Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Pingora (crates.io package pingora-core) versions before 0.9.0 accepted HTTP/2 requests whose Host header differed from the :authority value, so the application and the upstream could see different hosts. A remote, unauthenticated attacker can send one HTTP/2 request to cause cache poisoning or bypass host-based access control, where the upstream routes by Host. Upgrade to pingora-core 0.9.0 or later, which rejects such requests with 400 Bad Request.
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 |
|---|---|---|---|---|
| 6.3 | Medium | 4.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N | CNA (cloudflare) |
- CISA KEV Not listed.
- EPSS 0.0056, the 46th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:24 UTC First seen by agentprime
- 31 Oct 2026, 14:24 UTC Confirmed by OSV