Vulnerability Details CVE-2026-33750
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 step value of `0` is not used.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 6.6%
CVSS Severity
CVSS v3 Score 6.5
References
- https://github.com/juliangruber/brace-expansion/blob/daa71bcb4a30a2df9bcb7f7b8daaf2ab30e5794a/src/index.ts#L107-L113
- https://github.com/juliangruber/brace-expansion/blob/daa71bcb4a30a2df9bcb7f7b8daaf2ab30e5794a/src/index.ts#L184
- https://github.com/juliangruber/brace-expansion/commit/311ac0d54994158c0a384e286a7d6cbb17ee8ed5
- https://github.com/juliangruber/brace-expansion/commit/7fd684f89fdde3549563d0a6522226a9189472a2
- https://github.com/juliangruber/brace-expansion/commit/b9cacd9e55e7a1fa588fe4b7bb1159d52f1d902a
- https://github.com/juliangruber/brace-expansion/issues/98
- https://github.com/juliangruber/brace-expansion/pull/95
- https://github.com/juliangruber/brace-expansion/pull/96
- https://github.com/juliangruber/brace-expansion/pull/97
- https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-f886-m6hf-6m8v
Products affected by CVE-2026-33750
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cpe:2.3:a:juliangruber:brace-expansion:0.0.0
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cpe:2.3:a:juliangruber:brace-expansion:1.0.0
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cpe:2.3:a:juliangruber:brace-expansion:1.0.1
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cpe:2.3:a:juliangruber:brace-expansion:1.1.0
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cpe:2.3:a:juliangruber:brace-expansion:1.1.1
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cpe:2.3:a:juliangruber:brace-expansion:1.1.10
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cpe:2.3:a:juliangruber:brace-expansion:1.1.11
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cpe:2.3:a:juliangruber:brace-expansion:1.1.12
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cpe:2.3:a:juliangruber:brace-expansion:1.1.2
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cpe:2.3:a:juliangruber:brace-expansion:1.1.3
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cpe:2.3:a:juliangruber:brace-expansion:1.1.4
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cpe:2.3:a:juliangruber:brace-expansion:1.1.5
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cpe:2.3:a:juliangruber:brace-expansion:1.1.6
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cpe:2.3:a:juliangruber:brace-expansion:1.1.7
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cpe:2.3:a:juliangruber:brace-expansion:1.1.8
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cpe:2.3:a:juliangruber:brace-expansion:1.1.9
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cpe:2.3:a:juliangruber:brace-expansion:2.0.0
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cpe:2.3:a:juliangruber:brace-expansion:2.0.1
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cpe:2.3:a:juliangruber:brace-expansion:2.0.2
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cpe:2.3:a:juliangruber:brace-expansion:3.0.0
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cpe:2.3:a:juliangruber:brace-expansion:3.0.1
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cpe:2.3:a:juliangruber:brace-expansion:5.0.0
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cpe:2.3:a:juliangruber:brace-expansion:5.0.2
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cpe:2.3:a:juliangruber:brace-expansion:5.0.3
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cpe:2.3:a:juliangruber:brace-expansion:5.0.4