CVE-2026-42545
Granian: DoS via WSGI response header panic
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-248 CWE-755 |
| Vendor | emmett-framework |
| Product | granian |
| Published | May 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
emmett-framework / granian
>= 0.2.0, < 2.7.4