How severe is CVE-2026-45149?

CVE-2026-45149 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-45149 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-45149?

CVE-2026-45149 affects Juliangruber Brace-expansion. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-45149?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-45149 have an EU (EUVD) identifier?

Yes. CVE-2026-45149 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33442.

When was CVE-2026-45149 published?

CVE-2026-45149 was published on 2026-05-29 and last updated on 2026-06-17.

CVE-2026-45149

CVE-2026-45149 is a medium-severity vulnerability in Juliangruber Brace-expansion with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33442
Weakness: CWE-400
Affected product: Juliangruber Brace-expansion
Published: 2026-05-29
Last modified: 2026-06-17

Description

The brace-expansion library generates arbitrary strings containing a common prefix and suffix. From 5.0.0 to before 5.0.6, the max option was being applied too late. When expanding a single large numeric range like {1..10000000}, the sequence generation loop generates all 10 million intermediate elements before the max limit is applied With max=10, the output is correctly limited to 10 items, but the process still allocates ~505 MB and spends ~800ms building the full intermediate array. This vulnerability is fixed in 5.0.6.

Frequently asked questions

What is CVE-2026-45149?: The brace-expansion library generates arbitrary strings containing a common prefix and suffix. From 5.0.0 to before 5.0.6, the max option was being applied too late. When expanding a single large numeric range like {1..10000000}, the sequence generation loop generates all 10 million intermediate elements before the max limit is applied With max=10, the output is correctly limited to 10 items, but the process still allocates ~505 MB and spends ~800ms building the full intermediate array. This vulnerability is fixed in 5.0.6.
How severe is CVE-2026-45149?: CVE-2026-45149 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-45149 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-45149?: CVE-2026-45149 affects Juliangruber Brace-expansion. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-45149?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-45149 have an EU (EUVD) identifier?: Yes. CVE-2026-45149 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33442.
When was CVE-2026-45149 published?: CVE-2026-45149 was published on 2026-05-29 and last updated on 2026-06-17.

References

https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-jxxr-4gwj-5jf2

Affected products (1)

cpe:2.3:a:juliangruber:brace-expansion:*:*:*:*:*:node.js:*:*

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