Weakness Type (CWE)

CWE-770 — CWE-770 Allocation of Resources Without Limits or Throttling

CAPEC

CVSS 4.0 Score

8.7

HIGH

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

Vulnerability 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.

Affected

pkg:hex/wisp

Module Source File Routine
wisp src/wisp.gleam wisp:multipart_body/7
wisp:multipart_headers/5
Status Type Version Changes / Fixed in
affected semver ⓘ 0.2.0 < 2.2.2

pkg:github/gleam-wisp/wisp

Module Source File Routine
wisp src/wisp.gleam wisp:multipart_body/7
wisp:multipart_headers/5
Status Type Version Changes / Fixed in
affected git ⓘ d8e722e22ccb < 7a978748e12a

Workarounds

Deploy a reverse proxy (such as nginx or HAProxy) in front of the wisp application and configure it to enforce request body size limits.

References

Credits

  • Finder: John Downey
  • Remediation developer: Louis Pilfold

CVE record as JSON:  GET /cves/CVE-2026-32145.json
OSV record as JSON:  GET /osv/EEF-CVE-2026-32145.json