CVE-2026-46430 json
Algernon: Auto-refresh SSE event server binds to all interfaces by default on Linux/macOS
published 2026-05-20 5 mo ago modified 2026-07-24 3 mo ago also GHSA-gj84-924c-48fx , GO-2026-5401 , EUVD-2026-31869
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 9%
- public exploits
- 0
- none known
Summary
Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server bound to 0.0.0.0:5553 on Linux/macOS by default because the platform-dependent host default in engine/flags.go:39-46 set host = "" for non-Windows, and utils.JoinHostPort("", ":5553") resolves to ":5553". This vulnerability is fixed in 1.17.7.
Patch / fix
- go github.com/xyproto/algernon 1.17.7
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/xyproto/algernon/security/advisories/GHSA-gj84-924c-48fx referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| GitHub | 3.1 | 4.3 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/xyproto/algernon | <1.17.7 |
1.17.7 |
Affected products
- xyproto algernon
Classification
References
-
github.com
/xyproto/algernon/security/advisories/GHSA-gj84-924c-48fx
exploit, web, advisory
-
github.com
/xyproto/algernon
package
Sources
- CVE List CVE-2026-46430
- GitHub Advisory GHSA-gj84-924c-48fx
- NVD CVE-2026-46430
- OSV GO-2026-5401
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