CVE-2018-17142

golang.org/x/net/html NULL Pointer Dereference vulnerability

7.5 HighFix available

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

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

2.38%Up 1.5 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

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

Record: CVE-2018-17142
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness: CWE-476
Updated: 2026-11-02

CVE List No score

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

Record: CVE-2018-17142
Updated: 2026-11-02

EUVDEUVD-2022-2066 No score

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

Record: EUVD-2022-2066
Updated: 2026-11-03

GitHub AdvisoriesGHSA-2wp2-chmh-r934 7.5

golang.org/x/net/html NULL Pointer Dereference vulnerability

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

Record: GHSA-2wp2-chmh-r934
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-476
Updated: 2026-11-02

OSVBELL-CVE-2018-17142 7.5

CVE-2018-17142 does not affect BellSoft software

Record: BELL-CVE-2018-17142
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVGHSA-2wp2-chmh-r934 7.5

golang.org/x/net/html NULL Pointer Dereference vulnerability

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

Record: GHSA-2wp2-chmh-r934
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-476
Updated: 2026-11-02

OSVGO-2022-0192 No score

Incorrect parsing of nested templates in golang.org/x/net/html

The Parse function can panic on some invalid inputs.

For example, the Parse function panics on the input "<math><template><mo><template>".

Record: GO-2022-0192
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`golang.org/x/net` Go	before 0.0.0-20180925071336-cf3bd585ca2a	0.0.0-20180925071336-cf3bd585ca2a

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-17142 is a high vulnerability (CVSS 7.5) in Golang Net, published September 17, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.38%, the 83rd percentile. Fixed in golang.org/x/net 0.0.0-20180925071336-cf3bd585ca2a.

References

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