CVE-2023-27476 — OWSLib is a Python package for client programming with Open Geospatial Consortiu

OWSLib is a Python package for client programming with Open Geospatial Consortium (OGC) web service interface standards, and their related content models. OWSLib's XML parser (which supports both `lxml` and `xml.etree`) does not disable entity resolution, and could lead to a

01What is this vulnerability?

OWSLib is a Python package for client programming with Open Geospatial Consortium (OGC) web service interface standards, and their related content models. OWSLib's XML parser (which supports both `lxml` and `xml.etree`) does not disable entity resolution, and could lead to arbitrary file reads from an attacker-controlled XML payload. This affects all XML parsing in the codebase. This issue has…

02Affected products

Vendor	Product	Versions
geopython	OWSLib	< 0.28.1

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: 2023-03-07T23:20:32.878Z
• Last modified: 2025-02-25T15:00:10.207Z

09References

• github.com — https://github.com/geopython/OWSLib/security/advisories/GHSA-8h9c-r582-mggc
• github.com — https://github.com/geopython/OWSLib/pull/863/commits/b92687702be9576c0681bb11cad…
• securitylab.github.com — https://securitylab.github.com/advisories/GHSL-2022-131_owslib/
• www.debian.org — https://www.debian.org/security/2023/dsa-5426
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2023/06/msg00032.html