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SCA: security update for github.com/xyproto/algernon (GHSA-hw27-4v2q-5qff)

medium Tenable Self-Hosted Container Security Plugin ID 442247

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server's Access-
 Control-Allow-Origin response header was hardcoded to the wildcard * regardless of the caller's Origin.
 Because EventSource does not preflight and does not send cookies, the wildcard is sufficient to let any
 third-party page the developer visits open a cross-origin EventSource to the SSE port and read the live
 filename stream from JavaScript. This vulnerability is fixed in 1.17.7. (CVE-2026-46431)

Solution

Update the github.com/xyproto/algernon library and its related packages to version 1.17.7 or later.

See Also

https://github.com/advisories/GHSA-hw27-4v2q-5qff

Plugin Details

Severity: Medium

ID: 442247

Version: Revision 1.4

Type: Local

Family: SCA Checks

Published: 5/20/2026

Updated: 6/15/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 2.2

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2026-46431

CVSS v3

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/20/2026

Vulnerability Publication Date: 5/20/2026

Reference Information

CVE: CVE-2026-46431

cwe: CWE-942