Attackers exploit UnrealIRCd flaw enabling server-level command injection
Original title: Attackers Exploit UnrealIRCd Flaw That Enables Server-Level Command Injection
CVE-2026-114713 in UnrealIRCd 6.0.0 before 6.2.7.1 lets linked-network users inject server commands; US agencies must patch by November 16.
CISA added CVE-2026-114713, a high-severity UnrealIRCd flaw scored 8.6, to its Known Exploited Vulnerabilities catalog after reports of active exploitation. The labeled-response module does not escape IRCv3 label tags, so a user on a network with two or more linked servers can inject server-to-server commands executed with server authority. Maintainer Bram Matthys released 6.2.7.1 on November 7 and said exploitation was already underway; attack details and goals remain unknown.
Unconfirmed: The exact malicious activity and its goals are unknown.
- The flaw allows arbitrary commands with server or IRCOp privileges.
- Exploitation attempts began a day after the November 7 hotfix, Matthys said.
- He called it the most critical UnrealIRCd issue in 15 years.
- FCEB agencies must apply fixes by November 16 under BOD 26-04.
Impact: arbitrary server commands with server or IRCOp privileges
| Product | Affected | Fixed in |
|---|---|---|
| UnrealIRCd | 6.0.0 before 6.2.7.1 | 6.2.7.1 |
- 1.Update to UnrealIRCd 6.2.7.1 or apply the hotfix.
- 2.Deploy the spamfilter workaround if the server is not yet updated.
- 3.FCEB agencies must apply fixes by November 16, 2026.
- CVEs
- CVE-2026-114713
- Vendors
- UnrealIRCd
- Organizations
- CISA
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-114713 | Label tag injection in UnrealIRCd before 6.2.7.1 | 8.6 | <1% | KEVPoC ×2 | KEV |
From the original article
1 min read at thehackernews.com
The U. S. Cybersecurity and Infrastructure Security Agency (CISA) on Friday added a high-severity security flaw impacting UnrealIRCd, an open-source Internet Relay Chat (IRC) server, to its Known Exploited Vulnerabilities (KEV) catalog, following reports of active exploitation.
thehackernews.com
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