CVE-2026-42545
Medium
Description
Granian is a Rust HTTP server for Python applications. From 0.2.0 to 2.7.4, Granian aborts a worker process if a WSGI application returns an invalid HTTP response header name or value. The WSGI response conversion path uses .unwrap() on both the header name and header value constructors, so malformed output from the application becomes a process abort instead of a handled error. This vulnerability is fixed in 2.7.4.
SeverityMedium
CVSS5.9
Exploit probability—
ProductGranian
PublishedMay 12, 2026
First seenMay 12, 2026
Weakness typeCWE-248CWE-248CWE-755CWE-755
How to fix
Update
- granian2.7.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| granianPyPI | 0.2.0 ≤ v < 2.7.4 | 2.7.4 |
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