PT-2026-40607 · Bandit · Bandit
CVSS v4.0
8.7
High
| Vector | AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
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 chunked request bodies. Specifically, the do read chunked data!/5 function buffers every received chunk into an iolist without capping the accumulated body at the configured limit, materializing the entire body as a single binary. Since this process occurs before routing and authentication in standard Phoenix endpoints, sending a single POST request with a Transfer-Encoding: chunked header and an arbitrarily large body can exhaust the BEAM process memory, leading to termination by the operating system's Out-Of-Memory (OOM) killer.Recommendations
Update bandit to version 1.11.1.
Exploit
Fix
Allocation of Resources Without Limits
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Weakness Enumeration
Related Identifiers
Affected Products
Bandit