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Fencer Vulns
high 7.5

CVE-2018-17847 json

golang.org/x/net/html Improper Validation of Array Index vulnerability

published 2018-10-01 8 y ago modified 2026-09-10 1 mo ago also CVE-2018-17848 , GHSA-4r78-hx75-jjj2 , GHSA-mv93-wvcp-7m7r , GO-2022-0197 , EUVD-2022-2438

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.4%
EPSS 2.4% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

The html package (aka x/net/html) through 2018-09-25 in Go mishandles <svg><template><desc><t><svg></template>, leading to a "panic: runtime error" (index out of range) in (*nodeStack).pop in node.go, called from (*parser).clearActiveFormattingElements, during an html.Parse call.

Patch / fix

  • go golang.org/x/net 0.0.0-20190125002852-4b62a64f59f7

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-2018-17847 updated cvss 5.3

golang-org-x-net-html: index out of range in (*nodeStack).pop in node.go causes runtime panic during html.Parse() call

  • Red Hat OpenStack Platform 9 (Mitaka) Operational Tools golang-googlecode-net-devel Red Hat Storage 3 grafana
    affected: no fix planned “Will not fix”
  • Red Hat Ceph Storage 2 grafana Red Hat Ceph Storage 3 grafana Red Hat Enterprise Linux 7 golang-googlecode-net-devel Red Hat OpenShift Container Platform 3.2 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +7 more Red Hat OpenShift Container Platform 3.3 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +6 more Red Hat OpenShift Container Platform 3.4 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +6 more
    +11 more products
    Red Hat OpenShift Container Platform 3.5 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +6 more Red Hat OpenShift Container Platform 3.6 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +9 more Red Hat OpenShift Container Platform 3.7 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +10 more Red Hat OpenShift Container Platform 3.9 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +8 more Red Hat OpenShift Container Platform 3.10 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +7 more Red Hat OpenShift Container Platform 3.11 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +7 more Red Hat OpenShift Enterprise 3.0 openshift, openshift-node, openshift-master, openshift-clients, openshift-sdn-ovs, tuned-profiles-openshift-node Red Hat OpenShift Enterprise 3.1 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +10 more Red Hat OpenStack Platform 8 (Liberty) Operational Tools grafana Red Hat OpenStack Platform 9 (Mitaka) Operational Tools grafana Red Hat Storage 3 heketi, heketi-client, python-heketi
    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

2.36% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/golang/go/issues/27846 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go golang.org/x/net
<0.0.0-20190125002852-4b62a64f59f7
0.0.0-20190125002852-4b62a64f59f7

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-129 Improper Validation of Array Index

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.