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CVE-2025-27516

CVE-2025-27516 · Jinja sandbox breakout through attr filter selecting format method

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Jinja is an extensible templating engine. Prior to 3.1.6, 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. This vulnerability is fixed in 3.1.6.

CVSS 5.4 · Medium · EPSS 0.5% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • jinja

    Versions
    • < 3.1.6: Affected

    No fix published

  • jinja2 Debian:12

    Versions
    • 3.1.2-1
    • 3.1.2-1+deb12u1
    • 3.1.2-1+deb12u2
    Affected ranges
    • ECOSYSTEM: < 3.1.2-1+deb12u3

    Update to 3.1.2-1+deb12u3

  • jinja2 Debian:13

    Affected ranges
    • ECOSYSTEM: < 3.1.6-1

    Update to 3.1.6-1

  • jinja2 Debian:14

    Affected ranges
    • ECOSYSTEM: < 3.1.6-1

    Update to 3.1.6-1

  • jinja2 PyPI

    Versions
    • 2.0
    • 2.0rc1
    • 2.1
    • 2.1.1
    • 2.10
    • 2.10.1
    • 2.10.2
    • 2.10.3
    • 2.11.0
    • 2.11.1
    • 2.11.2
    • 2.11.3
    • 2.2
    • 2.2.1
    • 2.3
    • 2.3.1
    • 2.4
    • 2.4.1
    • 2.5
    • 2.5.1
    • 2.5.2
    • 2.5.3
    • 2.5.4
    • 2.5.5
    • 2.6
    • 2.7
    • 2.7.1
    • 2.7.2
    • 2.7.3
    • 2.8
    • 2.8.1
    • 2.9
    • 2.9.1
    • 2.9.2
    • 2.9.3
    • 2.9.4
    • 2.9.5
    • 2.9.6
    • 3.0.0
    • 3.0.0a1
    • 3.0.0rc1
    • 3.0.0rc2
    • 3.0.1
    • 3.0.2
    • 3.0.3
    • 3.1.0
    • 3.1.1
    • 3.1.2
    • 3.1.3
    • 3.1.4
    • 3.1.5
    Affected ranges
    • ECOSYSTEM: < 3.1.6

    Update to 3.1.6

  • jinja2 Ubuntu:Pro:14.04:LTS

    Versions
    • 2.7-3
    • 2.7.1-1
    • 2.7.2-1
    • 2.7.2-2
    • 2.7.2-2ubuntu0.1~esm1
    • 2.7.2-2ubuntu0.1~esm2
    • 2.7.2-2ubuntu0.1~esm3
    • 2.7.2-2ubuntu0.1~esm4
    Affected ranges
    • ECOSYSTEM: < 2.7.2-2ubuntu0.1~esm6

    Update to 2.7.2-2ubuntu0.1~esm6

  • jinja2 Ubuntu:Pro:16.04:LTS

    Versions
    • 2.8-1
    • 2.8-1ubuntu0.1
    • 2.8-1ubuntu0.1+esm1
    • 2.8-1ubuntu0.1+esm2
    • 2.8-1ubuntu0.1+esm3
    Affected ranges
    • ECOSYSTEM: < 2.8-1ubuntu0.1+esm5

    Update to 2.8-1ubuntu0.1+esm5

  • jinja2 Ubuntu:Pro:18.04:LTS

    Versions
    • 2.9.6-1
    • 2.10-1
    • 2.10-1ubuntu0.18.04.1
    • 2.10-1ubuntu0.18.04.1+esm1
    • 2.10-1ubuntu0.18.04.1+esm2
    • 2.10-1ubuntu0.18.04.1+esm3
    Affected ranges
    • ECOSYSTEM: < 2.10-1ubuntu0.18.04.1+esm4

    Update to 2.10-1ubuntu0.18.04.1+esm4

  • jinja2 Ubuntu:20.04:LTS

    Versions
    • 2.10-2ubuntu1
    • 2.10-2ubuntu2
    • 2.10.1-1ubuntu1
    • 2.10.1-2
    • 2.10.1-2ubuntu0.2
    • 2.10.1-2ubuntu0.3
    • 2.10.1-2ubuntu0.4
    Affected ranges
    • ECOSYSTEM: < 2.10.1-2ubuntu0.5

    Update to 2.10.1-2ubuntu0.5

  • jinja2 Ubuntu:22.04:LTS

    Versions
    • 2.11.3-1
    • 3.0.1-2
    • 3.0.3-1
    • 3.0.3-1ubuntu0.1
    • 3.0.3-1ubuntu0.2
    • 3.0.3-1ubuntu0.3
    Affected ranges
    • ECOSYSTEM: < 3.0.3-1ubuntu0.4

    Update to 3.0.3-1ubuntu0.4

  • jinja2 Ubuntu:24.04:LTS

    Versions
    • 3.1.2-1
    • 3.1.2-1ubuntu1
    • 3.1.2-1ubuntu1.1
    • 3.1.2-1ubuntu1.2
    Affected ranges
    • ECOSYSTEM: < 3.1.2-1ubuntu1.3

    Update to 3.1.2-1ubuntu1.3

Original sources

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