CVE-2026-32145

HIGH

Multipart form body parser bypasses body size limits in wisp

Title source: cna

Description

Allocation of Resources Without Limits or Throttling vulnerability in gleam-wisp wisp allows a denial of service via multipart form body parsing. The multipart_body function bypasses configured max_body_size and max_files_size limits. When a multipart boundary is not present in a chunk, the parser takes the MoreRequiredForBody path, which appends the chunk to the output but passes the quota unchanged to the recursive call. Only the final chunk containing the boundary is counted via decrement_quota. The same pattern exists in multipart_headers, where MoreRequiredForHeaders recurses without calling decrement_body_quota. An unauthenticated attacker can exhaust server memory or disk by sending arbitrarily large multipart form submissions in a single HTTP request. This issue affects wisp: from 0.2.0 before 2.2.2.

Scores

CVSS v4 8.7
EPSS 0.0002
EPSS Percentile 4.9%
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-770
Status published
Products (5)
gleam-wisp/wisp 0.2.0 - 2.2.2
gleam-wisp/wisp d8e722e22ccb42bda9d0b6248658d37ab4e9b376 - 7a978748e12ab29db232c222254465890e1a4a90
gleam-wisp/wisp pkg:github/gleam-wisp/wisp@d8e722e22ccb42bda9d0b6248658d37ab4e9b376 - pkg:github/gleam-wisp/wisp@7a978748e12ab29db232c222254465890e1a4a90
gleam-wisp/wisp pkg:hex/[email protected] - pkg:hex/[email protected]
Hex/wisp 0 - 2.2.2Hex
Published Apr 02, 2026
Tracked Since Apr 02, 2026