---
id: CVE-2024-34064
aliases:
  - GHSA-h75v-3vvj-5mfj
  - PYSEC-2026-1474
title: >-
  Jinja vulnerable to HTML attribute injection when passing user input as keys
  to xmlattr filter
summary: >-
  Jinja vulnerable to HTML attribute injection when passing user input as keys
  to xmlattr filter
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N'
vendor: jinja2
product: jinja2
ecosystem: pip
affected:
  - jinja2 < 3.1.4
patched:
  - jinja2 3.1.4
published: '2024-05-06'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:13.786450101Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-h75v-3vvj-5mfj'
references:
  - url: 'https://github.com/pallets/jinja/security/advisories/GHSA-h75v-3vvj-5mfj'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2024-34064'
  - url: >-
      https://github.com/pallets/jinja/commit/0668239dc6b44ef38e7a6c9f91f312fd4ca581cb
  - url: 'https://github.com/pallets/jinja'
  - url: 'https://lists.debian.org/debian-lts-announce/2024/12/msg00009.html'
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/567XIGSZMABG6TSMYWD7MIYNJSUQQRUC
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCLF44KY43BSVMTE6S53B4V5WP3FRRSE
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SSCBHIL6BYKR5NRCBXP4XMP2CEEKGFVS
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZALNWE3TXPPHVPSI3AZ5CTMSTAVN5UMS
tags:
  - osv
  - pip
  - exploit-available
epss: 0.00979
epssPercentile: 0.6072
exploits:
  github: 7
  githubRepos:
    - 'https://github.com/SandBlastx/flask-vuln-v3'
    - 'https://github.com/SandBlastx/flask-vuln-v4'
    - 'https://github.com/SandBlastx/flask-vuln-baseline'
  checkedAt: '2026-09-24T07:52:51.437Z'
exploitAvailable: true
ingestedAt: '2026-07-08T18:25:50.009Z'
---

## Overview

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 packages

- `jinja2 < 3.1.4`

## Remediation

Upgrade to a patched release:

- `jinja2 3.1.4`