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CVE-2026-11856

9.8 · CRITICAL

Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusi…

Published Jul 3, 2026CWE-294EPSS 0.69%

Overview

CVE-2026-11856 is a critical-severity vulnerability. It was published on July 3, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Successfully using libcurl to do a transfer to a specific HTTP origin

(`hostA`) with **Digest** authentication and then changing the origin to a

different one (`hostB`) for a second transfer, reusing the same handle, makes

libcurl wrongly pass on the `Authorization:` header field meant for `hostA`,

to `hostB`.

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

Refcurl.se/docs/CVE-2026-11856.htmlRefcurl.se/docs/CVE-2026-11856.jsonRefhackerone.com/reports/3793260Refhackerone.com/reports/3793260

How CyberStrike helps

Frequently asked questions

What is CVE-2026-11856?

CVE-2026-11856 is a critical-severity vulnerability. It was published on July 3, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-11856?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-11856?

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-2026-11856?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-11856 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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