Is this vulnerability remotely exploitable?

Yes, if an attacker can cause WeasyPrint to fetch URLs based on externally supplied input (for example, through user-supplied HTML or parameters passed into the PDF generation process). In that scenario, the attacker can set up redirect chains that reach internal resources.

What level of access does an attacker need to exploit this issue?

The attacker typically needs only the ability to influence or specify URLs that WeasyPrint will fetch, not shell or filesystem access. They do not need direct network access to the internal services; instead, they abuse the server's network position via SSRF.

What is the most robust fix pattern conceptually?

The safest pattern is to enforce SSRF validation on the final, post-redirect URL and to tightly restrict where WeasyPrint is allowed to connect. This often means disabling implicit redirects for untrusted URLs or intercepting every redirect step to reapply strict allowlist/denylist checks on the effective destination.

Severity:

HIGH RISK

(7.5)

SSRF via Open Redirect and Redirect Handling (CWE-918, CWE-601) in WeasyPrint default_url_fetcher

CVE-2025-68616

Published:

Jan 19, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-601;CWE-918

Impact:

Unauthorized access to internal network resources via SSRF

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-601;CWE-918

Impact:

Unauthorized access to internal network resources via SSRF

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

SSRF via Open Redirect and Redirect Handling (CWE-918, CWE-601) in WeasyPrint default_url_fetcher

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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