Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Granian versions 0.2.0 up to but not including 2.7.4 can abort a worker process when a WSGI application returns an invalid response header name or value, such as one containing a space, a carriage return and line feed, or a null byte. The attacker must be able to influence headers produced by the WSGI application, or the application must have a bug that generates them; the crash then causes a denial of service for that worker. Upgrade to Granian 2.7.4 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.9 | Medium | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0027, the 19th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:11 UTC First seen by agentprime
- 31 Oct 2026, 14:11 UTC Confirmed by OSV