minimatch: potential denial of service via globparts amplification

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minimatch is a minimal matching utility for converting glob expressions into JavaScript RegExp objects. Starting in 7.0.0 and prior to 11.0.1, src/index.ts implements firstPhasePreProcess() so that, at optimizationLevel 2 or higher, it repeatedly expands attacker-controlled **/.. pattern segments inside a fixpoint loop, allowing generated globParts entries to be processed and expanded again. secondPhasePreProcess() then compares the expanded entries pairwise, so a short malicious glob can cause excessive CPU and memory consumption during pattern compilation. This issue is fixed in version 11.0.1.

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29 Oct 2026 17:07:11 UTC

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3 Nov 2026 16:06:09 UTC

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3 Nov 2026 17:57:17 UTC

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CVSS 4.0 · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

minimatch is a minimal matching utility for converting glob expressions into JavaScript RegExp objects. Starting in 7.0.0 and prior to 11.0.1, src/index.ts implements firstPhasePreProcess() so that, at optimizationLevel 2 or higher, it repeatedly expands attacker-controlled **/.. pattern segments inside a fixpoint loop, allowing generated globParts entries to be processed and expanded again. secondPhasePreProcess() then compares the expanded entries pairwise, so a short malicious glob can cause excessive CPU and memory consumption during pattern compilation. This issue is fixed in version 11.0.1.

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Oct 29, 2026, 5:07:11 PM (timezone not stated)

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Nov 3, 2026, 4:06:09 PM (timezone not stated)

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12 Nov 2026 05:04:27 UTC

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EUVD CVSS 4.0 · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

minimatch is a minimal matching utility for converting glob expressions into JavaScript RegExp objects. Starting in 7.0.0 and prior to 11.0.1, src/index.ts implements firstPhasePreProcess() so that, at optimizationLevel 2 or higher, it repeatedly expands attacker-controlled **/.. pattern segments inside a fixpoint loop, allowing generated globParts entries to be processed and expanded again. secondPhasePreProcess() then compares the expanded entries pairwise, so a short malicious glob can cause excessive CPU and memory consumption during pattern compilation. This issue is fixed in version 11.0.1.

Source published

29 Oct 2026 17:18:07 UTC

Source modified

3 Nov 2026 17:17:59 UTC

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4 Nov 2026 00:59:02 UTC

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CVSS 4.0 · [email protected] · Secondary · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/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:X/AU:X/R:X/V:X/RE:X/U:X

minimatch 10.2.6 contains an attacker-controlled pattern amplification in firstPhasePreProcess() when optimizationLevel >= 2. researcher: Reid Downing (b1nv0id) files: - src/index.ts: 690-770 - src/index.ts: 780-796 issue: input-controlled growth of globParts during first-phase preprocessing, followed by quadratic second-phase processing. the **/../ transformation clones a globparts entry and appends the clone to the same globparts array: ``` parts.splice(gs, 1) const other = parts.slice(0) other[gs] = '**' globParts.push(other) ``` this occurs inside a do...while (didSomething) fixpoint loop, allowing generated entries to be processed again. the expanded globparts array is subsequently processed by secondPhasePreProcess(), which performs pairwise comparisons: ``` for (let i = 0; i < globParts.length - 1; i++) { for (let j = i + 1; j < globParts.length; j++) { this.partsMatch(...) } } ``` an attacker who can supply a glob pattern can therefore cause additional pattern entries to be generated during preprocessing, followed by quadratic pairwise processing, resulting in excessive cpu and memory consumption.

Source published

30 Oct 2026 23:09:55 UTC

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4 Nov 2026 17:01:25 UTC

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4 Nov 2026 17:56:03 UTC

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CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Publisher rating · MODERATE