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CVE-2026-109584

8.7 high SSVC exploitation: none Published
NVD · CVE.org

Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in the HTTP/2 implementation of mtrudel bandit allows an unauthenticated remote attacker to exhaust server memory via a small HPACK-compressed HEADERS block. The block stores one large cookie value in the HPACK dynamic table and then references it tens of thousands of times with 1-byte indexed fields. In the reporter's run, a 49 KB block made a server with default settings allocate a 183 MB cookie binary before any application code ran, and every concurrent stream can repeat the cost. Bandit.HTTP2.Connection caps only the compressed block (max_header_block_size), and its check of the decoded list against max_header_list_size never fires because that setting defaults to :infinity. combine_cookie_crumbs/1 in lib/bandit/http2/stream.ex then joins every crumb into one binary. This issue affects bandit: from 0.3.3 before 1.14.0.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 6

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-26 15:35
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-26 16:59
  3. StatusReceived → PublishedNVD modified 2026-10-26 15:35
  4. StatusPublished → ReceivedNVD modified 2026-10-26 16:17
  5. StatusReceived → PublishedNVD modified 2026-10-26 13:32
  6. First seenCVSS 8.7NVD modified 2026-10-26 14:16

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 5