Vulnerability in Pallets Jinja
CVE-2024-56326
Jinja is an extensible templating engine. Prior to 3.1.5, 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. This vulnerability is fixed in 3.1.5.
EPSS: 0.005 (41.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Pallets Jinja — versions < 3.1.5
- Palletsprojects Jinja
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2024-56326?
- CVE-2024-56326 is a high-severity vulnerability in Pallets Jinja, classified under Protection Mechanism Failure. CVSS score: 7.8/10. Published 2024-12-23.
- How severe is CVE-2024-56326?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2024-56326 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.