Jinja vulnerable to HTML attribute injection when passing user input as keys to xmlattr filter
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 the previous GHSA-h5c8-rqwp-cp95 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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | jinja2 | < 3.1.4 | 3.1.4 |
References
- https://github.com/pallets/jinja/security/advisories/GHSA-h75v-3vvj-5mfj
- https://nvd.nist.gov/vuln/detail/CVE-2024-34064
- https://github.com/pallets/jinja/commit/0668239dc6b44ef38e7a6c9f91f312fd4ca581cb
- https://github.com/pallets/jinja
- https://lists.debian.org/debian-lts-announce/2024/12/msg00009.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/567XIGSZMABG6TSMYWD7MIYNJSUQQRUC
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCLF44KY43BSVMTE6S53B4V5WP3FRRSE
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SSCBHIL6BYKR5NRCBXP4XMP2CEEKGFVS
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZALNWE3TXPPHVPSI3AZ5CTMSTAVN5UMS
- https://pypi.org/project/jinja2
- https://github.com/advisories/GHSA-h75v-3vvj-5mfj
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Python (PyPI)
- Package
jinja2- Disclosed
- 06.05.2024
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1474 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-h75v-3vvj-5mfj - CC BY 4.0
Vulnerability history: jinja2
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 11
- First → latest
- 05.2014 06.2025
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 4
- Medium 7
Disclosures per year
- 2017: 0
- 2018: 0
- 2019: 2
- 2020: 0
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 4
- 2025: 2
- 2026: 0
earlier: 2
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Jinja vulnerable to HTML attribute injection when passing user input as keys to xmlattr filter this entry
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