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VulnerabilityPublished

CVE-2026-46430: xyproto algernon · Resource Exposure

Affects xyproto algernonSource CVE Database V5

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Not known to be exploited · CVSS 4.3 Medium : upgrade to 1.17.7 when convenient.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
4.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.17.7
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade algernon and github.com/xyproto/algernon to 1.17.7.

Affected software

ProductAffectedFixed in
xyprotoalgernonAffected
  • <1.17.7
Fixed in
  • 1.17.7
Gogithub.com/xyproto/algernonpkg:golang/github.com/xyproto/algernonOther threatsAffected
  • <1.17.7
Fixed in
  • 1.17.7

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade to xyproto algernon version 1.17.7 or later, where this issue is fixed. No additional mitigation steps are indicated.

Description

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.

References

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