What is CVE-2026-45728?

CVE-2026-45728 is a high-severity vulnerability in Xyproto Algernon, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 7.5/10. Published 2026-05-26.

How severe is CVE-2026-45728?

High severity. CVSS v3 base score is 7.5 out of 10.

RCE in Xyproto Algernon

CVE-2026-45728

Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, when Algernon is invoked with a single file path instead of a directory, singleFileMode is set to true and debugMode is forcibly enabled. debugMode activates the Prett…

EPSS: 0.000 (13.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Xyproto Algernon — versions < 1.17.7

Weakness classification (CWE)

CWE-209 — Generation of Error Message Containing Sensitive Information
CWE-489 — Active Debug Code
CWE-540
CWE-1188 — Initialization of a Resource with an Insecure Default

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-45728?: CVE-2026-45728 is a high-severity vulnerability in Xyproto Algernon, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 7.5/10. Published 2026-05-26.
How severe is CVE-2026-45728?: High severity. CVSS v3 base score is 7.5 out of 10.