Detections
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SCA: security update for css_parser (GHSA-9pmc-p236-855h)

high Tenable Cloud Security Plugin ID 444563

Description

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

 - css_parser is a Ruby CSS parser. From 2.2.0 until 3.0.0, CssParser::Parser#read_remote_file in
 lib/css_parser/parser.rb, and therefore load_uri! and the @import-following branch of add_block!, issued
 HTTP and HTTPS requests against any host, port, and URI without a scheme allowlist, host or IP filtering,
 or protection against link-local, loopback, or RFC-1918 addresses. Location: redirects were followed
 recursively back into the same function, which also serviced file:// URIs, so a single attacker-controlled
 HTTP redirect could upgrade the bug from SSRF to arbitrary local file disclosure. Any consumer of
 css_parser that hands it attacker-influenced CSS together with a base_uri: option is exposed. This issue
 is fixed in version 3.0.0. (CVE-2026-53727)

Solution

Update the css_parser library and its related packages to version 3.0.0 or later.

See Also

https://github.com/advisories/GHSA-9pmc-p236-855h

Plugin Details

Severity: High

ID: 444563

Version: Revision 1.3

Type: Local

Family: SCA Checks

Published: 7/9/2026

Updated: 7/20/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.77

Vendor

Vendor Severity: High

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-2026-53727

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS v4

Risk Factor: High

Base Score: 8.9

Threat Score: 6.3

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 7/9/2026

Vulnerability Publication Date: 7/9/2026

Reference Information

CVE: CVE-2026-53727

cwe: CWE-918