CVE-2019-10906 — In Pallets Jinja before 2

In Pallets Jinja before 2.10.1, str.format_map allows a sandbox escape.

01What is this vulnerability?

In Pallets Jinja before 2.10.1, str.format_map allows a sandbox escape.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-04-06T23:17:03.000Z
• Last modified: 2024-08-04T22:40:15.214Z

09References

• palletsprojects.com — https://palletsprojects.com/blog/jinja-2-10-1-released
• lists.apache.org — https://lists.apache.org/thread.html/46c055e173b52d599c648a98199972dbd6a89d2b4c4…
• lists.apache.org — https://lists.apache.org/thread.html/b2380d147b508bbcb90d2cad443c159e63e12555966…
• lists.apache.org — https://lists.apache.org/thread.html/f0c4a03418bcfe70c539c5dbaf99c04c98da13bfa1d…
• lists.apache.org — https://lists.apache.org/thread.html/57673a78c4d5c870d3f21465c7e2946b9f8285c7c57…
• lists.apache.org — https://lists.apache.org/thread.html/320441dccbd9a545320f5f07306d711d4bbd31ba43d…
• lists.apache.org — https://lists.apache.org/thread.html/2b52b9c8b9d6366a4f1b407a8bde6af28d9fc73fdb3…
• lists.apache.org — https://lists.apache.org/thread.html/7f39f01392d320dfb48e4901db68daeece62fd60ef2…
• lists.apache.org — https://lists.apache.org/thread.html/09fc842ff444cd43d9d4c510756fec625ef8eb1175f…
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• access.redhat.com — https://access.redhat.com/errata/RHSA-2019:1152
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00030.html
• access.redhat.com — https://access.redhat.com/errata/RHSA-2019:1237
• access.redhat.com — https://access.redhat.com/errata/RHSA-2019:1329
• usn.ubuntu.com — https://usn.ubuntu.com/4011-1/
• usn.ubuntu.com — https://usn.ubuntu.com/4011-2/
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00064.html