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HIGH

CVE-2025-14177

CVSS v3

7.5

HIGH

EPSS Score

0.5 %

exploit probability, as of 2026-10-07

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

In PHP versions:8.1.* before 8.1.34, 8.2.* before 8.2.30, 8.3.* before 8.3.29, 8.4.* before 8.4.16, 8.5.* before 8.5.1, the getimagesize() function may leak uninitialized heap memory into the APPn segments (e.g., APP1) when reading images in multi-chunk mode (such as via php://filter). This occurs due to a bug in php_read_stream_all_chunks() that overwrites the buffer without advancing the pointer, leaving tail bytes uninitialized. This may lead to information disclosure of sensitive heap data and affect the confidentiality of the target server.

Technical details

Published
2025-12-27

Frequently asked questions

What is CVE-2025-14177?

In PHP versions:8.1.* before 8.1.34, 8.2.* before 8.2.30, 8.3.* before 8.3.29, 8.4.* before 8.4.16, 8.5.* before 8.5.1, the getimagesize() function may leak uninitialized heap memory into the APPn segments (e.g., APP1) when reading images in multi-chunk mode (such as via php://filter). This occurs due to a bug in php_read_stream_all_chunks() that overwrites the buffer without advancing the pointer, leaving tail bytes uninitialized. This may lead to information disclosure of sensitive heap data and affect the confidentiality of the target server.

Is CVE-2025-14177 actively exploited?

Active exploitation of CVE-2025-14177 has not been confirmed. Its EPSS score was 0.5% on 2026-10-07, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-14177?

CVE-2025-14177 has a CVSS v3 base score of 7.5 (HIGH severity).

Is CVE-2025-14177 affecting your environment?

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