Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The hyper crate versions before 0.14.10 accept some content in Content-Length headers that RFC 7230 treats as illegal. An attacker could use this to smuggle requests when hyper runs as an HTTP/1 server behind an upstream proxy that ignores the header's contents but still forwards it. Exploitation requires several conditions to line up, so it is unlikely. Upgrade to hyper 0.14.10 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 |
|---|---|---|---|---|
| 3.1 | Low | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.011, the 66th percentile, on 7 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