What is CVE-2023-42276?

CVE-2023-42276 is a critical-severity vulnerability in Hutool, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2023-09-08.

How severe is CVE-2023-42276?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Hutool

CVE-2023-42276

hutool v5.8.21 was discovered to contain a buffer overflow via the component jsonArray.

Vulnerability class: Buffer Overflow

Published 2023-09-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.009 · change: +0.001

Affected products

Hutool

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

github.com/dromara/hutool/issues/3286 (Exploit, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2023-42276?: CVE-2023-42276 is a critical-severity vulnerability in Hutool, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2023-09-08.
How severe is CVE-2023-42276?: Critical severity. CVSS v3 base score is 9.8 out of 10.