CVE-2018-17143

golang.org/x/net/html has Improper Restriction of Operations within the Bounds of a Memory Buffer

7.5 HighFix available

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.

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

2.77%Up 1.7 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 <template><tBody><isindex/action=0>, leading to a "panic: runtime error" in inBodyIM in parse.go during an html.Parse call.

Record: CVE-2018-17143
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-119
Updated: 2026-11-02

CVE List No score

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.

Record: CVE-2018-17143
Updated: 2026-11-02

EUVDEUVD-2022-3747 No score

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.

Record: EUVD-2022-3747
Updated: 2026-11-03

GitHub AdvisoriesGHSA-fcf9-6fv2-fc5v 7.5

golang.org/x/net/html has Improper Restriction of Operations within the Bounds of a Memory Buffer

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

Record: GHSA-fcf9-6fv2-fc5v
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-119
Updated: 2026-11-02

OSVBELL-CVE-2018-17143 7.5

CVE-2018-17143 does not affect BellSoft software

Record: BELL-CVE-2018-17143
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-fcf9-6fv2-fc5v 7.5

golang.org/x/net/html has Improper Restriction of Operations within the Bounds of a Memory Buffer

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

Record: GHSA-fcf9-6fv2-fc5v
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-119
Updated: 2026-11-02

OSVGO-2022-0193 No score

Panic on unconsidered isindex and template combination in golang.org/x/net/html

The Parse function can panic on some invalid inputs.

For example, the Parse function panics on the input "<template><tBody><isindex/action=0>".

Record: GO-2022-0193
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`golang.org/x/net` Go	before 0.0.0-20180921000356-2f5d2388922f	0.0.0-20180921000356-2f5d2388922f

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-2018-17143 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 2.77%, the 86th percentile. Fixed in golang.org/x/net 0.0.0-20180921000356-2f5d2388922f.

References

Show 7 moreShow less