Critical 9.3Published Jan 27, 2026

CVE-2026-24812An improper pointer arithmetic in root-project/root at builtins/zlib/inftrees.c

Updated under an hour ago (Oct 27, 2026, 6:30 AM ET)

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It affects root-project root. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

Vulnerability in root-project root (builtins/zlib modules). This vulnerability is associated with program files inftrees.C. This issue affects root: through 6.36.00-rc1.

CVSS: 9.3 CRITICAL (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H/S:N/AU:Y/R:U/V:D/RE:M/U:Amber
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GovTech CSG
NVD analysis: Deferred
Record last updated: Mar 3, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

root-project root root_project:root (from the name)	through 6.36.00-rc1	CNA record

References

References

https://github.com/root-project/root/pull/18527	patch
https://root.cern/blog/recent-common-vulnerabilities-when-does-ROOT-need-to-be-updated/

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.