# CVE-2026-56138: Authenticated Path Traversal in AIL framework /objects/item/diff Allows Reading Gzip-Compressed Files

> Authenticated users can exploit path traversal in the diff endpoint to read arbitrary gzip-compressed files accessible to the AIL process.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Jun 2026
- **Updated:** 22 Jun 2026
- **Also known as:** GHSA-jmhf-2rhf-v8gj

## What is CVE-2026-56138?

CVE-2026-56138 is a medium-severity path traversal vulnerability in ail-project ail-framework, published on 19 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

AIL framework contains a path traversal vulnerability in the /objects/item/diff endpoint. The endpoint accepts item identifiers through the s1 and s2 query parameters and, prior to the fix, attempted to retrieve and compare item contents without first verifying that both referenced items existed as valid AIL objects.

An authenticated AIL user could craft malicious item identifiers containing path traversal sequences to cause the application to read gzip-compressed files accessible to the AIL process. This could result in unauthorized disclosure of local file contents, limited to files readable by the application and compatible with the expected gzip-compressed item format.

The issue was fixed by validating that both requested items exist before their contents are accessed.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-56138?


## How do I fix CVE-2026-56138?

No fix has been published for CVE-2026-56138 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-56138 being exploited?

There is no known exploitation of CVE-2026-56138 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-56138 and fix it if it is affected.

What it is: CVE-2026-56138 is a medium-severity path traversal vulnerability in ail-project ail-framework, published on 19 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-56138 in the wild and no public exploit code.

Affected product: ail-project ail-framework. 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-2026-56138/ (Markdown: https://insights.sbomify.com/CVE-2026-56138/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-56138
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-56138
- OSV: https://osv.dev/vulnerability/CVE-2026-56138

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-56138/
Summaries are generated and may contain mistakes; the official description above is the record.