Algernon: Single-file mode unconditionally enables debug mode

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Summary

CVECVE-2026-45728
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-26 17:16:47 UTC
Updated2026-05-26 19:26:42 UTC
DescriptionAlgernon 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 PrettyError renderer, which on any Lua or template error response dumps the absolute path of the file that errored, complete byte contents of that file, and exception or parser error text. This response is served with HTTP 200 OK to whoever sent the request that triggered the error. Any client able to reach the server and able to provoke a runtime error in the served script obtains the full server-side source of that script and of any sibling Lua data file consulted during the request. This vulnerability is fixed in 1.17.7.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.000320000 probability, percentile 0.096450000 (date 2026-05-27)

Problem Types: CWE-209 | CWE-489 | CWE-540 | CWE-1188 | CWE-209 CWE-209: Generation of Error Message Containing Sensitive Information | CWE-489 CWE-489: Active Debug Code | CWE-540 CWE-540: Inclusion of Sensitive Information in Source Code | CWE-1188 CWE-1188: Insecure Default Initialization of Resource

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Xyproto Algernon affected < 1.17.7 Not specified

References

ReferenceSourceLinkTags
github.com/xyproto/algernon/security/advisories/GHSA-fwqx-8365-9983 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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