Is there a public exploit for CVE-2024-34064?

Yes. Proof-of-concept code for CVE-2024-34064 has been published publicly.

Is there a proof of concept for CVE-2024-34064?

Yes — 7 proof-of-concept entries are linked on this page, from public repositories and community submissions. They are listed for authorised testing only.

How severe is CVE-2024-34064?

CVE-2024-34064 scores CVSS 5.4 (v3.1), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.98%.

What does CVE-2024-34064 affect?

CVE-2024-34064 affects pallets Jinja2.

5.4 Medium

Jinja is an extensible templating engine.

CVE-2024-34064

Jinja is an extensible templating engine. The xmlattr filter in affected versions of Jinja accepts keys containing non-attribute characters. XML/HTML attributes cannot contain spaces, /, >, or =, as each would then be interpreted as starting a separate attribute. If an application accepts keys (as opposed to only values) as user input, and renders these in pages that other users see as well, an attacker could use this to inject other attributes and perform XSS. The fix for CVE-2024-22195 only addressed spaces but not other characters. Accepting keys as user input is now explicitly considered an unintended use case of the xmlattr filter, and code that does so without otherwise validating the input should be flagged as insecure, regardless of Jinja version. Accepting values as user input continues to be safe. This vulnerability is fixed in 3.1.4.

Proof-of-concept code is published

Public PoC

Public PoCSandBlastx/flask-vuln-v3
Public PoCSandBlastx/flask-vuln-v4
Public PoCSandBlastx/flask-vuln-baseline
Public PoCSandBlastx/flask-vuln-v1
Public PoCSandBlastx/flask-vuln-v2
Public PoCSandBlastx/flask-vuln-v5
Public PoCSandBlastx/flask-vuln-v6

Signals come from Exploit-DB, Metasploit, Nuclei and published proof-of-concept repositories. Their absence means nothing was found, not that nothing exists.

Assessment

CVSS: 5.4 (v3.1)
Severity: Medium
EPSS: 0.98% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Public PoC
Published: 6 May 2024
Last updated: 17 June 2026
Affected: pallets · jinja · Jinja2
Weakness: CWE-79
Assigner: security-advisories@github.com

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

At the source

References

Community proofs of concept

No community proof of concept yet. If you have one for a published vulnerability and the right to share it, add it below — it will appear here once reviewed.

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