# CVE-2017-1000115: Mercurial missing symlink check

> Attackers can use malicious repositories to modify files outside the repository directory due to missing symlink checks in Mercurial.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 4 Oct 2017
- **Updated:** 5 Aug 2024
- **Also known as:** ALPINE-CVE-2017-1000115, DEBIAN-CVE-2017-1000115, GHSA-hvr9-wr9p-grgr, PYSEC-2017-88, UBUNTU-CVE-2017-1000115

## What is CVE-2017-1000115?

CVE-2017-1000115 is a high-severity path traversal vulnerability in Debian Debian Linux, published on 4 Oct 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Mercurial prior to version 4.3 is vulnerable to a missing symlink check that can malicious repositories to modify files outside the repository

Weakness: CWE-59 (Improper Link Resolution Before File Access)

## Which versions are affected by CVE-2017-1000115?

3 open source packages ship an affected version, including mercurial. It affects 8 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mercurial` | PyPI | All versions | 4.3 |
| `mercurial` | PyPI | All versions | 4.3.1 |
| `mercurial` | PyPI | All versions | 4.3.1 |

Products: Debian Debian Linux, Mercurial Mercurial, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus, Redhat Enterprise Linux Server Eus, Redhat Enterprise Linux Server Tus, Redhat Enterprise Linux Workstation.

## How do I fix CVE-2017-1000115?

Upgrade mercurial to a fixed version for your release line: 4.3 or 4.3.1.

## Is CVE-2017-1000115 being exploited?

There is no known exploitation of CVE-2017-1000115 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-1000115 and fix it if it is affected.

What it is: CVE-2017-1000115 is a high-severity path traversal vulnerability in Debian Debian Linux, published on 4 Oct 2017. 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-2017-1000115 in the wild and no public exploit code.

Affected packages and fixed versions:
- mercurial (PyPI): affected all versions; fixed in 4.3
- mercurial (PyPI): affected all versions; fixed in 4.3.1
- mercurial (PyPI): affected all versions; fixed in 4.3.1

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-2017-1000115/ (Markdown: https://insights.sbomify.com/CVE-2017-1000115/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-1000115
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-1000115
- OSV: https://osv.dev/vulnerability/CVE-2017-1000115

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-1000115/
Summaries are generated and may contain mistakes; the official description above is the record.