CVE-2018-17143

Exp

The html package (aka x/net/html) through 2018-09-17 in Go mishandles <template><tBody><isindex/action=0>, leading to a "panic: runtime error" in inBodyIM in parse.go during an html.Parse call.

Published: 2018-09-17 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-17143 is rated High Exploit Risk (76.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.77%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.12% over the last day, indicating growing attacker interest. 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-2018-17143

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

Exploit prediction scoring system (EPSS) score for CVE-2018-17143

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 2026-06-15 0.65% 2.77% +2.12%
2 2025-11-21 0.71% 0.65% -0.06%
3 2025-11-18 — 0.71% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-17143

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
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:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2018-17143

GitHub Security Advisory for CVE-2018-17143

GHSA-fcf9-6fv2-fc5v · Severity: high · Ecosystem: go — golang.org/x/net/html has Improper Restriction of Operations within the Bounds of a Memory Buffer

OS Trackers for CVE-2018-17143

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2018-17143
ubuntu medium CVE-2018-17143 medium priority: Ubuntu including 1 source packages (golang-golang-x-net-dev), 5 status rows across 5 suites (bionic, cosmic, trusty, upstream, xenial): not-affected 3, DNE 1, needs-triage 1. https://ubuntu.com/security/CVE-2018-17143

Affected software / configurations for CVE-2018-17143

Vendor Product Version Raw CPE
golang net <= 2018-09-17 cpe:2.3:a:golang:net:*:*:*:*:*:*:*:*
fedoraproject fedora 28 cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:*
fedoraproject fedora 29 cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*

References for CVE-2018-17143

cvelogic Threat Intelligence