EUVD-2026-29951

Bandit: Unauthenticated DoS via chunked request trailers in Bandit HTTP/1 decoder...

GHSA-RF5Q-VWXW-GMRF Bandit: Unauthenticated DoS via chunked request trailers in Bandit HTTP/1 decoder

Summary A worker-pinning denial of service in Bandit's HTTP/1 chunked transfer decoder. Any unauthenticated client that sends a Transfer-Encoding: chunked request whose body ends with a trailer field RFC 9112 §7.1.2 explicitly permits this causes the connection's worker process to spin forever in...

EUVD-2026-29950

Bandit: Unauthenticated one-shot DoS via Transfer-Encoding: chunked...

CVE-2026-39806

Loop with Unreachable Exit Condition 'Infinite Loop' vulnerability in mtrudel bandit allows unauthenticated remote denial of service via worker process exhaustion. 'Elixir.Bandit.HTTP1.Socket':doreadchunkeddata!/5 in lib/bandit/http1/socket.ex terminates only when the last-chunk line 0\r\n is...

CVE-2026-39803

Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion. The chunked clause of 'Elixir.Bandit.HTTP1.Socket':readdata/2 in lib/bandit/http1/socket.ex ignores the caller-supplied :length option when...

CVE-2026-39803

Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion. The chunked clause of 'Elixir.Bandit.HTTP1.Socket':readdata/2 in lib/bandit/http1/socket.ex ignores the caller-supplied :length option when...

PT-2026-40608

Name of the Vulnerable Software and Affected Versions bandit versions 1.6.1 through 1.11.0 Description An infinite loop in the do read chunked data!/5 function within lib/bandit/http1/socket.ex allows unauthenticated remote attackers to cause a denial of service via worker process exhaustion. The...

PT-2026-40607

Name of the Vulnerable Software and Affected Versions bandit versions 1.4.0 through 1.11.0 Description An unauthenticated remote attacker can cause a denial of service via memory exhaustion. The read data/2 function in Elixir.Bandit.HTTP1.Socket ignores the :length option when processing HTTP/1...

EUVD-2026-26716

Bandit HTTP/2 Frame Size Limit Bypass via Late Buffer Check Enables Memory Exhaustion...

GHSA-375F-4R2H-F99J Bandit trusts client-supplied URI scheme on plaintext connections

Summary Bandit reflects the client-supplied URI scheme into conn.scheme without verifying the actual transport. Over a plaintext HTTP/1.1 connection or h2c, an unauthenticated attacker can send an absolute-form request target like GET https://victim/path HTTP/1.1 and the application observes...

EUVD-2026-26714

Bandit trusts client-supplied URI scheme on plaintext connections...

EUVD-2026-26712

Bandit is vulnerable to CL.CL request smuggling via unrejected duplicate Content-Length header...

Bandit is vulnerable to CL.CL request smuggling via unrejected duplicate `Content-Length` header

Summary Bandit is vulnerable to CL.CL HTTP request smuggling: it silently accepts requests with two Content-Length headers whose values differ, takes the first value, and dispatches the body bytes as a second pipelined request on the same keep-alive connection. RFC 9110 §5.3 prohibits multiple...

CVE-2026-39804 WebSocket permessage-deflate inflate has no output-size cap in bandit

Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion when WebSocket permessage-deflate compression is enabled. 'Elixir.Bandit.WebSocket.PerMessageDeflate':inflate/2 in...

CVE-2026-39804

The vulnerability CVE-2026-39804 affects Bandit (Elixir) WebSocket permessage-deflate handling. The function Elixir.Bandit.WebSocket.PerMessageDeflate.inflate/2 calls :zlib.inflate/2 without an output size cap and materializes the full decompressed payload into a single binary, while max_frame_si...

CVE-2026-39807 Client-supplied URI scheme trusted without transport verification in bandit

Reliance on Untrusted Inputs in a Security Decision vulnerability in mtrudel bandit allows unauthenticated transport-state spoofing on plaintext HTTP connections. 'Elixir.Bandit.Pipeline':determinescheme/2 in lib/bandit/pipeline.ex returns the client-supplied URI scheme verbatim, ignoring the...

CVE-2026-39807 Client-supplied URI scheme trusted without transport verification in bandit

Reliance on Untrusted Inputs in a Security Decision vulnerability in mtrudel bandit allows unauthenticated transport-state spoofing on plaintext HTTP connections. 'Elixir.Bandit.Pipeline':determinescheme/2 in lib/bandit/pipeline.ex returns the client-supplied URI scheme verbatim, ignoring the...

CVE-2026-39807

The CVE describes a vulnerability in Bandit (Elixir) where the function Elixir.Bandit.Pipeline:determine_scheme/2 returns the client-supplied URI scheme verbatim, ignoring the transport’s secure flag. On plaintext TCP, a client can declare https and Bandit will set conn.scheme = :https even witho...

CVE-2026-42788 HTTP/2 frame size limit checked after body is buffered in bandit

Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated memory exhaustion via oversized HTTP/2 frames. 'Elixir.Bandit.HTTP2.Frame':deserialize/2 in lib/bandit/http2/frame.ex checks the SETTINGSMAXFRAMESIZE limit only after pattern-matching...

PT-2026-36543

Name of the Vulnerable Software and Affected Versions bandit versions 0.5.0 through 1.10.x Description An allocation of resources without limits or throttling allows unauthenticated remote denial of service via memory exhaustion. The fragment reassembly path in the handle frame/3 function within...