What is GHSA-9JXR-MWPP-W643?

GHSA-9JXR-MWPP-W643 is a medium-severity security vulnerability in httpsoft/http-message (composer), affecting versions < 1.0.12. It is fixed in 1.0.12.

How severe is GHSA-9JXR-MWPP-W643?

GHSA-9JXR-MWPP-W643 has a CVSS score of 5.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Which versions of httpsoft/http-message are affected by GHSA-9JXR-MWPP-W643?

httpsoft/http-message (composer) versions < 1.0.12 is affected.

Is there a fix for GHSA-9JXR-MWPP-W643?

Yes. GHSA-9JXR-MWPP-W643 is fixed in 1.0.12. Upgrade to this version or later.

Is GHSA-9JXR-MWPP-W643 exploitable, and should I be worried?

Whether GHSA-9JXR-MWPP-W643 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.

What actually determines whether GHSA-9JXR-MWPP-W643 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-9JXR-MWPP-W643?

Upgrade httpsoft/http-message to 1.0.12 or later.

GHSA-9JXR-MWPP-W643 in httpsoft/http-message

Q: How severe is GHSA-9JXR-MWPP-W643?

GHSA-9JXR-MWPP-W643 has a CVSS score of 5.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Q: Which versions of httpsoft/http-message are affected by GHSA-9JXR-MWPP-W643?

httpsoft/http-message (composer) versions < 1.0.12 is affected.

Q: Is there a fix for GHSA-9JXR-MWPP-W643?

Yes. GHSA-9JXR-MWPP-W643 is fixed in 1.0.12. Upgrade to this version or later.

Q: Is GHSA-9JXR-MWPP-W643 exploitable, and should I be worried?

Whether GHSA-9JXR-MWPP-W643 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.

Q: What actually determines whether GHSA-9JXR-MWPP-W643 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.

Q: How do I fix GHSA-9JXR-MWPP-W643?

Upgrade httpsoft/http-message to 1.0.12 or later.

Summary

Improper header validation in httpsoft/http-message

Workarounds

There are no known workarounds.

References

https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4

Impact

Improper header parsing. An attacker could sneak in a newline (\n) into both the header names and values. While the specification states that \r\n\r\n is used to terminate the header list, many servers in the wild will also accept \n\n.

GHSA-9JXR-MWPP-W643 has a CVSS score of 5.3 (Medium). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (1.0.12); upgrading removes the vulnerable code path.

Affected versions

httpsoft/http-message (< 1.0.12)

Security releases

httpsoft/http-message → 1.0.12 (composer)

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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Remediation advice

The issue is patched in 1.0.12.

Frequently Asked Questions

What is GHSA-9JXR-MWPP-W643? GHSA-9JXR-MWPP-W643 is a medium-severity security vulnerability in httpsoft/http-message (composer), affecting versions < 1.0.12. It is fixed in 1.0.12.
How severe is GHSA-9JXR-MWPP-W643? GHSA-9JXR-MWPP-W643 has a CVSS score of 5.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
Which versions of httpsoft/http-message are affected by GHSA-9JXR-MWPP-W643? httpsoft/http-message (composer) versions < 1.0.12 is affected.
Is there a fix for GHSA-9JXR-MWPP-W643? Yes. GHSA-9JXR-MWPP-W643 is fixed in 1.0.12. Upgrade to this version or later.
Is GHSA-9JXR-MWPP-W643 exploitable, and should I be worried? Whether GHSA-9JXR-MWPP-W643 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-9JXR-MWPP-W643 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-9JXR-MWPP-W643? Upgrade httpsoft/http-message to 1.0.12 or later.