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Not in CISA KEV
HIGH severity

CVE-2018-17848 — FEDORA

HIGH

CVE-2018-17848 is a high-severity (CVSS 7.5) CWE-129 vulnerability in fedoraproject fedora. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. Versions up to 2018-09-25 are affected; the records list no fixed version yet, so check the vendor advisory below.

The html package (aka x/net/html) through 2018-09-25 in Go mishandles <math><template><mn><b></template>, leading to a "panic: runtime error" (index out of range) in (*insertionModeStack).pop…

Published
Updated
Affected
2 products
Patched
See advisory
Exploits
1 known
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs83th percentile — riskier than 83% of all scored CVEsHighest risk
0.10%1.16%2.21%3.27%0.7%2.2%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Description

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

Affected Products

2 products · 3 configurations
OS
fedorafedoraproject
2 versions
2829
Application
netgolang
≤ 2018-09-25
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

The html package (aka x/net/html) through 2018-09-25 in Go mishandles <m…

github.comNVDJun 2020

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every fedoraproject fedora deployment and check each version against the affected-products list above.

  2. Remediation status

    The records we use list no fixed version for CVE-2018-17848 (versions up to 2018-09-25 are affected). Check the fedoraproject fedora advisory for a patched release, and apply the workarounds below until you can upgrade.

  3. Mitigate without a patch

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

The html package (aka x/net/html) through 2018-09-25 in Go mishandles <math><template><mn><b></template>, leading to a "panic: runtime error" (index out of range) in (*insertionModeStack).pop in node.go, called from inHeadIM, during an html.Parse call.
O3 Security · Runtime Protection

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Detect and block the exploit chain at execution, on systems you cannot patch yet.

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CVE-2018-17848: FEDORA (High 7.5)