CVE-2025-14177

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.

CVSS Details

CVSS Score

7.5

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Configurations (Affected Products)

cpe:2.3:a:php:php:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:a:php:php:8.5.0:*:*:*:*:*:*:* - VULNERABLE

PHP 8.1.0 - 8.1.33

PHP 8.2.0 - 8.2.29

PHP 8.3.0 - 8.3.28

PHP 8.4.0 - 8.4.15

PHP 8.5.0

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<?php
// PoC for CVE-2025-14177
// Read image via php://filter to trigger heap memory leak
$imageData = file_get_contents('php://filter/read=convert.base64-encode/resource=image.jpg');
$imageInfo = getimagesize('php://memory');
?>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-14177
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-14177
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-14177/
[4] VulDB https://vuldb.com/cve/CVE-2025-14177
[5] https://github.com/php/php-src/security/advisories/GHSA-3237-qqm7-mfv7

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-14177", "sourceIdentifier": "[email protected]", "published": "2025-12-27T20:15:40.400", "lastModified": "2026-01-08T22:03:28.630", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 6.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-125"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.1.0", "versionEndExcluding": "8.1.34", "matchCriteriaId": "56FCF002-3946-40DF-A774-75C6DDE6CA26"}, {"vulnerable": true, "criteria": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.2.0", "versionEndExcluding": "8.2.30", "matchCriteriaId": "AB314013-4F2F-40F0-968B-35FEC22CC8A4"}, {"vulnerable": true, "criteria": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.3.0", "versionEndExcluding": "8.3.29", "matchCriteriaId": "DAD5402D-688D-44AA-B083-5157FDC53D7A"}, {"vulnerable": true, "criteria": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.4.0", "versionEndExcluding": "8.4.16", "matchCriteriaId": "8813328B-AC06-4060-916F-CD27144F41E2"}, {"vulnerable": true, "criteria": "cpe:2.3:a:php:php:8.5.0:*:*:*:*:*:*:*", "matchCriteriaId": "F7465128-DC9D-49F2-BFC2-6B307D7BC373"}]}]}], "references": [{"url": "https://github.com/php/php-src/security/advisories/GHSA-3237-qqm7-mfv7", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}]}}