headerv2.go in mastercactapus proxyprotocol before 0.0.2, as used in the mastercactapus…
Priority MEDIUM 40CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
headerv2.go in mastercactapus proxyprotocol before 0.0.2, as used in the mastercactapus caddy-proxyprotocol plugin through 0.0.2 for Caddy, allows remote attackers to cause a denial of service (webserver panic and daemon crash) via a crafted HAProxy PROXY v2 request with truncated source/destination address data.
Why it matters now
EPSS 0.04295 91st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed github.com/mastercactapus/proxyprotocol (Go): 0.0.2
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | github.com/mastercactapus/proxyprotocol (Go) | before 0.0.2 | 0.0.2 | Patch available | GHSA-85c5-ccm8-vr96 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- github.com/mastercactapus/proxyprotocol (Go) Vendor— Affected before 0.0.2 Fixed in 0.0.2 Patch available GHSA-85c5-ccm8-vr96
Remediation
- Fix · GHSA-85c5-ccm8-vr96 github.com/mastercactapus/proxyprotocol (Go) Fixed in 0.0.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2019-14243
- 2026-10-03 Alias added: GHSA-85c5-ccm8-vr96
References
Patch 1
Advisory 5
- https://caddy.community/t/dos-in-http-proxyprotocol-plugin/6014
- https://github.com/mastercactapus/caddy-proxyprotocol/issues/8
- https://github.com/mastercactapus/proxyprotocol/compare/ef496d7...5c4a101
- https://github.com/mastercactapus/proxyprotocol/releases/tag/v0.0.2
- https://nvd.nist.gov/vuln/detail/CVE-2019-14243
Sources
- CVE-2019-14243 · CVE Program
- CVE-2019-14243 · NVD
- FIRST EPSS
- GHSA-85c5-ccm8-vr96 · 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