CVE-2026-44312
medium
CVSS v3
5.8
CVSS v4 NEW
—
VIR risk
5.8
Description
CSS Parser: Improper Certificate Validation allows MITM injection of remote CSS content
Predictions
Exploit likelihood
68%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | fixed | 2.1.0-1 |
| debian | sid | fixed | 2.1.0-1 |
| debian | trixie | affected | |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| RubyGems | css_parser | <~> 1.22.0 | ~> 1.22.0 |
| RubyGems | css_parser | >=2.0.0,<2.1.0 | 2.1.0 |
| RubyGems | css_parser | <1.22.0 | 1.22.0 |
| RUBYGEMS | css_parser | < 1.22.0 | 1.22.0 |
| RUBYGEMS | css_parser | >= 2.0.0, < 2.1.0 | 2.1.0 |
References
- https://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc
- https://github.com/premailer/css_parser/commit/35e689c904225add78e0c488cf04bad052666449
- https://github.com/premailer/css_parser/commit/e0c95d5abe91b237becb90ff316531a6547ada18
- https://github.com/premailer/css_parser/issues/185
- https://nvd.nist.gov/vuln/detail/CVE-2026-44312
- https://github.com/premailer/css_parser
- https://security-tracker.debian.org/tracker/CVE-2026-44312
- https://github.com/advisories/GHSA-ff6c-w6qf-7xqc
CWEs
CWE-295 CWE-829
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.