Public proof of conceptFix available

CVE-2017-9049

A public proof of concept exists; no exploitation attested.

Published2017-05-18
WeaknessCWE-125

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a heap-based buffer over-read in the xmlDictComputeFastKey function in dict.c. This vulnerability causes programs that use libxml2, such as PHP, to crash. This vulnerability exists because of an incomplete fix for libxml2 Bug 759398.

Timeline

dates in UTC

2017-05-1806:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-9049?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-9049?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Xmlsoft libxml2

Branch	Affected	Fixed in	Source
2.9	= 2.9.4	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

www.openwall.comPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionpoc2025-12-18
OpenCVESSVC decisionpoc—
CISA-ADPCVSS 3.17.52025-12-18
NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CISA-ADPweakness (CWE)CWE-1252025-12-18
NVDweakness (CWE)CWE-125read 2026-10-23
FIRST EPSSEPSS score4.6 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2017-05-18
Last Modified: 2026-10-14
NVD status: Modified

Frequently asked questions

What is CVE-2017-9049?

Is CVE-2017-9049 actively exploited?

A proof-of-concept exploit exists for CVE-2017-9049, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2017-9049?

CVE-2017-9049 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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