Detections
Analytics

SCA: security update for @astrojs/rss (GHSA-8j5q-mfj2-5q9q)

medium Tenable Cloud Security Plugin ID 445925

Description

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

 - Astro is a web framework for content-driven websites. In versions 1.0.0 through 4.0.18, the source.title
 and enclosure.type item fields in packages/astro-rss/src/index.ts are interpolated directly into XML
 template strings without XML-character escaping before being parsed by fast-xml-parser. Both fields are
 validated only as z.string(), placing no restriction on XML special characters. An attacker who controls
 these values can inject arbitrary XML into the generated RSS feed: a value containing " can break out of
 an attribute (as with enclosure.type), and a value containing </source> can close an element early and
 inject additional nodes (as with source.title). This corrupts feed structure, injects false metadata (for
 example, a fake <link> pointing to a malicious URL), and can cause feed readers to misparse or display
 attacker-controlled content. In SSR mode (output: 'server'), the poisoned feed is served on every request
 to all subscribers. This issue has been fixed in version 4.0.19. (CVE-2026-59728)

Solution

Update the @astrojs/rss library and its related packages to version 4.0.19 or later.

See Also

https://github.com/advisories/GHSA-8j5q-mfj2-5q9q

Plugin Details

Severity: Medium

ID: 445925

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 8/13/2026

Updated: 8/13/2026

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

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:N/I:P/A:N

CVSS Score Source: CVE-2026-59728

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:N/I:L/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: 7/20/2026

Vulnerability Publication Date: 7/20/2026

Reference Information

CVE: CVE-2026-59728

cwe: CWE-91