What is CVE-2026-24811?

CVE-2026-24811 is a critical-severity vulnerability in Root, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2026-01-27.

How severe is CVE-2026-24811?

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

Buffer overflow in Root

CVE-2026-24811

Vulnerability in root-project root (builtins/zlib modules). This vulnerability is associated with program files inffast.C. This issue affects root.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2026-01-27 · 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: 0.003 (25.4th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Root
Root-Project Root — versions 0

Weakness classification (CWE)

References

github.com/root-project/root/pull/18526 (Patch, patch, Issue Tracking)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-24811?: CVE-2026-24811 is a critical-severity vulnerability in Root, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2026-01-27.
How severe is CVE-2026-24811?: Critical severity. CVSS v3 base score is 9.8 out of 10.