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CRITICAL severity

CVE-2020-10799 — svglib

CRITICALFix: deeplook/svglib@35686a1

CVE-2020-10799 is a critical-severity (CVSS 9.8) XML External Entity (XXE) vulnerability in svglib. 1 public exploit reference exists, so weaponization risk is real. A fix is available for svglib — see the affected versions and patch details below.

SVGlib Vulnerable to XXE Attacks

Also known asGHSA-3vcg-8p79-jpcvPYSEC-2020-111
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs74th percentile — riskier than 74% of all scored CVEsHighest risk
0.00%0.68%1.35%2.03%0.3%1.5%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2020-10799 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐍svglib

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

The svglib package through 0.9.3 for Python allows XXE attacks via an svg2rlg call.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIsvgliball versions0.9.4pip install --upgrade 'svglib==0.9.4'

Affected Products

1 product · 1 configurations
Application
svglibsvglib_project
≤ 0.9.3
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

The svglib package through 0.9.3 for Python allows XXE attacks via an sv…

github.comNVDMar 2020

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for svglib, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update svglib to 0.9.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-10799 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

The svglib package through 0.9.3 for Python allows XXE attacks via an svg2rlg call.
O3 Security · Impact-Aware SCA

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CVE-2020-10799: svglib XXE — Fixed in 0.9.4