CVE-2026-33750: The brace-expansion library generates arbitrary strings containing a common prefix and suffix

Q: How do I fix CVE-2026-33750?

brace-expansion: upgrade to 1.1.13, 2.0.3, 3.0.2, 5.0.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-33750 being exploited?

CVE-2026-33750 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-2026-33750 affect?

CVE-2026-33750 affects brace-expansion. Severity is medium (CVSS 6.5). The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to versions 5.0.5, 3.0.2, 2.0.3, and 1.1.13, a brace pattern with a zero step value (e.g., `{1..2..0}`) causes the sequence generation loop

Q: How urgent is CVE-2026-33750?

Priority 32/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2026-33750 is a medium-severity flaw (CVSS 6.5) affecting brace-expansion. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to versions 5.0.5, 3.0.2, 2.0.3, and 1.1.13, a brace pattern with a zero step value (e.g., `{1..2..0}`) causes the sequence generation loop to run indefinitely, making the process hang for seconds and allocate heaps of memory. Versions 5.0.5, 3.0.2, 2.0.3, and 1.1.13 fix the issue. As a workaround, sanitize strings passed to `expand()` to ensure a

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-400
Published	2026-03-27
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: juliangruber

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 15:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

juliangruber brace-expansion UPGRADE

Affected: < 1.1.13 · >= 2.0.0 and < 2.0.3 · >= 3.0.0 and < 3.0.2 · >= 5.0.0 and < 5.0.5

Fixed in: 1.1.13, 2.0.3, 3.0.2, 5.0.5

Safe to downgrade to: a release before 2.0.0

1. Check installed version

npm ls brace-expansion

2. UPGRADE to 1.1.13

npm install brace-expansion@">=1.1.13"

3. If no update is available yet, DOWNGRADE to a release before 2.0.0

npm view brace-expansion versions npm install brace-expansion@"<2.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-33750?

brace-expansion: upgrade to 1.1.13, 2.0.3, 3.0.2, 5.0.5. Exact commands for each OS are on this page.

Is CVE-2026-33750 being exploited?

CVE-2026-33750 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-2026-33750 affect?

CVE-2026-33750 affects brace-expansion. Severity is medium (CVSS 6.5). The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to versions 5.0.5, 3.0.2, 2.0.3, and 1.1.13, a brace pattern with a zero step value (e.g., `{1..2..0}`) causes the sequence generation loop

How urgent is CVE-2026-33750?

Priority 32/100. No elevated risk signals yet.

Related CVEs

CVE-2026-14257 HIGH 7.5 UPGRADE brace-expansion through 5.0.7 is vulnerable to denial of service via memory exhaustion
CVE-2026-69152 HIGH 7.5 UPGRADE The brace-expansion library generates arbitrary strings containing a common prefix and suffix

References

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