CVE-2015-2331: Integer overflow in the _zip_cdir_new function in zip_dirent.c in libzip 0.11.2 and earlier, as used in the ZIP exten…

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of 29 Oct 2026.

VulnCheck KEV lists it since 6 May 2024. It cites 1 public report, the first from 6 May 2024.

• fortinet.com

How likely is exploitation in the next 30 days?

27.4%

EPSS score, percentile 98.1 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

Not scored

The CVE record carries no CVSS score.

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (12)

Which versions are affected?

Not stated. The CVE record gives vendor and product as “n/a” and the version as “unspecified”.

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; VulnCheck KEV, as of 30 Oct 2026; FIRST EPSS, as of 30 Oct 2026; CVE List, as of 30 Oct 2026. About the data.

Description

Integer overflow in the _zip_cdir_new function in zip_dirent.c in libzip 0.11.2 and earlier, as used in the ZIP extension in PHP before 5.4.39, 5.5.x before 5.5.23, and 5.6.x before 5.6.7 and other products, allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a ZIP archive that contains many entries, leading to a heap-based buffer overflow.

Source: CVE List, as of 30 Oct 2026. About the data.

What to do

Advisories and patches

• DSA-3198 (Vendor advisory)
• openSUSE-SU-2015:0615 (Vendor advisory)
• HPSBMU03409 (Vendor advisory)
• openSUSE-SU-2015:0644 (Vendor advisory)
• FEDORA-2015-4699 (Vendor advisory)
• FEDORA-2015-4556 (Vendor advisory)
• APPLE-SA-2015-09-30-3 (Vendor advisory)
• HPSBMU03380 (Vendor advisory)
• MDVSA-2015:079 (Vendor advisory)
• SSRT102066 (Vendor advisory)
• FEDORA-2015-4559 (Vendor advisory)
• FEDORA-2015-4565 (Vendor advisory)

This summary is based on the CVE record as of 30 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

The CVE record does not name affected products or versions: vendor and product are “n/a” and the version is “unspecified”.

Source: CVE List, as of 30 Oct 2026. About the data.

Timeline