CVE-2019-11049 - CVE House
Back to Database
Status published Medium CVE-2019-11049

mail() may release string with refcount==1 twice

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2019-11049

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Submitted by Christoph M. Becker

References

More from PHP Group

View All →
CVE-2025-6491
NULL Pointer Dereference in PHP SOAP Extension via Large XML Namespace Prefix
Medium 5.9
CVE-2025-1861
Stream HTTP wrapper truncates redirect location to 1024 bytes
Medium 6.3
CVE-2025-1736
Stream HTTP wrapper header check might omit basic auth header
Medium 6.3
CVE-2025-1735
pgsql extension does not check for errors during escaping
Medium 5.9
CVE-2025-1734
Streams HTTP wrapper does not fail for headers with invalid name and no colon
Medium 6.3

Affected Vendor

Affected Software

PHP
Vulnerable Versions:
7.3.x, 7.4.x

Timeline

Official Publish: December 23rd, 2019
Last Modified: September 16th, 2024
Added to House: July 20th, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

Weaknesses (CWE)

CWE-415

MITRE ATT&CK TTPs

T1499 Endpoint Denial of Service
Impact
T1190 Exploit Public-Facing Application
Initial Access
T1574 Hijack Execution Flow
Privilege Escalation
T1059 Command and Scripting Interpreter
Execution
T1485 Data Destruction
Impact