← Back
CVE-2026-44312
medium
CVSS 5.8
Vulnerability in css_parser (CVE-2026-44312)
Summary
vulnerability in css_parser (CVE-2026-44312). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `1.22.0` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-44312** has been found in css_parser.
Risk of unauthorized operations or information disclosure. CVSS score: 5.8/10.
What to do: upgrade css_parser to **1.22.0** or later.
If unsure, ask your IT team or search "css_parser CVE-2026-44312" on the vendor's site.
CVE-2026-44312 (css_parser) — CWE-295 / CVSS v3 5.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `1.22.0` — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**A vulnerability** (CWE-295) exists in css_parser.
📍 Affected scope
css_parser — .
🔥 Severity
Severity: Medium (CVSS 5.8/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.22.0**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'css_parser' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'css_parser' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `css_parser` を grep し、稼働しているサービス・バージョンを把握する。
-
6Apply patch patch
Upgrade css_parser to 1.22.0ステージング環境で 1.22.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。
-
7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
RubyGems
css_parser
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.22.0"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-44312
- package https://github.com/premailer/css_parser
- web https://github.com/premailer/css_parser/security/advisories/GHSA-ff6c-w6qf-7xqc
- web https://github.com/premailer/css_parser/issues/185
- web https://github.com/premailer/css_parser/commit/35e689c904225add78e0c488cf04bad052666449
- web https://github.com/premailer/css_parser/commit/e0c95d5abe91b237becb90ff316531a6547ada18
- web https://github.com/advisories/GHSA-ff6c-w6qf-7xqc
- web https://github.com/rubysec/ruby-advisory-db/blob/master/gems/css_parser/CVE-2026-44312.yml