Summary
URL Rewrite vulnerability in multiple zendframework components
zend-diactoros (and, by extension, Expressive), zend-http (and, by extension, Zend Framework MVC projects), and zend-feed (specifically, its PubSubHubbub sub-component) each contain a potential URL rewrite exploit. In each case, marshaling a request URI includes logic that introspects HTTP request headers that are specific to a given server-side URL rewrite mechanism.
When these headers are present on systems not running the specific URL rewriting mechanism, the logic would still trigger, allowing a malicious client or proxy to emulate the headers to request arbitrary content.
Impact
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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zendframework/zend-diactoros to 1.8.4 or later; zendframework/zend-feed to 2.10.3 or later; zendframework/zend-http to 2.8.1 or later
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is GHSA-F6P5-76FP-M248? GHSA-F6P5-76FP-M248 is a high-severity security vulnerability in zendframework/zend-diactoros (composer), affecting versions < 1.8.4. It is fixed in 1.8.4, 2.10.3, 2.8.1.
- Which packages are affected by GHSA-F6P5-76FP-M248?
zendframework/zend-diactoros(composer) (versions < 1.8.4)zendframework/zend-feed(composer) (versions < 2.10.3)zendframework/zend-http(composer) (versions < 2.8.1)
- Is there a fix for GHSA-F6P5-76FP-M248? Yes. GHSA-F6P5-76FP-M248 is fixed in 1.8.4, 2.10.3, 2.8.1. Upgrade to this version or later.
- Is GHSA-F6P5-76FP-M248 exploitable, and should I be worried? Whether GHSA-F6P5-76FP-M248 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-F6P5-76FP-M248 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix GHSA-F6P5-76FP-M248?
- Upgrade
zendframework/zend-diactorosto 1.8.4 or later - Upgrade
zendframework/zend-feedto 2.10.3 or later - Upgrade
zendframework/zend-httpto 2.8.1 or later
- Upgrade