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FedoraOperating system · Fedoraproject

CVE-2024-34064

MEDIUM · 5.4 CVSS v3.1 Published 2024-05-06
Fix available
A fix is available. Upgrade to 3.1.4 or later.
See remediation →
61/100
Remediation priority · Elevated
Remotely reachable No privileges Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-79

Untrusted input is placed into a web page without being neutralised, so an attacker's markup or script executes in another user's browser. That can hijack sessions, capture keystrokes, or silently perform actions as the victim. Fixing it properly means context-aware output encoding everywhere data meets HTML, backed by a content-security policy as a second line of defence.

General guidance for the cross-site scripting (xss) class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
FedoraOperating system
Affected:= 39= 40
JinjaApplication
Affected:< 3.1.4

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 3.1.4 or later
Fixed in 3.1.4
Vendor patch github.com →
Recommended fix High confidence

Jinja 3.1.4 or later

  1. Identify the Python package manager used in your project (pip, pipenv, conda, etc.)
  2. Run the appropriate upgrade command: pip install 'Jinja2>=3.1.4' or pip install --upgrade Jinja2
  3. Verify the installed version matches or exceeds 3.1.4 by running: pip show jinja2
  4. If using a dependency lock file (requirements.txt, Pipfile, setup.py), update the Jinja2 version constraint to '>=3.1.4' and regenerate the lock file
  5. If using Fedora packages, update via: dnf update python-jinja2 or dnf upgrade python-jinja2
  6. After upgrading, test that your application renders templates correctly, particularly any templates using the xmlattr filter
Caveat None expected - this is a security fix; the xmlattr filter behavior change only affects misuse (accepting untrusted keys as user input), which was never intended use

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-34064 in production — separate from our analysis above.

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What belongs here
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  • Version or environment caveats, and links to real fixes
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