CVE-2016-7398

Exp

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.

Published: 2019-09-06 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-7398 is rated High Exploit Risk (87.9/100): CVSS Critical severity, with high exploitation likelihood (EPSS 6.80%, 93th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.07% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2016-7398

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2016-7398

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 5.72% 6.80% +1.07%
2 2026-03-04 3.20% 5.72% +2.52%
3 2026-03-01 — 3.20% —

Full EPSS history (37 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-7398

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2016-7398

OS Trackers for CVE-2016-7398

vendor priority summary link
debian not yet assigned CVE-2016-7398 not yet assigned priority: Debian including 1 source packages (php-pecl-http), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-7398
ubuntu medium CVE-2016-7398 medium priority: Ubuntu including 1 source packages (php-pecl-http), 18 status rows across 18 suites (bionic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 14, DNE 1, ignored 1, needed 1, released 1. https://ubuntu.com/security/CVE-2016-7398

Affected software / configurations for CVE-2016-7398

Vendor Product Version Raw CPE
php ext-http <= 2.5.6 cpe:2.3:a:php:ext-http:*:*:*:*:*:*:*:*
php ext-http >= 3.0.0, <= 3.0.1 cpe:2.3:a:php:ext-http:*:*:*:*:*:*:*:*
php ext-http 2.6.0 cpe:2.3:a:php:ext-http:2.6.0:-:*:*:*:*:*:*
php ext-http 2.6.0 cpe:2.3:a:php:ext-http:2.6.0:beta1:*:*:*:*:*:*
php ext-http 2.6.0 cpe:2.3:a:php:ext-http:2.6.0:beta2:*:*:*:*:*:*
php ext-http 2.6.0 cpe:2.3:a:php:ext-http:2.6.0:rc1:*:*:*:*:*:*
php ext-http 3.1.0 cpe:2.3:a:php:ext-http:3.1.0:*:*:*:*:*:*:*
php ext-http 3.1.0 cpe:2.3:a:php:ext-http:3.1.0:beta1:*:*:*:*:*:*
php ext-http 3.1.0 cpe:2.3:a:php:ext-http:3.1.0:beta2:*:*:*:*:*:*
php ext-http 3.1.0 cpe:2.3:a:php:ext-http:3.1.0:rc1:*:*:*:*:*:*

References for CVE-2016-7398

cvelogic Threat Intelligence