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Fencer Vulns
high 7.1

CVE-2017-18926 json

raptor_xml_writer_start_element_common in raptor_xml_writer.c in Raptor RDF Syntax Library 2.0.15 miscalculates the maximum nspace declarat…

published 2020-11-06 6 y ago modified 2026-06-17 4 mo ago also EUVD-2017-10015

cvss
7.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.0%
EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

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).

Patch / fix

  • raptor2 Debian 14, Debian 13, Debian 12 2.0.14-1.1

debian advisories DEBIAN-CVE-2017-18926

  • raptor2 Ubuntu 16.04 LTS 2.0.14-1ubuntu0.16.04.1
  • raptor2 Ubuntu 18.04 LTS 2.0.14-1ubuntu0.18.04.1
  • raptor2 Ubuntu 20.04 LTS 2.0.15-0ubuntu1.20.04.1
  • raptor2 Ubuntu 22.04 LTS 2.0.15-0ubuntu2
  • raptor Ubuntu Pro 16.04 LTS 1.4.21-11ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2017-18926

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • raptor2 RHEL 8 2.0.15-16.el8

red hat advisories RHSA-2021:1842

  • raptor SLE Module for Desktop Applications 15 SP2 2.0.15-9.3.1
  • raptor SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +16 more 2.0.15-5.3.1
  • raptor SLE Module for Desktop Applications 15 SP1 2.0.15-3.3.1

suse advisories SUSE-SU-2020:3352-1SUSE-SU-2020:3351-1SUSE-SU-2020:3350-1

  • raptor openSUSE Leap 15.1 2.0.15-lp151.3.3.1
  • raptor openSUSE Leap 15.2 2.0.15-lp152.4.3.1

opensuse advisories openSUSE-SU-2020:1959-1openSUSE-SU-2020:1949-1

  • raptor2 AlmaLinux 8 2.0.15-16.el8

almalinux advisories ALSA-2021:1842

  • raptor2 Rocky Linux 8 2.0.15-16.el8

rocky linux advisories RLSA-2021:1842

  • raptor2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 2.0.15-r2

alpine advisories ALPINE-CVE-2017-18926

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • raptor Arch Linux 2.0.15-14

arch linux advisories AVG-1283

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-18926 updated cvss 7.1

raptor: heap-based buffer overflows due to an error in calculating the maximum nspace declarations for the XML writer

  • Red Hat Enterprise Linux 6 raptor, autocorr-af, autocorr-bg, autocorr-ca, autocorr-cs, autocorr-da, +61 more Red Hat Enterprise Linux 7 raptor2, autocorr-af, autocorr-bg, autocorr-ca, autocorr-cs, autocorr-da, +106 more
    affected: no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) raptor2 2.0.15-16.el8 Red Hat Enterprise Linux AppStream (v. 8) raptor2 2.0.15-16.el8
    fixed: vendor fix RHSA-2021:1842
  • Red Hat Enterprise Linux 8 autocorr-af, autocorr-bg, autocorr-ca, autocorr-cs, autocorr-da, autocorr-de, +98 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.99% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • openwall.com https://www.openwall.com/lists/oss-security/2017/06/07/1 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:N/I:P/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.