CVEDB API

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-58055

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.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.002

EPSS Ranking 10.3%

CVSS Severity

CVSS v3 Score 5.4

References

Products affected by CVE-2026-58055

Nghttp2 » Nghttp2 » Version: 0.1.0

cpe:2.3:a:nghttp2:nghttp2:0.1.0
Nghttp2 » Nghttp2 » Version: 0.2.0

cpe:2.3:a:nghttp2:nghttp2:0.2.0
Nghttp2 » Nghttp2 » Version: 0.3.0

cpe:2.3:a:nghttp2:nghttp2:0.3.0
Nghttp2 » Nghttp2 » Version: 0.3.1

cpe:2.3:a:nghttp2:nghttp2:0.3.1
Nghttp2 » Nghttp2 » Version: 0.3.2

cpe:2.3:a:nghttp2:nghttp2:0.3.2
Nghttp2 » Nghttp2 » Version: 0.4.0

cpe:2.3:a:nghttp2:nghttp2:0.4.0
Nghttp2 » Nghttp2 » Version: 0.4.1

cpe:2.3:a:nghttp2:nghttp2:0.4.1
Nghttp2 » Nghttp2 » Version: 0.5.0

cpe:2.3:a:nghttp2:nghttp2:0.5.0
Nghttp2 » Nghttp2 » Version: 0.5.1

cpe:2.3:a:nghttp2:nghttp2:0.5.1
Nghttp2 » Nghttp2 » Version: 0.6.0

cpe:2.3:a:nghttp2:nghttp2:0.6.0
Nghttp2 » Nghttp2 » Version: 0.6.1

cpe:2.3:a:nghttp2:nghttp2:0.6.1
Nghttp2 » Nghttp2 » Version: 0.6.2

cpe:2.3:a:nghttp2:nghttp2:0.6.2
Nghttp2 » Nghttp2 » Version: 0.6.3

cpe:2.3:a:nghttp2:nghttp2:0.6.3
Nghttp2 » Nghttp2 » Version: 0.6.4

cpe:2.3:a:nghttp2:nghttp2:0.6.4
Nghttp2 » Nghttp2 » Version: 0.6.5

cpe:2.3:a:nghttp2:nghttp2:0.6.5
Nghttp2 » Nghttp2 » Version: 0.6.6

cpe:2.3:a:nghttp2:nghttp2:0.6.6
Nghttp2 » Nghttp2 » Version: 0.6.7

cpe:2.3:a:nghttp2:nghttp2:0.6.7
Nghttp2 » Nghttp2 » Version: 0.7.0

cpe:2.3:a:nghttp2:nghttp2:0.7.0
Nghttp2 » Nghttp2 » Version: 0.7.1

cpe:2.3:a:nghttp2:nghttp2:0.7.1
Nghttp2 » Nghttp2 » Version: 0.7.10

cpe:2.3:a:nghttp2:nghttp2:0.7.10
Nghttp2 » Nghttp2 » Version: 0.7.11

cpe:2.3:a:nghttp2:nghttp2:0.7.11
Nghttp2 » Nghttp2 » Version: 0.7.12

cpe:2.3:a:nghttp2:nghttp2:0.7.12
Nghttp2 » Nghttp2 » Version: 0.7.13

cpe:2.3:a:nghttp2:nghttp2:0.7.13
Nghttp2 » Nghttp2 » Version: 0.7.14

cpe:2.3:a:nghttp2:nghttp2:0.7.14
Nghttp2 » Nghttp2 » Version: 0.7.15

cpe:2.3:a:nghttp2:nghttp2:0.7.15
Nghttp2 » Nghttp2 » Version: 0.7.2

cpe:2.3:a:nghttp2:nghttp2:0.7.2
Nghttp2 » Nghttp2 » Version: 0.7.3

cpe:2.3:a:nghttp2:nghttp2:0.7.3
Nghttp2 » Nghttp2 » Version: 0.7.4

cpe:2.3:a:nghttp2:nghttp2:0.7.4
Nghttp2 » Nghttp2 » Version: 0.7.5

cpe:2.3:a:nghttp2:nghttp2:0.7.5
Nghttp2 » Nghttp2 » Version: 0.7.6

cpe:2.3:a:nghttp2:nghttp2:0.7.6
Nghttp2 » Nghttp2 » Version: 0.7.7

cpe:2.3:a:nghttp2:nghttp2:0.7.7
Nghttp2 » Nghttp2 » Version: 0.7.8

cpe:2.3:a:nghttp2:nghttp2:0.7.8
Nghttp2 » Nghttp2 » Version: 0.7.9

cpe:2.3:a:nghttp2:nghttp2:0.7.9
Nghttp2 » Nghttp2 » Version: 1.0.0

cpe:2.3:a:nghttp2:nghttp2:1.0.0
Nghttp2 » Nghttp2 » Version: 1.0.1

cpe:2.3:a:nghttp2:nghttp2:1.0.1
Nghttp2 » Nghttp2 » Version: 1.0.2

cpe:2.3:a:nghttp2:nghttp2:1.0.2
Nghttp2 » Nghttp2 » Version: 1.0.3

cpe:2.3:a:nghttp2:nghttp2:1.0.3
Nghttp2 » Nghttp2 » Version: 1.0.4

cpe:2.3:a:nghttp2:nghttp2:1.0.4
Nghttp2 » Nghttp2 » Version: 1.0.5

cpe:2.3:a:nghttp2:nghttp2:1.0.5
Nghttp2 » Nghttp2 » Version: 1.1.0

cpe:2.3:a:nghttp2:nghttp2:1.1.0
Nghttp2 » Nghttp2 » Version: 1.1.1

cpe:2.3:a:nghttp2:nghttp2:1.1.1
Nghttp2 » Nghttp2 » Version: 1.1.2

cpe:2.3:a:nghttp2:nghttp2:1.1.2
Nghttp2 » Nghttp2 » Version: 1.10.0

cpe:2.3:a:nghttp2:nghttp2:1.10.0
Nghttp2 » Nghttp2 » Version: 1.11.0

cpe:2.3:a:nghttp2:nghttp2:1.11.0
Nghttp2 » Nghttp2 » Version: 1.11.1

cpe:2.3:a:nghttp2:nghttp2:1.11.1
Nghttp2 » Nghttp2 » Version: 1.12.0

cpe:2.3:a:nghttp2:nghttp2:1.12.0
Nghttp2 » Nghttp2 » Version: 1.13.0

cpe:2.3:a:nghttp2:nghttp2:1.13.0
Nghttp2 » Nghttp2 » Version: 1.14.0

cpe:2.3:a:nghttp2:nghttp2:1.14.0
Nghttp2 » Nghttp2 » Version: 1.14.1

cpe:2.3:a:nghttp2:nghttp2:1.14.1
Nghttp2 » Nghttp2 » Version: 1.15.0

cpe:2.3:a:nghttp2:nghttp2:1.15.0
Nghttp2 » Nghttp2 » Version: 1.16.0

cpe:2.3:a:nghttp2:nghttp2:1.16.0
Nghttp2 » Nghttp2 » Version: 1.16.1

cpe:2.3:a:nghttp2:nghttp2:1.16.1
Nghttp2 » Nghttp2 » Version: 1.17.0

cpe:2.3:a:nghttp2:nghttp2:1.17.0
Nghttp2 » Nghttp2 » Version: 1.18.0

cpe:2.3:a:nghttp2:nghttp2:1.18.0
Nghttp2 » Nghttp2 » Version: 1.18.1

cpe:2.3:a:nghttp2:nghttp2:1.18.1
Nghttp2 » Nghttp2 » Version: 1.19.0

cpe:2.3:a:nghttp2:nghttp2:1.19.0
Nghttp2 » Nghttp2 » Version: 1.2.0

cpe:2.3:a:nghttp2:nghttp2:1.2.0
Nghttp2 » Nghttp2 » Version: 1.2.1

cpe:2.3:a:nghttp2:nghttp2:1.2.1
Nghttp2 » Nghttp2 » Version: 1.20.0

cpe:2.3:a:nghttp2:nghttp2:1.20.0
Nghttp2 » Nghttp2 » Version: 1.21.0

cpe:2.3:a:nghttp2:nghttp2:1.21.0
Nghttp2 » Nghttp2 » Version: 1.21.1

cpe:2.3:a:nghttp2:nghttp2:1.21.1
Nghttp2 » Nghttp2 » Version: 1.22.0

cpe:2.3:a:nghttp2:nghttp2:1.22.0
Nghttp2 » Nghttp2 » Version: 1.23.0

cpe:2.3:a:nghttp2:nghttp2:1.23.0
Nghttp2 » Nghttp2 » Version: 1.23.1

cpe:2.3:a:nghttp2:nghttp2:1.23.1
Nghttp2 » Nghttp2 » Version: 1.24.0

cpe:2.3:a:nghttp2:nghttp2:1.24.0
Nghttp2 » Nghttp2 » Version: 1.25.0

cpe:2.3:a:nghttp2:nghttp2:1.25.0
Nghttp2 » Nghttp2 » Version: 1.26.0

cpe:2.3:a:nghttp2:nghttp2:1.26.0
Nghttp2 » Nghttp2 » Version: 1.27.0

cpe:2.3:a:nghttp2:nghttp2:1.27.0
Nghttp2 » Nghttp2 » Version: 1.28.0

cpe:2.3:a:nghttp2:nghttp2:1.28.0
Nghttp2 » Nghttp2 » Version: 1.29.0

cpe:2.3:a:nghttp2:nghttp2:1.29.0
Nghttp2 » Nghttp2 » Version: 1.3.0

cpe:2.3:a:nghttp2:nghttp2:1.3.0
Nghttp2 » Nghttp2 » Version: 1.3.1

cpe:2.3:a:nghttp2:nghttp2:1.3.1
Nghttp2 » Nghttp2 » Version: 1.3.2

cpe:2.3:a:nghttp2:nghttp2:1.3.2
Nghttp2 » Nghttp2 » Version: 1.3.3

cpe:2.3:a:nghttp2:nghttp2:1.3.3
Nghttp2 » Nghttp2 » Version: 1.3.4

cpe:2.3:a:nghttp2:nghttp2:1.3.4
Nghttp2 » Nghttp2 » Version: 1.30.0

cpe:2.3:a:nghttp2:nghttp2:1.30.0
Nghttp2 » Nghttp2 » Version: 1.31.0

cpe:2.3:a:nghttp2:nghttp2:1.31.0
Nghttp2 » Nghttp2 » Version: 1.31.1

cpe:2.3:a:nghttp2:nghttp2:1.31.1
Nghttp2 » Nghttp2 » Version: 1.32.0

cpe:2.3:a:nghttp2:nghttp2:1.32.0
Nghttp2 » Nghttp2 » Version: 1.32.1

cpe:2.3:a:nghttp2:nghttp2:1.32.1
Nghttp2 » Nghttp2 » Version: 1.33.0

cpe:2.3:a:nghttp2:nghttp2:1.33.0
Nghttp2 » Nghttp2 » Version: 1.34.0

cpe:2.3:a:nghttp2:nghttp2:1.34.0
Nghttp2 » Nghttp2 » Version: 1.35.0

cpe:2.3:a:nghttp2:nghttp2:1.35.0
Nghttp2 » Nghttp2 » Version: 1.35.1

cpe:2.3:a:nghttp2:nghttp2:1.35.1
Nghttp2 » Nghttp2 » Version: 1.36.0

cpe:2.3:a:nghttp2:nghttp2:1.36.0
Nghttp2 » Nghttp2 » Version: 1.37.0

cpe:2.3:a:nghttp2:nghttp2:1.37.0
Nghttp2 » Nghttp2 » Version: 1.38.0

cpe:2.3:a:nghttp2:nghttp2:1.38.0
Nghttp2 » Nghttp2 » Version: 1.39.0

cpe:2.3:a:nghttp2:nghttp2:1.39.0
Nghttp2 » Nghttp2 » Version: 1.39.1

cpe:2.3:a:nghttp2:nghttp2:1.39.1
Nghttp2 » Nghttp2 » Version: 1.39.2

cpe:2.3:a:nghttp2:nghttp2:1.39.2
Nghttp2 » Nghttp2 » Version: 1.4.0

cpe:2.3:a:nghttp2:nghttp2:1.4.0
Nghttp2 » Nghttp2 » Version: 1.40.0

cpe:2.3:a:nghttp2:nghttp2:1.40.0
Nghttp2 » Nghttp2 » Version: 1.41.0

cpe:2.3:a:nghttp2:nghttp2:1.41.0
Nghttp2 » Nghttp2 » Version: 1.42.0

cpe:2.3:a:nghttp2:nghttp2:1.42.0
Nghttp2 » Nghttp2 » Version: 1.43.0

cpe:2.3:a:nghttp2:nghttp2:1.43.0
Nghttp2 » Nghttp2 » Version: 1.44.0

cpe:2.3:a:nghttp2:nghttp2:1.44.0
Nghttp2 » Nghttp2 » Version: 1.45.0

cpe:2.3:a:nghttp2:nghttp2:1.45.0
Nghttp2 » Nghttp2 » Version: 1.45.1

cpe:2.3:a:nghttp2:nghttp2:1.45.1
Nghttp2 » Nghttp2 » Version: 1.46.0

cpe:2.3:a:nghttp2:nghttp2:1.46.0
Nghttp2 » Nghttp2 » Version: 1.47.0

cpe:2.3:a:nghttp2:nghttp2:1.47.0
Nghttp2 » Nghttp2 » Version: 1.48.0

cpe:2.3:a:nghttp2:nghttp2:1.48.0
Nghttp2 » Nghttp2 » Version: 1.49.0

cpe:2.3:a:nghttp2:nghttp2:1.49.0
Nghttp2 » Nghttp2 » Version: 1.5.0

cpe:2.3:a:nghttp2:nghttp2:1.5.0
Nghttp2 » Nghttp2 » Version: 1.50.0

cpe:2.3:a:nghttp2:nghttp2:1.50.0
Nghttp2 » Nghttp2 » Version: 1.51.0

cpe:2.3:a:nghttp2:nghttp2:1.51.0
Nghttp2 » Nghttp2 » Version: 1.52.0

cpe:2.3:a:nghttp2:nghttp2:1.52.0
Nghttp2 » Nghttp2 » Version: 1.53.0

cpe:2.3:a:nghttp2:nghttp2:1.53.0
Nghttp2 » Nghttp2 » Version: 1.54.0

cpe:2.3:a:nghttp2:nghttp2:1.54.0
Nghttp2 » Nghttp2 » Version: 1.55.0

cpe:2.3:a:nghttp2:nghttp2:1.55.0
Nghttp2 » Nghttp2 » Version: 1.55.1

cpe:2.3:a:nghttp2:nghttp2:1.55.1
Nghttp2 » Nghttp2 » Version: 1.56.0

cpe:2.3:a:nghttp2:nghttp2:1.56.0
Nghttp2 » Nghttp2 » Version: 1.57.0

cpe:2.3:a:nghttp2:nghttp2:1.57.0
Nghttp2 » Nghttp2 » Version: 1.58.0

cpe:2.3:a:nghttp2:nghttp2:1.58.0
Nghttp2 » Nghttp2 » Version: 1.59.0

cpe:2.3:a:nghttp2:nghttp2:1.59.0
Nghttp2 » Nghttp2 » Version: 1.6.0

cpe:2.3:a:nghttp2:nghttp2:1.6.0
Nghttp2 » Nghttp2 » Version: 1.60.0

cpe:2.3:a:nghttp2:nghttp2:1.60.0
Nghttp2 » Nghttp2 » Version: 1.61.0

cpe:2.3:a:nghttp2:nghttp2:1.61.0
Nghttp2 » Nghttp2 » Version: 1.62.0

cpe:2.3:a:nghttp2:nghttp2:1.62.0
Nghttp2 » Nghttp2 » Version: 1.62.1

cpe:2.3:a:nghttp2:nghttp2:1.62.1
Nghttp2 » Nghttp2 » Version: 1.63.0

cpe:2.3:a:nghttp2:nghttp2:1.63.0
Nghttp2 » Nghttp2 » Version: 1.64.0

cpe:2.3:a:nghttp2:nghttp2:1.64.0
Nghttp2 » Nghttp2 » Version: 1.65.0

cpe:2.3:a:nghttp2:nghttp2:1.65.0
Nghttp2 » Nghttp2 » Version: 1.66.0

cpe:2.3:a:nghttp2:nghttp2:1.66.0
Nghttp2 » Nghttp2 » Version: 1.67.0

cpe:2.3:a:nghttp2:nghttp2:1.67.0
Nghttp2 » Nghttp2 » Version: 1.67.1

cpe:2.3:a:nghttp2:nghttp2:1.67.1
Nghttp2 » Nghttp2 » Version: 1.68.0

cpe:2.3:a:nghttp2:nghttp2:1.68.0
Nghttp2 » Nghttp2 » Version: 1.68.1

cpe:2.3:a:nghttp2:nghttp2:1.68.1
Nghttp2 » Nghttp2 » Version: 1.7.0

cpe:2.3:a:nghttp2:nghttp2:1.7.0
Nghttp2 » Nghttp2 » Version: 1.7.1

cpe:2.3:a:nghttp2:nghttp2:1.7.1
Nghttp2 » Nghttp2 » Version: 1.8.0

cpe:2.3:a:nghttp2:nghttp2:1.8.0
Nghttp2 » Nghttp2 » Version: 1.9.0

cpe:2.3:a:nghttp2:nghttp2:1.9.0
Nghttp2 » Nghttp2 » Version: 1.9.1

cpe:2.3:a:nghttp2:nghttp2:1.9.1
Nghttp2 » Nghttp2 » Version: 1.9.2

cpe:2.3:a:nghttp2:nghttp2:1.9.2

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-58055

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