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CVE-2026-25547 is a denial-of-service vulnerability in the Node.js package @isaacs/brace-expansion, a hybrid CJS/ESM TypeScript fork of brace-expansion. Versions prior to 5.0.1 perform eager, synchronous expansion of brace patterns. When supplied with patterns containing repeated numeric brace ranges, the library generates every possible combination without adequate bounds checking or complexity limits. Because the number of generated expansions grows exponentially, even relatively small crafted inputs can trigger uncontrolled resource consumption. This can monopolize CPU, exhaust memory, block the Node.js event loop, and terminate the process. The issue is fixed in version 5.0.1.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Denial-of-service vulnerability in the brace-expansion dependency affecting Jira Software Data Center and Jira Service Management Data Center.
A denial-of-service vulnerability in the @isaacs/brace-expansion Node.js library where unbounded numeric brace range expansion can cause exponential computation, leading to excessive CPU/memory usage and potential process crash.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.