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CVE-2026-49855 is a resource-exhaustion vulnerability in Tornado versions before 6.5.6. Its gzip decompression routines limit individual chunks but do not enforce an overall limit on accumulated decompressed data. A malicious server returning a gzip-compressed response to SimpleAsyncHTTPClient can cause effectively unlimited memory consumption. HTTPServer is also affected when request decompression is enabled through decompress_request=True. Tornado 6.5.6 fixes the issue by enforcing compressed and cumulative decompressed size limits.
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No public exploit code observed for this vulnerability.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A memory-exhaustion denial-of-service vulnerability in Tornado versions before 6.5.6. Gzip decompression lacks an overall limit on accumulated decompressed data, potentially causing effectively unlimited memory consumption in SimpleAsyncHTTPClient or HTTPServer configured with decompress_request=True. The reported CVSS v3 base score is 7.5 (High). Updating to Tornado 6.5.6 or later fixes the issue.
A previously fixed Tornado response-size/decompression accounting vulnerability in SimpleAsyncHTTPClient. It is referenced as the analogous flaw whose protections were absent from CurlAsyncHTTPClient.
A vulnerability referenced by the Miracle Linux AXSA-2026-1848 security advisory/plugin. The content provides no technical details, exploit status, or explicit affected-product mapping for this CVE.
A vulnerability addressed by the Alma Linux ALSA-2026-67146 advisory; the supplied content provides no technical impact, affected-component, or exploitation details specific to this CVE.
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.