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Vulnerability record · CVE-2019-11049 · published 23 December 2019

CVE-2019-11049: Php double free vulnerability

Php · Php

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.

9.8 CVSS 3.1 Critical EPSS 4.2% · top 9.4% CWE-415 · Double free
9.8CVSS 3.1 base score, v2 7.5
4.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
14References
17 Aug 2026Last modified by NVD

Description

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

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.php.net/bug.php?id=78943 Mailing ListPatchVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N7GCOAE6KVHYJ3UQ4KLPLTG
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XWRQPYXVG43Q7DXMXH6UVWM
https://seclists.org/bugtraq/2020/Feb/27 Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20200103-0002/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4626 Third Party Advisory
https://www.tenable.com/security/tns-2021-14 Third Party Advisory
https://bugs.php.net/bug.php?id=78943 Mailing ListPatchVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N7GCOAE6KVHYJ3UQ4KLPLTG
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XWRQPYXVG43Q7DXMXH6UVWM
https://seclists.org/bugtraq/2020/Feb/27 Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20200103-0002/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4626 Third Party Advisory
https://www.tenable.com/security/tns-2021-14 Third Party Advisory

Track CVE-2019-11049 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-11049), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.