Is CVE-2026-66752 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-66752 being exploited in the wild.

How severe is CVE-2026-66752?

High severity, with a CVSS score of 7.2, published 28 July 2026.

Is there a fix for CVE-2026-66752?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-66752 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-66752?

Check whether you run Tiny-Http at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-66752: tiny-http HTTP request smuggling via Transfer-Encoding handling

CVE-2026-66752 · Severity: high · CVSS 7.2 · Published 2026-07-28

tiny-http is a lightweight library used to build web servers. A security flaw in how it handles web requests allows an attacker to interfere with the communication between a front-end proxy and the back-end server. This can lead to unauthorized access to data, the bypassing of security controls, or a denial-of-service condition where the server becomes unresponsive to legitimate users.

Technologies: Tiny-Http. Vendors: Tiny-Http.

Quick answers

Is CVE-2026-66752 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-66752 being exploited in the wild.
How severe is CVE-2026-66752?: High severity, with a CVSS score of 7.2, published 28 July 2026.
Which products and versions are affected?: Tiny-Http <= 0.12.0.
Is there a fix for CVE-2026-66752?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-66752 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-66752?: Check whether you run Tiny-Http at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An HTTP request smuggling vulnerability (CWE-444) exists in tiny-http through version 0.12.0. The library incorrectly handles the Transfer-Encoding header by unconditionally applying chunk-decoding and discarding the Content-Length header whenever Transfer-Encoding is present, regardless of its value. An attacker can exploit this behavior to desynchronize the request stream between a front-end proxy and the tiny-http server. This can be used to smuggle malicious requests or cause a denial-of-service by tying up worker threads with failed body reads. The vulnerability is exploitable over the network without authentication.

Affected products

tiny-http tiny-http <= 0.12.0

Timeline

2026-07-28: advisory: NVD publication date
2026-07-28: disclosed: Researcher disclosure by Theodosis Paidakis

References

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