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CVE-2026-33658 is a denial-of-service vulnerability in Rails Active Storage affecting versions prior to 8.1.2.1, 8.0.4.1, and 7.2.3.1. The flaw is in Active Storage's proxy controller, which fails to limit the number of byte ranges accepted in an HTTP Range header. By submitting a request containing thousands of small byte ranges for the same file, an attacker can trigger disproportionately high CPU consumption relative to a normal ranged or full-file request. The issue stems from insufficient restriction of multipart byte-range processing in the proxy path. The fix limits range requests to a single range.
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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.
3 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.