An issue was discovered in lxml before 4.2.5.
Priority LOW 32CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Partial Red Hat: 11 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-79.
Summary
An issue was discovered in lxml before 4.2.5. lxml/html/clean.py in the lxml.html.clean module does not remove javascript: URLs that use escaping, allowing a remote attacker to conduct XSS attacks, as demonstrated by "j a v a s c r i p t:" in Internet Explorer. This is a similar issue to CVE-2014-3146.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02438 84th percentileScored 2026-11-07
Fix Partial lxml (PyPI): 4.2.5Red Hat: 11 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | lxml (PyPI) | before 4.2.5 | 4.2.5 | Patch available | GHSA-xp26-p53h-6h2p |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- lxml (PyPI) Vendor— Affected before 4.2.5 Fixed in 4.2.5 Patch available GHSA-xp26-p53h-6h2p
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:lxml:lxml:*:*:*:*:*:*:*:* | before 4.2.5 | Vulnerable | lxml |
| cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Debian |
| cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:* | 12.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* | 14.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* | 16.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | 18.04 | Vulnerable | Canonical |
- cpe:2.3:a:lxml:lxml:*:*:*:*:*:*:*:* Versions before 4.2.5 Vulnerable ·lxml
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
- cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:* Versions 12.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
Remediation
- Fix · GHSA-xp26-p53h-6h2p lxml (PyPI) Fixed in 4.2.5 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 10 (Newton) | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 12 (Pike) | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 13 (Queens) | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 14 (Rocky) | Affected | No fix yet |
| Red Hat OpenStack Platform 8 (Liberty) | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 9 (Mitaka) | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2018-19787
- 2026-10-03 Alias added: GHSA-xp26-p53h-6h2p
References
Advisory 5
Sources
- CVE-2018-19787 · CVE Program
- CVE-2018-19787 · NVD
- FIRST EPSS
- GHSA-xp26-p53h-6h2p · GitHub Advisory Database · CC BY 4.0
- CVE-2018-19787 · Red Hat security data · CC BY 4.0
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