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MEDIUM severity

CVE-2020-28463 — reportlab

MEDIUM

CVE-2020-28463 is a medium-severity (CVSS 6.5) Server-Side Request Forgery (SSRF) vulnerability in reportlab. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for reportlab — see the affected versions and patch details below.

Server-side Request Forgery (SSRF) via img tags in reportlab

Also known asGHSA-mpvw-25mg-59vxPYSEC-2021-146SNYK-PYTHON-REPORTLAB-1022145
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs71th percentile — riskier than 71% of all scored CVEsHighest risk
0.21%0.80%1.40%1.99%0.7%1.3%May 26Sep 26Nov 26

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

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍reportlab

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

All versions of package reportlab at time of writing are vulnerable to Server-side Request Forgery (SSRF) via img tags. In order to reduce risk, use trustedSchemes & trustedHosts (see in Reportlab's documentation)

Steps to reproduce by Karan Bamal:

  1. Download and install the latest package of reportlab
  2. Go to demos -> odyssey -> dodyssey
  3. In the text file odyssey.txt that needs to be converted to pdf inject <img src="http://127.0.0.1:5000" valign="top"/>
  4. Create a nc listener nc -lp 5000
  5. Run python3 dodyssey.py
  6. You will get a hit on your nc showing we have successfully proceded to send a server side request
  7. dodyssey.py will show error since there is no img file on the url, but we are able to do SSRF

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIreportlaball versions3.5.55pip install --upgrade 'reportlab==3.5.55'

Affected Products

2 products · 3 configurations
OS
fedorafedoraproject
2 versions
3435
Application
reportlabreportlab
all
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.

All versions of package reportlab are vulnerable to Server-side Request …

snyk.ioNVDNov 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update reportlab to 3.5.55 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-28463 is resolved across your whole dependency graph.

  3. Workarounds

    Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.

Frequently Asked Questions

All versions of package reportlab at time of writing are vulnerable to Server-side Request Forgery (SSRF) via img tags. In order to reduce risk, use trustedSchemes & trustedHosts (see in Reportlab's documentation) Steps to reproduce by Karan Bamal: 1. Download and install the latest package of reportlab 2. Go to demos -> odyssey -> dodyssey 3. In the text file odyssey.txt that needs to be converted to pdf inject `<img src="http://127.0.0.1:5000" valign="top"/>` 4. Create a nc listener `nc -lp 5000` 5. Run python3 dodyssey.py 6. You will get a hit on your nc showing we have successfully p
O3 Security · Impact-Aware SCA

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CVE-2020-28463: reportlab SSRF — Fixed in 3.5.55