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CVE Vulnerability Details :
CVE-2026-53727
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-17 Jul, 2026 | 20:30
Updated At-20 Jul, 2026 | 13:48
Rejected At-
▼CVE Numbering Authority (CNA)
css_parser: SSRF and Local File Disclosure in `CssParser::Parser#read_remote_file`

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.

Affected Products
Vendor
premailer
Product
css_parser
Versions
Affected
  • < 3.0.0
Problem Types
TypeCWE IDDescription
CWECWE-918CWE-918: Server-Side Request Forgery (SSRF)
Type: CWE
CWE ID: CWE-918
Description: CWE-918: Server-Side Request Forgery (SSRF)
Metrics
VersionBase scoreBase severityVector
4.08.9HIGH
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
Version: 4.0
Base score: 8.9
Base severity: HIGH
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855h
x_refsource_CONFIRM
https://github.com/premailer/css_parser/commit/7d2ddf0189cd54b54f378f59daefa10cb036e476
x_refsource_MISC
https://github.com/premailer/css_parser/commit/e0a151458b2a801ae265ba420862ef8b1127b3ae
x_refsource_MISC
https://github.com/premailer/css_parser/releases/tag/v3.0.0
x_refsource_MISC
Hyperlink: https://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855h
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/premailer/css_parser/commit/7d2ddf0189cd54b54f378f59daefa10cb036e476
Resource:
x_refsource_MISC
Hyperlink: https://github.com/premailer/css_parser/commit/e0a151458b2a801ae265ba420862ef8b1127b3ae
Resource:
x_refsource_MISC
Hyperlink: https://github.com/premailer/css_parser/releases/tag/v3.0.0
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855h
exploit
Hyperlink: https://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855h
Resource:
exploit
Details not found