# CVE-2026-58502: githubtoplanguages: Command Injection via Issue Title in Discord Notification Workflow

> Attackers can execute arbitrary commands on GitHub Actions runners via malicious issue titles, potentially exposing secrets and spoofing notifications.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/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:** 15 Sep 2026
- **Updated:** 17 Sep 2026
- **Also known as:** GHSA-c3xh-98xp-6qhf

## What is CVE-2026-58502?

CVE-2026-58502 is a high-severity command injection vulnerability in gouef githubtoplanguages, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

githubtoplanguages generates a user's top GitHub languages as an SVG. The .github/workflows/discord-issue.yml workflow runs when an issue is opened or closed and interpolates github.event.issue.title directly into the Bash assignment for ISSUE_TITLE before shell parsing. An issue title containing shell command-substitution syntax can therefore execute commands on the GitHub Actions runner before the title is included in the Discord notification sent through DISCORD_WEBHOOK. Successful exploitation can manipulate or spoof trusted bot notifications and may expose the Discord webhook secret or other workflow environment data, depending on repository permissions. This issue is fixed by commit 6bf9c3a9cb66c937b9047ca266b3d02f2bb11027.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-58502?

1 open source package ship an affected version, including gouef/githubtoplanguages.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `gouef/githubtoplanguages` | GitHub Actions | All versions | 1.1.4 |

## How do I fix CVE-2026-58502?

Upgrade gouef/githubtoplanguages to 1.1.4 or later.

## Is CVE-2026-58502 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58502 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-58502 and fix it if it is affected.

What it is: CVE-2026-58502 is a high-severity command injection vulnerability in gouef githubtoplanguages, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58502 exists.

Affected packages and fixed versions:
- gouef/githubtoplanguages (GitHub Actions): affected all versions; fixed in 1.1.4

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-2026-58502/ (Markdown: https://insights.sbomify.com/CVE-2026-58502/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-58502
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-58502
- OSV: https://osv.dev/vulnerability/CVE-2026-58502

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-58502/
Summaries are generated and may contain mistakes; the official description above is the record.