Security readout for executives and security teams
Plain-English summary
CVE-2026-24812 is a critical flaw in ROOT’s bundled zlib code. The published score indicates potential remote, unauthenticated impact without user interaction. Organizations using ROOT through 6.36.00-rc1 should prioritize assessment and vendor-guided updating, especially where ROOT-backed services are network reachable.
Executive priority
High priority for organizations using ROOT in network-accessible or production workflows. The severity is critical, but urgency should be driven by confirmed presence of affected ROOT builds and vendor patch availability.
Technical view
The issue is described as improper pointer arithmetic associated with builtins/zlib/inftrees.c or inftrees.C in root-project/root. It is mapped to CWE-125 and affects ROOT through 6.36.00-rc1. CVSS 4.0 is 9.3 with network attack vector, low complexity, no privileges, and no user interaction.
Likely exposure
Exposure is likely limited to environments running affected ROOT versions, especially builds using the bundled zlib module. The CVSS vector indicates network reachability is relevant, but the provided sources do not describe specific vulnerable application workflows.
Exploitation context
No provided source states active exploitation, and the CVE is not listed as KEV in the bundle. Public evidence supports high theoretical severity, not confirmed exploitation in the wild.
Researcher notes
The public bundle identifies the vulnerable area and a patch reference but does not provide detailed root cause analysis, exploitability notes, or affected configuration nuances. Avoid assuming exploit status beyond the CVSS and vendor-linked patch evidence.
Mitigation direction
- Identify ROOT deployments and versions across servers, workstations, containers, and scientific pipelines.
- Review ROOT PR 18527 and apply the vendor-supported patch or fixed release when available.
- If patching is delayed, reduce network exposure of ROOT-dependent services.
- Monitor ROOT’s advisory blog and CVE record for updated remediation guidance.
Validation and detection
- Confirm whether installed ROOT versions are through 6.36.00-rc1.
- Check whether the bundled zlib module is present in deployed builds.
- Verify whether changes from ROOT PR 18527 are included.
- Run dependency or vulnerability scanning for CVE-2026-24812.
- Document systems where remediation is pending and compensating controls apply.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-125: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-24812 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.3 (4.0)
- Known Exploited
- No
- Published
Vector: 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
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
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——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: 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
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/root-project/root/pull/18527CVE reference · patch
- https://root.cern/blog/recent-common-vulnerabilities-when-does-ROOT-need-to-be-updated/CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.