How severe is CVE-2016-7398?

CVE-2016-7398 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-7398 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-7398?

CVE-2016-7398 primarily affects Php Ext-http. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-7398?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2016-7398 published?

CVE-2016-7398 was published on 2019-09-06 and last updated on 2026-06-17.

CVE-2016-7398

CVE-2016-7398 is a critical-severity vulnerability in Php Ext-http with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-704.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-704
Affected product: Php Ext-http
Published: 2019-09-06
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2016-7398?: 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.
How severe is CVE-2016-7398?: CVE-2016-7398 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-7398 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-7398?: CVE-2016-7398 primarily affects Php Ext-http. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-7398?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2016-7398 published?: CVE-2016-7398 was published on 2019-09-06 and last updated on 2026-06-17.

References

Affected products (9)

cpe:2.3:a:php:ext-http:*:*:*:*:*:*:*:*
cpe:2.3:a:php:ext-http:2.6.0:-:*:*:*:*:*:*
cpe:2.3:a:php:ext-http:2.6.0:beta1:*:*:*:*:*:*
cpe:2.3:a:php:ext-http:2.6.0:beta2:*:*:*:*:*:*
cpe:2.3:a:php:ext-http:2.6.0:rc1:*:*:*:*:*:*
cpe:2.3:a:php:ext-http:3.1.0:*:*:*:*:*:*:*
cpe:2.3:a:php:ext-http:3.1.0:beta1:*:*:*:*:*:*
cpe:2.3:a:php:ext-http:3.1.0:beta2:*:*:*:*:*:*
cpe:2.3:a:php:ext-http:3.1.0:rc1:*:*:*:*:*:*

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