CVE-2016-7398

A type confusion vulnerability in the merge_param() function of php_http_params.c in PHP's pecl...

9.8 CriticalFix available

A type confusion vulnerability in the merge_param() function of php_http_params.c in PHP's pecl-http extension 3.1.0beta2 (PHP 7) and earlier as well as 2.6.0beta2 (PHP 5) and earlier allows attackers to crash PHP and possibly execute arbitrary code via crafted HTTP requests.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

6.80%Up 4.3 points since Feb 4, 2022

What each source reports

NVD Score used 9.8

Record: CVE-2016-7398
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-704
Updated: 2026-11-02

CVE List No score

Record: CVE-2016-7398
Updated: 2026-11-02

EUVDEUVD-2016-8254 No score

Record: EUVD-2016-8254
Updated: 2026-11-03

GitHub AdvisoriesGHSA-jx2x-3hjr-6vp8 9.8

A type confusion vulnerability in the merge_param() function of php_http_params.c in PHP's pecl...

Record: GHSA-jx2x-3hjr-6vp8
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-704
Updated: 2026-11-02

OSV 9.8

Record: CVE-2016-7398
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2016-7398 9.8

Record: DEBIAN-CVE-2016-7398
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2016-7398 9.8

Record: UBUNTU-CVE-2016-7398
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

php ext-http

Affected packages

Affected packages
Package	Affected	Fixed
`php-pecl-http` Debian:12	before 3.1.0+2.6.0-1	3.1.0+2.6.0-1
`php-pecl-http` Debian:13	before 3.1.0+2.6.0-1	3.1.0+2.6.0-1
`php-pecl-http` Debian:14	before 3.1.0+2.6.0-1	3.1.0+2.6.0-1
`php-pecl-http` Debian:8	before 2.0.4-1+deb8u1, plus listed versions 2.0.4-1	2.0.4-1+deb8u1
`php-pecl-http` Ubuntu:16.04:LTS	All versions, plus listed versions 2.0.4-1build13.0.1-0ubuntu23.0.1-0ubuntu33.0.1-0ubuntu43.0.1-0ubuntu5	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2016-7398 is a critical vulnerability (CVSS 9.8) in Php Ext-http, published September 6, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 6.80%, the 94th percentile. Fixed in php-pecl-http 3.1.0+2.6.0-1.