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CriticalPHP

CVE-2019-11049

In PHP versions 7.3.x below 7.3.13 and 7.4.0 on Windows, when supplying custom headers to mail() function, due to mistake introduced in commit 78f4b4a2dcf92ddbccea1bb95f8390a18ac3342e, if the header is supplied in lowercase, this can result in double-freeing certain memory locations.

CVSS Base Score
9.8

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

Exploit Probability
90%EPSS PERCENTILE0100

More exploitable than 90% of all CVEs · Top 10%

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Details
Published
2019-12-23
Last modified
2026-08-17
Affected
PHP
References
NVD Detail OSV.dev GitHub Advisories

Related exploited CVEs in PHP

CVE-2019-11045
Medium · 5.9 CVSSPHP
CVE-2019-11050
Medium · 6.5 CVSSPHP
CVE-2019-11044
High · 7.5 CVSSPHP

Data from the National Vulnerability Database (NVD), CISA KEV, and FIRST.org EPSS. This product uses the NVD API but is not endorsed or certified by the NVD. EPSS is a probability estimate, not a guarantee of exploitation.