CVE-2025-1734

Streams HTTP wrapper does not fail for headers with invalid name and no colon

Description

In PHP from 8.1.* before 8.1.32, from 8.2.* before 8.2.28, from 8.3.* before 8.3.19, from 8.4.* before 8.4.5, when receiving headers from HTTP server, the headers missing a colon (:) are treated as valid headers even though they are not. This may confuse applications into accepting invalid headers.

Category

6.3
CVSS
Severity: Medium
CVSS 4.0 •
CVSS 3.1 •
EPSS 0.14%
Vendor Advisory github.com
Affected: PHP Group PHP
Published at:
Updated at:

References

Link Tags
https://github.com/php/php-src/security/advisories/GHSA-pcmh-g36c-qc44 vendor advisory
https://security.netapp.com/advisory/ntap-20250523-0009/ third party advisory

Frequently Asked Questions

What is the severity of CVE-2025-1734?
CVE-2025-1734 has been scored as a medium severity vulnerability.
How to fix CVE-2025-1734?
To fix CVE-2025-1734, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-1734 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-1734 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-1734?
CVE-2025-1734 affects PHP Group PHP.
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