CVE-2017-18077

ReDoS in brace-expansion

7.5 HighFix available

index.js in brace-expansion before 1.1.7 is vulnerable to Regular Expression Denial of Service (ReDoS) attacks, as demonstrated by an expand argument containing many comma characters.

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

2.58%Up 1.3 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

index.js in brace-expansion before 1.1.7 is vulnerable to Regular Expression Denial of Service (ReDoS) attacks, as demonstrated by an expand argument containing many comma characters.

Record: CVE-2017-18077
CVSS 3.0: 7.5 HighCVSS:3.0/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-20
Updated: 2026-11-02

CVE List No score

index.js in brace-expansion before 1.1.7 is vulnerable to Regular Expression Denial of Service (ReDoS) attacks, as demonstrated by an expand argument containing many comma characters.

Record: CVE-2017-18077
Updated: 2026-11-02

EUVDEUVD-2018-0155 No score

index.js in brace-expansion before 1.1.7 is vulnerable to Regular Expression Denial of Service (ReDoS) attacks, as demonstrated by an expand argument containing many comma characters.

Record: EUVD-2018-0155
Updated: 2026-11-03

GitHub AdvisoriesGHSA-832h-xg76-4gv6 7.5

ReDoS in brace-expansion

Affected versions of brace-expansion are vulnerable to a regular expression denial of service condition.

Proof of Concept

var expand = require('brace-expansion');
expand('{,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,\n}');

Recommendation

Update to version 1.1.7 or later.

Record: GHSA-832h-xg76-4gv6
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-1333
Updated: 2026-11-02

OSV 7.5

index.js in brace-expansion before 1.1.7 is vulnerable to Regular Expression Denial of Service (ReDoS) attacks, as demonstrated by an expand argument containing many comma characters.

Record: CVE-2017-18077
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2017-18077 7.5

index.js in brace-expansion before 1.1.7 is vulnerable to Regular Expression Denial of Service (ReDoS) attacks, as demonstrated by an expand argument containing many comma characters.

Record: DEBIAN-CVE-2017-18077
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVGHSA-832h-xg76-4gv6 7.5

ReDoS in brace-expansion

Affected versions of brace-expansion are vulnerable to a regular expression denial of service condition.

Proof of Concept

var expand = require('brace-expansion');
expand('{,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,\n}');

Recommendation

Update to version 1.1.7 or later.

Record: GHSA-832h-xg76-4gv6
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-1333
Updated: 2026-11-02

OSVRHSA-2020:2625 7.7

Red Hat Security Advisory: rh-nodejs8-nodejs security update

Record: RHSA-2020:2625
CVSS 3.0: 7.7 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated: 2026-11-02

OSVCLSA-2026-1792163293 No score

TuxCare security update for brace-expansion (1 CVE)

TuxCare rebuilt brace-expansion to address 1 CVE. Fixed in 1.1.3-tuxcare.1.

Record: CLSA-2026-1792163293
Updated: 2026-11-02

Affected products

brace expansion project expansion

Affected packages

Affected packages
Package	Affected	Fixed
`brace-expansion` npm	before 1.1.7	1.1.7
`brace-expansion` TuxCare:npm	1.1.3-tuxcare.0 up to 1.1.3-tuxcare.1, plus listed versions 1.1.3	1.1.3-tuxcare.1
`node-brace-expansion` Debian:12	before 1.1.8-1	1.1.8-1
`node-brace-expansion` Debian:13	before 1.1.8-1	1.1.8-1
`node-brace-expansion` Debian:14	before 1.1.8-1	1.1.8-1
`rh-nodejs8-nodejs` Red Hat:rhel_software_collections:3::el7	before 0:8.17.0-2.el7	0:8.17.0-2.el7
`rh-nodejs8-nodejs-debuginfo` Red Hat:rhel_software_collections:3::el7	before 0:8.17.0-2.el7	0:8.17.0-2.el7
`rh-nodejs8-nodejs-devel` Red Hat:rhel_software_collections:3::el7	before 0:8.17.0-2.el7	0:8.17.0-2.el7
`rh-nodejs8-nodejs-docs` Red Hat:rhel_software_collections:3::el7	before 0:8.17.0-2.el7	0:8.17.0-2.el7
`rh-nodejs8-npm` Red Hat:rhel_software_collections:3::el7	before 0:6.13.4-8.17.0.2.el7	0:6.13.4-8.17.0.2.el7

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-2017-18077 is a high vulnerability (CVSS 7.5) in Brace Expansion Project Expansion, published January 27, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.58%, the 85th percentile. Fixed in brace-expansion 1.1.7.

References

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