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CVE-2026-33174 is a denial-of-service vulnerability in Rails Active Storage affecting proxy delivery mode prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1. When handling HTTP Range requests for blob downloads, the proxy path parses user-supplied byte ranges and loads the entire requested range into memory before sending it to the client. Large or unbounded ranges can therefore trigger memory allocation proportional to the requested content size. In practice, this behavior allows a remote client to force excessive heap allocation during blob streaming, because the application intermediates the transfer instead of redirecting the client to the storage backend. The issue was addressed by introducing configurable maximum streaming chunk sizes and limiting blob byte ranges to 100 MB by default.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.