No exploitation reportedFix available

CVE-2015-8876

Q: Is CVE-2015-8876 actively exploited?

Active exploitation of CVE-2015-8876 has not been confirmed. Its EPSS score was 7.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2015-8876?

CVE-2015-8876 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2016-05-22
Fixed in5.6.12 · 5.5.28 · 5.4.44

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Zend/zend_exceptions.c in PHP before 5.4.44, 5.5.x before 5.5.28, and 5.6.x before 5.6.12 does not validate certain Exception objects, which allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) or trigger unintended method execution via crafted serialized data.

Timeline

dates in UTC

2016-05-2201:59CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2015-8876?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2015-8876?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

PHP

Branch	Affected	Fixed in	Source
5.6	≥ 5.6.0, < 5.6.12	5.6.12	NVD
5.5	≥ 5.5.0, < 5.5.28	5.5.28	NVD
5.4	≥ 5.4.0, < 5.4.44	5.4.44	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update PHP to 5.6.12 · 5.5.28 · 5.4.44

Advisories and patches

www.php.netVendor Advisory
bugs.php.netVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.09.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
FIRST EPSSEPSS score7.7 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2016-05-22
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2015-8876?

Is CVE-2015-8876 actively exploited?

Active exploitation of CVE-2015-8876 has not been confirmed. Its EPSS score was 7.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2015-8876?

CVE-2015-8876 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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