CVE-2017-18926

Exp

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).

Published: 2020-11-06 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-18926 is rated High Exploit Risk (71.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.77%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2017-18926

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2017-18926

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-30 2.91% 1.77% -1.14%
2 2026-04-09 2.76% 2.91% +0.15%
3 2026-03-02 — 2.76% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-18926

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 4.2 [email protected]
5.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 4.9 [email protected]

Weakness enumeration for CVE-2017-18926

OS Trackers for CVE-2017-18926

vendor priority summary link
alpine — CVE-2017-18926: 1 source package rows (raptor2); 7 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 0. https://security.alpinelinux.org/vuln/CVE-2017-18926
debian not yet assigned CVE-2017-18926 not yet assigned priority: Debian including 1 source packages (raptor2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-18926
redhat medium — https://access.redhat.com/security/cve/CVE-2017-18926
suse high CVE-2017-18926 severity important: SUSE including 174 source package names (libraptor-devel-2.0.15-3.3.1, libraptor-devel-2.0.15-3.8, …), 916 product×package rows across 52 product lines (HPE Helion OpenStack 8, SUSE Enterprise Storage 5, … (52 product lines)): Known Not Affected 847, Fixed 69. https://www.suse.com/security/cve/CVE-2017-18926/
ubuntu medium CVE-2017-18926 medium priority: Ubuntu including 2 source packages (raptor, raptor2), 32 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): released 17, DNE 15. https://ubuntu.com/security/CVE-2017-18926

Affected software / configurations for CVE-2017-18926

Vendor Product Version Raw CPE
librdf raptor_rdf_syntax_library 2.0.15 cpe:2.3:a:librdf:raptor_rdf_syntax_library:2.0.15:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
fedoraproject fedora 31 cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
fedoraproject fedora 32 cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
fedoraproject fedora 33 cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

References for CVE-2017-18926

URL Tags
http://www.openwall.com/lists/oss-security/2020/11/13/1 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/11/13/2 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/11/14/2 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/11/16/2 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/11/16/3 Mailing List Third Party Advisory
https://github.com/LibreOffice/core/blob/master/external/redland/raptor/0001-Calcualte-max-nspace-declarations-correctly-for-XML-.patch.1 Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/11/msg00012.html Mailing List Third Party Advisory
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 Third Party Advisory
https://www.openwall.com/lists/oss-security/2017/06/07/1 Exploit Mailing List Patch Third Party Advisory
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