Critical severity · published Jan 27, 2026
CVE-2026-24811
An improper pointer arithmetic in root-project/root at builtins/zlib/inffast.c
9.8
CVSS
0.4%
EPSS
No
On KEV
Description
Vulnerability in root-project root (builtins/zlib modules). This vulnerability is associated with program files inffast.C.
This issue affects root.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RO
root · root-project
through 6.36.00-rc1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-24811
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-24811
Issue Tracking
https://github.com/root-project/root/pull/18526
root.cern
https://root.cern/blog/recent-common-vulnerabilities-when-does-ROOT-need-to-be-updated/
More from root
9.3
CVE-2026-24812
An improper pointer arithmetic in root-project/root at builtins/zlib/inftrees.c