LOXQA75BGZSIH6G/Refpkg.go.dev/vuln/GO-2023-2382Refgo.dev/cl/547335Refgo.dev/issue/64433Refgroups.google.com/g/golang-dev/c/6ypN5EjibjM/m/KmLVYH_uAgAJReflists.fedoraproject.org/archives/list/[email protected]/message/UIU6HOGV6RRIKWM57LOXQA75BGZSIH6G/Refpkg.go.dev/vuln/GO-2023-2382

How CyberStrike helps

Frequently asked questions

What is CVE-2023-39326?

CVE-2023-39326 is a medium-severity vulnerability. It was published on December 6, 2023 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2023-39326?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-39326?

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-2023-39326?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-39326 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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