Improper handling of multiline messages in matrix-appservice-irc
Priority MEDIUM 42CWE-74Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
matrix-appservice-irc is a Node.js IRC bridge for Matrix. The vulnerability in node-irc allows an attacker to manipulate a Matrix user into executing IRC commands by having them reply to a maliciously crafted message. The vulnerability has been patched in matrix-appservice-irc 0.33.2. Refrain from replying to messages from untrusted participants in IRC-bridged Matrix rooms. There are no known workarounds for this issue.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01005 63rd percentileScored 2026-11-07
Fix Fixed matrix-appservice-irc (matrix-org): 0.34.0matrix-appservice-irc (npm): 0.33.2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| matrix-org | matrix-appservice-irc | before 0.34.0 | 0.34.0 | Patch available | CNA |
| — | matrix-appservice-irc (npm) | before 0.33.2 | 0.33.2 | Patch available | GHSA-37hr-348p-rmf4 |
- matrix-appservice-irc Vendormatrix-org Affected before 0.34.0 Fixed in 0.34.0 Patch available CNA
- matrix-appservice-irc (npm) Vendor— Affected before 0.33.2 Fixed in 0.33.2 Patch available GHSA-37hr-348p-rmf4
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:matrix:matrix_irc_bridge:*:*:*:*:*:node.js:*:* | before 0.33.2 | Vulnerable | matrix-org |
- cpe:2.3:a:matrix:matrix_irc_bridge:*:*:*:*:*:node.js:*:* Versions before 0.33.2 Vulnerable ·matrix-org
Remediation
- Fix · CNA matrix-appservice-irc (matrix-org) Fixed in 0.34.0
- Fix · GHSA-37hr-348p-rmf4 matrix-appservice-irc (npm) Fixed in 0.33.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2022-29166
- 2026-10-03 Alias added: GHSA-37hr-348p-rmf4
References
Advisory 3
More matrix-org Matrix Irc Bridge vulnerabilities
- TI-2023-20039 matrix-appservice-irc IRC command injection via admin commands containing newlines CVSS 3.1CRITICAL 9.8
- TI-2022-18583 Parsing issue in matrix-org/node-irc leading to room takeovers CVSS 3.1HIGH 8.8
- TI-2022-18582 IRC mode parameter confusion in matrix-appservice-irc CVSS 3.1MEDIUM 6.3
- TI-2022-03640 matrix-appservice-irc PgDataStore.ts sql injection CVSS 3.1MEDIUM 5.6
- TI-2025-20003 Matrix IRC Bridge allows IRC command injection to own puppeted user CVSS 3.1MEDIUM 4.3
- TI-2023-20048 matrix-appservice-irc events can be crafted to leak parts of targeted messages from other bridged rooms CVSS 3.1LOW 3.7
Sources
- CVE-2022-29166 · CVE Program
- CVE-2022-29166 · NVD
- FIRST EPSS
- GHSA-37hr-348p-rmf4 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences