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CVE-2026-33176 is a denial-of-service vulnerability in Active Support, the support library component used by Ruby on Rails. In affected versions prior to 8.1.2.1, 8.0.4.1, and 7.2.3.1, Active Support number helpers accept string inputs expressed in scientific notation. When such input is processed, BigDecimal can expand the notation into an extremely large decimal representation. Subsequent formatting of that expanded value by the number conversion helpers can drive excessive memory allocation and CPU consumption. The issue was addressed by rejecting scientific notation in NumberConverter.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability in Rails Active Support caused by large scientific notation strings.
A denial-of-service vulnerability in Active Support triggered by large scientific notation strings.
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.