Update dependency jinja2 to v3.1.6 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
jinja2 (changelog)	==3.1.3 -> ==3.1.6

GitHub Vulnerability Alerts

CVE-2024-34064

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.

CVE-2024-56326

An oversight in how the Jinja sandboxed environment detects calls to str.format allows an attacker that controls the content of a template to execute arbitrary Python code.

To exploit the vulnerability, an attacker needs to control the content of a template. Whether that is the case depends on the type of application using Jinja. This vulnerability impacts users of applications which execute untrusted templates.

Jinja's sandbox does catch calls to str.format and ensures they don't escape the sandbox. However, it's possible to store a reference to a malicious string's format method, then pass that to a filter that calls it. No such filters are built-in to Jinja, but could be present through custom filters in an application. After the fix, such indirect calls are also handled by the sandbox.

CVE-2024-56201

A bug in the Jinja compiler allows an attacker that controls both the content and filename of a template to execute arbitrary Python code, regardless of if Jinja's sandbox is used.

To exploit the vulnerability, an attacker needs to control both the filename and the contents of a template. Whether that is the case depends on the type of application using Jinja. This vulnerability impacts users of applications which execute untrusted templates where the template author can also choose the template filename.

CVE-2025-27516

An oversight in how the Jinja sandboxed environment interacts with the |attr filter allows an attacker that controls the content of a template to execute arbitrary Python code.

To exploit the vulnerability, an attacker needs to control the content of a template. Whether that is the case depends on the type of application using Jinja. This vulnerability impacts users of applications which execute untrusted templates.

Jinja's sandbox does catch calls to str.format and ensures they don't escape the sandbox. However, it's possible to use the |attr filter to get a reference to a string's plain format method, bypassing the sandbox. After the fix, the |attr filter no longer bypasses the environment's attribute lookup.

---

Release Notes

pallets/jinja (jinja2)

v3.1.6

Compare Source

Released 2025-03-05

• The |attr filter does not bypass the environment's attribute lookup,
  allowing the sandbox to apply its checks. :ghsa:cpwx-vrp4-4pq7

v3.1.5

Compare Source

Released 2024-12-21

• The sandboxed environment handles indirect calls to str.format, such as
  by passing a stored reference to a filter that calls its argument.
  :ghsa:q2x7-8rv6-6q7h
• Escape template name before formatting it into error messages, to avoid
  issues with names that contain f-string syntax.
  :issue:1792, :ghsa:gmj6-6f8f-6699
• Sandbox does not allow clear and pop on known mutable sequence
  types. :issue:2032
• Calling sync render for an async template uses asyncio.run.
  :pr:1952
• Avoid unclosed auto_aiter warnings. :pr:1960
• Return an aclose-able AsyncGenerator from
  Template.generate_async. :pr:1960
• Avoid leaving root_render_func() unclosed in
  Template.generate_async. :pr:1960
• Avoid leaving async generators unclosed in blocks, includes and extends.
  :pr:1960
• The runtime uses the correct concat function for the current environment
  when calling block references. :issue:1701
• Make |unique async-aware, allowing it to be used after another
  async-aware filter. :issue:1781
• |int filter handles OverflowError from scientific notation.
  :issue:1921
• Make compiling deterministic for tuple unpacking in a {% set ... %}
  call. :issue:2021
• Fix dunder protocol (copy/pickle/etc) interaction with Undefined
  objects. :issue:2025
• Fix copy/pickle support for the internal missing object.
  :issue:2027
• Environment.overlay(enable_async) is applied correctly. :pr:2061
• The error message from FileSystemLoader includes the paths that were
  searched. :issue:1661
• PackageLoader shows a clearer error message when the package does not
  contain the templates directory. :issue:1705
• Improve annotations for methods returning copies. :pr:1880
• urlize does not add mailto: to values like @a@b. :pr:1870
• Tests decorated with @pass_context`` can be used with the ``|select`` filter. :issue:1624`
• Using set for multiple assignment (a, b = 1, 2) does not fail when the
  target is a namespace attribute. :issue:1413
• Using set in all branches of {% if %}{% elif %}{% else %} blocks
  does not cause the variable to be considered initially undefined.
  :issue:1253

v3.1.4

Compare Source

Released 2024-05-05

• The xmlattr filter does not allow keys with / solidus, >
  greater-than sign, or = equals sign, in addition to disallowing spaces.
  Regardless of any validation done by Jinja, user input should never be used
  as keys to this filter, or must be separately validated first.
  :ghsa:h75v-3vvj-5mfj

---

Configuration

📅 Schedule: Branch creation - "" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.