nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Length
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| nghttp2 | nghttp2 | affected |
|
| Package | CPE | Advisory | Released Date |
|---|---|---|---|
| Red Hat Hardened Images | |||
| nghttp2-main-1.69.0-3.1.hum1 | cpe:/a:redhat:hummingbird:1 | RHSA-2026:35454 | 2026-07-03T00:00:00Z |
| curl-main-8.21.0-0.1.1.hum1 | cpe:/a:redhat:hummingbird:1 | RHSA-2026:41240 | 2026-07-17T00:00:00Z |
| Vendor | Product | Versions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Nghttp2 | Nghttp2 |
|
| Source | ID | Title |
|---|---|---|
Ubuntu USN |
USN-8495-1 | nghttp2 vulnerability |
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.253% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Redhat
Redhat hummingbird |
|
| CPEs | cpe:/a:redhat:hummingbird:1 | |
| Vendors & Products |
Redhat
Redhat hummingbird |
|
| References |
| |
| Metrics |
threat_severity
|
threat_severity
|
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
| Type | Values Removed | Values Added |
|---|---|---|
| Description | nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A backend that resolves the resulting ambiguous message in the attacker's favor enables HTTP request/response smuggling and cross-client response-queue poisoning. | |
| Title | nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Length | |
| First Time appeared |
Nghttp2
Nghttp2 nghttp2 |
|
| Weaknesses | CWE-444 | |
| CPEs | cpe:2.3:a:nghttp2:nghttp2:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Nghttp2
Nghttp2 nghttp2 |
|
| References |
| |
| Metrics |
cvssV3_1
|