CVE-2019-9658 — Checkstyle before 8

Checkstyle before 8.18 loads external DTDs by default.

01What is this vulnerability?

Checkstyle before 8.18 loads external DTDs by default.

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: 2019-03-11T04:00:00.000Z
• Last modified: 2024-08-04T21:54:45.129Z

09References

• github.com — https://github.com/checkstyle/checkstyle/pull/6476
• github.com — https://github.com/checkstyle/checkstyle/issues/6474
• github.com — https://github.com/checkstyle/checkstyle/issues/6478
• checkstyle.org — https://checkstyle.org/releasenotes.html#Release_8.18
• lists.apache.org — https://lists.apache.org/thread.html/7eea10e7be4c21060cb1e79f6524c6e6559ba833b14…
• 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.debian.org — https://lists.debian.org/debian-lts-announce/2019/04/msg00029.html
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• lists.apache.org — https://lists.apache.org/thread.html/a35a8ccb316d4c2340710f610cba8058e87d5376259…
• lists.apache.org — https://lists.apache.org/thread.html/fff26ee7b59360a0264fef4e8ed9454ef652db2c39f…
• lists.apache.org — https://lists.apache.org/thread.html/6bf8bbbca826e883f09ba40bc0d319350e1d6d4cf4d…
• lists.apache.org — https://lists.apache.org/thread.html/994221405e940e148adcfd9cb24ffc6700bed70c782…
• lists.apache.org — https://lists.apache.org/thread.html/rda99599896c3667f2cc9e9d34c7b6ef5d2bbed1f48…