CVE-2017-18077: index.js in brace-expansion before 1.1.7 is vulnerable to Regular Expression Denial of Service (ReDoS) attacks

Q: How do I fix CVE-2017-18077?

brace expansion: upgrade to 1.1.7. Exact commands for each OS are on this page.

Q: Is CVE-2017-18077 being exploited?

CVE-2017-18077 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-18077 affect?

CVE-2017-18077 affects brace expansion. Severity is high (CVSS 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.

Q: How urgent is CVE-2017-18077?

Priority 58/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2017-18077 is a high-severity flaw (CVSS 7.5) affecting brace expansion. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-01-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: brace expansion project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-01-27 12:29 UTCPublished CVE record published
2026-06-17 01:12 UTCUpdated Record last modified

brace expansion project brace expansion UPGRADE

Affected: < 1.1.7

Fixed in: 1.1.7

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy brace-expansion || rpm -q brace-expansion || brace-expansion --version

2. UPGRADE to 1.1.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade brace-expansion

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade brace-expansion

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-18077?

brace expansion: upgrade to 1.1.7. Exact commands for each OS are on this page.

Is CVE-2017-18077 being exploited?

CVE-2017-18077 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-18077 affect?

CVE-2017-18077 affects brace expansion. Severity is high (CVSS 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.

How urgent is CVE-2017-18077?

Priority 58/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs