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CVE-2026-58055

MEDIUM
5.4
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-58055
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-06-28 00:55 UTC
Published
2026-06-28 01:32 UTC
Last updated
2026-06-28 01:32 UTC
Primary CWE
CWE-444
Inconsistent Interpretation of HTTP Requests ('HTTP Request/…
Vendor / Product
nghttp2 / nghttp2
Sources
cve.org  ·  NVD

Severity & Metrics

5.4 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Affected products (1)
VendorProductPlatformVersions
nghttp2 nghttp2 — 0 ≤ 1.69.0
Weakness (CWE)
CWESourceDescription
CWE-444 cna Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CVSS scores (2)
ScoreSeverityVersionSourceVector
6.3 MEDIUM 4.0 cna CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:L/SA:N
5.4 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
References (3)
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