# CVE-2026-33435: Weblate: Remote code execution during backup restoration

> Attackers can achieve remote code execution by uploading malicious Git or Mercurial configuration files during project backup restoration in Weblate.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 15 Apr 2026
- **Updated:** 15 Apr 2026
- **Also known as:** GHSA-558g-h753-6m33, PYSEC-2026-154

## What is CVE-2026-33435?

CVE-2026-33435 is a high-severity code injection vulnerability in WeblateOrg weblate, published on 15 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Weblate is a web based localization tool. In versions prior to 5.17, the project backup didn't filter Git and Mercurial configuration files which could lead to remote code execution under certain circumstances. This issue has been fixed in version 5.17. If developers are unable to update immediately, they can limit the scope of the vulnerability by restricting access to the project backup, as it is only accessible to users who can create projects.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-434 (Unrestricted Upload of File with Dangerous Type), CWE-23 (Relative Path Traversal)

## Which versions are affected by CVE-2026-33435?

3 open source packages ship an affected version, including weblate and Weblate. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `weblate` | PyPI | All versions | 5.17 |
| `weblate` | PyPI | All versions | 5.17 |
| `Weblate` | PyPI | All versions | 5.17 |

Products: Weblate Weblate.

## How do I fix CVE-2026-33435?

Upgrade weblate to 5.17 or later.

## Is CVE-2026-33435 being exploited?

There is no known exploitation of CVE-2026-33435 in the wild and no public exploit code.

## Other vulnerabilities in WeblateOrg weblate

- [CVE-2025-68398](https://insights.sbomify.com/CVE-2025-68398/): Weblate has git config file overwrite vulnerability that leads to remote code execution (critical 9.1)
- [CVE-2026-34393](https://insights.sbomify.com/CVE-2026-34393/): Weblate: Privilege escalation in the user API endpoint (high 8.8)
- [CVE-2026-34242](https://insights.sbomify.com/CVE-2026-34242/): Weblate: Arbitrary File Read via Symlink (high 7.7)
- [CVE-2025-68279](https://insights.sbomify.com/CVE-2025-68279/): Weblate has an arbitrary file read via symbolic links (high 7.7)
- [CVE-2022-23915](https://insights.sbomify.com/CVE-2022-23915/): Remote Code Execution (RCE) (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33435 and fix it if it is affected.

What it is: CVE-2026-33435 is a high-severity code injection vulnerability in WeblateOrg weblate, published on 15 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-33435 in the wild and no public exploit code.

Affected packages and fixed versions:
- weblate (PyPI): affected all versions; fixed in 5.17
- weblate (PyPI): affected all versions; fixed in 5.17
- Weblate (PyPI): affected all versions; fixed in 5.17

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-2026-33435/ (Markdown: https://insights.sbomify.com/CVE-2026-33435/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33435
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33435
- OSV: https://osv.dev/vulnerability/CVE-2026-33435

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33435/
Summaries are generated and may contain mistakes; the official description above is the record.