CVE-2026-43644 podinfo 6.11.2 Reflected XSS via /echo Endpoint

What is CVE-2026-43644?

CVE-2026-43644 is a medium-severity cross-site scripting vulnerability in stefanprodan podinfo, published on 14 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

podinfo through 6.11.2 contains a reflected cross-site scripting vulnerability in the /echo and /api/echo endpoints where the echoHandler writes request body content directly to the response without setting explicit Content-Type or X-Content-Type-Options headers. Attackers can craft cross-origin HTML pages with auto-submitting forms containing script payloads in the request body, which are served as text/html due to Go's content type detection, allowing the reflected script to execute in the podinfo origin context when victims visit the attacker's page.

Weakness: CWE-79

Which versions are affected by CVE-2026-43644?

3 open source packages ship an affected version, including github.com/stefanprodan/podinfo. It affects 1 product.

Products include Stefanprodan Podinfo.

How do I fix CVE-2026-43644?

Upgrade github.com/stefanprodan/podinfo to 1.8.1-0.20260519111337-cbebb20fd485 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-43644 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-43644 exists.

Other vulnerabilities in stefanprodan podinfo

• CVE-2025-70849 Podinfo affected by Arbitrary File Upload that leads to Stored Cross-Site Scripting (XSS) Medium 6.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-q23m-vm9r-5745, GO-2026-5560.