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

> Improper pointer arithmetic in the zlib module of the ROOT framework allows attackers to cause memory corruption, potentially leading to code execution or crashes.

- **Severity:** Critical 9.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Jan 2026
- **Updated:** 3 Mar 2026
- **Also known as:** AZL-75357, AZL-75366, AZL-75393, GHSA-3qgq-r69m-f2f7

## What is CVE-2026-24812?

CVE-2026-24812 is a critical memory corruption vulnerability in root-project root, published on 27 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-24812?


## How do I fix CVE-2026-24812?

No fix has been published for CVE-2026-24812 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-24812 being exploited?

There is no known exploitation of CVE-2026-24812 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-24812 and fix it if it is affected.

What it is: CVE-2026-24812 is a critical memory corruption vulnerability in root-project root, published on 27 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-24812 in the wild and no public exploit code.

Affected product: root-project root. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-24812/ (Markdown: https://insights.sbomify.com/CVE-2026-24812/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-24812
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-24812
- OSV: https://osv.dev/vulnerability/CVE-2026-24812

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-24812/
Summaries are generated and may contain mistakes; the official description above is the record.