CVE-2017-18926

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-11-06 · updated 2026-06-17
Weakness: CWE-787

Description

raptor_xml_writer_start_element_common in raptor_xml_writer.c in Raptor RDF Syntax Library 2.0.15 miscalculates the maximum nspace declarations for the XML writer, leading to heap-based buffer overflows (sometimes seen in raptor_qname_format_as_xml).

Affected products

Debian Linux: 9.0, 10.0
Fedoraproject Fedora: 31, 32, 33
librdf Raptor RDF Syntax Library: 2.0.15

References

http://www.openwall.com/lists/oss-security/2020/11/13/1
http://www.openwall.com/lists/oss-security/2020/11/13/2
http://www.openwall.com/lists/oss-security/2020/11/14/2
http://www.openwall.com/lists/oss-security/2020/11/16/2
http://www.openwall.com/lists/oss-security/2020/11/16/3
https://github.com/LibreOffice/core/blob/master/external/redland/raptor/0001-Calcualte-max-nspace-declarations-correctly-for-XML-.patch.1
https://lists.debian.org/debian-lts-announce/2020/11/msg00012.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RD67AVORGQXORPWNYYUHCH6YPPT6CI4O/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RVHFYQDMVEBICIL4DBAGRRLPUR4QYWMV/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDZRNM45VPTQF2BKRWG4YRCHJGQ2L7NS/
https://www.debian.org/security/2020/dsa-4785
https://www.openwall.com/lists/oss-security/2017/06/07/1

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