CVE-2026-32145 Multipart form body parser bypasses body size limits in wisp
An unauthenticated attacker can cause denial of service by exhausting server resources through multipart form submissions that bypass size limits.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-32145?
CVE-2026-32145 is a high-severity denial of service vulnerability in gleam-wisp wisp, published on 2 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-770
Which versions are affected by CVE-2026-32145?
3 open source packages ship an affected version, including wisp. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
wisp Hex | All versions | 2.2.2 |
wisp Hex | All versions | 2.2.2 |
wisp Hex | From 0.2.0 | 2.2.2 |
Products include Gleam-Wisp Wisp.
How do I fix CVE-2026-32145?
Upgrade wisp to 2.2.2 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-32145 being exploited?
There is no known exploitation of CVE-2026-32145 in the wild and no public exploit code.
Other vulnerabilities in gleam-wisp wisp
Sources
Also known as EEF-CVE-2026-32145, GHSA-8645-p2v4-73r2.