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

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-2026-39804 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-2026-39807

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-2026-39807 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-2026-42788 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-2026-36542

Name of the Vulnerable Software and Affected Versions bandit versions 1.0.0 through 1.10.f Description Reliance on untrusted inputs in a security decision allows unauthenticated transport-state spoofing on plaintext HTTP connections. The function determine scheme/2 in Elixir.Bandit.Pipeline retur...