Is CVE-2015-4026 in the CISA KEV catalog?

No. CVE-2015-4026 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-4026?

CVE-2015-4026 has a CVSS v2 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2015-4026?

CVE-2015-4026 has an EPSS score of 19.18% (97th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2015-4026

HIGHEPSS 97th pctl

7.5

CVSS v2

NVD

Description

The pcntl_exec implementation in PHP before 5.4.41, 5.5.x before 5.5.25, and 5.6.x before 5.6.9 truncates a pathname upon encountering a \x00 character, which might allow remote attackers to bypass intended extension restrictions and execute files with unexpected names via a crafted first argument. NOTE: this vulnerability exists because of an incomplete fix for CVE-2006-7243.

CWE-19

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

19.18%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.