PHP 8.1-8.4 Lim. on HTTP Redirect Location Buffer (CVE-2025-1861)
CVE-2025-1861 Published on March 30, 2025
Stream HTTP wrapper truncates redirect location to 1024 bytes
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 parsing HTTP redirect in the response to an HTTP request, there is currently limit on the location value size caused by limited size of the location buffer to 1024. However as per RFC9110, the limit is recommended to be 8000. This may lead to incorrect URL truncation and redirecting to a wrong location.
Weakness Type
Incorrect Calculation of Buffer Size
The software does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.
Products Associated with CVE-2025-1861
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Affected Versions
PHP Group PHP:- Version 8.1.* and below 8.1.32 is affected.
- Version 8.2.* and below 8.2.28 is affected.
- Version 8.3.* and below 8.3.19 is affected.
- Version 8.4.* and below 8.4.5 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.