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Vulnerability record · CVE-2026-13149 · published 30 June 2026

CVE-2026-13149: Uncontrolled resource consumption vulnerability

brace-expansion through 5.0.6 is vulnerable to denial of service. The expand() function exhibits exponential-time complexity in the number of consecutive non-expanding '{}' brace groups. An attacker who passes a crafted string to expand(), directly or transitively, can cause significant CPU consumption and event-loop blocking. The max option does not mitigate this, as it bounds the output size rather than the recursion work.

7.7 CVSS 4.0 High EPSS 0.36% · top 72.3% CWE-400 · Uncontrolled resource consumptionCWE-407 · CWE-407 Deferred
7.7CVSS 4.0 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
8 Jul 2026Last modified by NVD

Description

brace-expansion through 5.0.6 is vulnerable to denial of service. The expand() function exhibits exponential-time complexity in the number of consecutive non-expanding '{}' brace groups. An attacker who passes a crafted string to expand(), directly or transitively, can cause significant CPU consumption and event-loop blocking. The max option does not mitigate this, as it bounds the output size rather than the recursion work.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:

References

LinkTags
https://github.com/juliangruber/brace-expansion/commit/c7e33ec13ac1a684c116720843ce24e208611754
https://www.npmjs.com/package/brace-expansion

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Source: NIST National Vulnerability Database (record CVE-2026-13149), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.