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CVE-2026-25547 is a denial-of-service vulnerability in @isaacs/brace-expansion, a hybrid CommonJS/ESM TypeScript fork of brace-expansion. Versions prior to 5.0.1 perform eager, synchronous expansion of brace patterns without adequate bounds checking. When processing attacker-supplied patterns containing repeated numeric brace ranges, the library attempts to generate every possible expansion combination, causing exponential growth in work and output size. This uncontrolled expansion can rapidly exhaust CPU and memory resources and terminate the Node.js 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.
No public exploits tracked yet. Mallory keeps watching.
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.
23 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 brace-expansion caused by unbounded brace range expansion.
A denial of service vulnerability in brace-expansion caused by unbounded brace range expansion.
CVE-2026-25547 is listed in the advisory references, but no description or discussion is provided in the content.
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.