What is CVE-2023-3824?

CVE-2023-3824 is a critical-severity vulnerability in PHP, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.4/10. Published 2023-08-11.

How severe is CVE-2023-3824?

Critical severity. CVSS v3 base score is 9.4 out of 10.

Is CVE-2023-3824 known to be exploited?

23 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in PHP

CVE-2023-3824

In PHP version 8.0.* before 8.0.30, 8.1.* before 8.1.22, and 8.2.* before 8.2.8, when loading phar file, while reading PHAR directory entries, insufficient length checking may lead to a stack buffer overflow, leading potentially to memory corruption or RCE.

Vulnerability class: Buffer Overflow

Published 2023-08-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.218 (97.6th percentile), scored 2026-09-29.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.218 · newest: 0.218 · change: 0.000

Affected products

PHP
PHP Group — versions 8.0.*, 8.1.*, 8.2.*
Debian Linux — versions 10.0
Fedoraproject Fedora — versions 38

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

References

github.com/php/php-src/security/advisories/GHSA-jqcx-ccgc-xwhv (Exploit, Third Party Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List)
security.netapp.com/advisory/ntap-20230825-0001/ (Third Party Advisory)
lists.debian.org/debian-lts-announce/2023/09/msg00002.html (Mailing List)

Frequently asked questions

What is CVE-2023-3824?: CVE-2023-3824 is a critical-severity vulnerability in PHP, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.4/10. Published 2023-08-11.
How severe is CVE-2023-3824?: Critical severity. CVSS v3 base score is 9.4 out of 10.
Is CVE-2023-3824 known to be exploited?: 23 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.