# CVE-2026-96763: kvcache-ai mooncake MountSegment Request Processing segment.cpp access control

> Remote attackers can bypass access controls in the MountSegment function to perform unauthorized segment operations.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 24 Sep 2026
- **Updated:** 29 Sep 2026
- **Also known as:** GHSA-c29f-6gh6-wwv9

## What is CVE-2026-96763?

CVE-2026-96763 is a medium-severity missing authorization vulnerability in kvcache-ai mooncake, published on 24 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A security flaw has been discovered in kvcache-ai mooncake up to 0.3.12/0.3.13.post1/0.3.14-rc1. This issue affects the function ScopedSegmentAccess::MountSegment of the file segment.cpp of the component MountSegment Request Processing. Performing a manipulation results in improper access controls. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-284 (Improper Access Control), CWE-266 (Incorrect Privilege Assignment)

## Which versions are affected by CVE-2026-96763?


## How do I fix CVE-2026-96763?

No fix has been published for CVE-2026-96763 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-96763 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-96763 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-96763 and fix it if it is affected.

What it is: CVE-2026-96763 is a medium-severity missing authorization vulnerability in kvcache-ai mooncake, published on 24 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-96763 exists.

Affected product: kvcache-ai mooncake. 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-2026-96763/ (Markdown: https://insights.sbomify.com/CVE-2026-96763/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-96763
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-96763
- OSV: https://osv.dev/vulnerability/CVE-2026-96763

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-96763/
Summaries are generated and may contain mistakes; the official description above is the record.