CVE-2026-69203

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Source
https://cve.org/CVERecord?id=CVE-2026-69203
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-69203.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-69203
Aliases
Published
2026-09-15T19:21:12Z
Modified
2026-10-28T02:31:08Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Http4s Ember HTTP/2: does not enforce SETTINGS_MAX_CONCURRENT_STREAMS
Details

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, An Ember server with HTTP/2 enabled through withHttp2 does not enforce SETTINGS_MAX_CONCURRENT_STREAMS for peer-created streams. One unauthenticated connection can open an unbounded number of streams, each retaining per-stream state until heap exhaustion. The same unchecked allocation is reachable in an ember-client through server-initiated PUSH_PROMISE frames because enablePush is not enforced. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-400",
        "CWE-770"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69203.json"
}
References

Affected packages

Git / github.com/http4s/http4s

Affected ranges

Type
GIT
Repo
https://github.com/http4s/http4s
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
a83f5f4f7e14c5b4d4a91dd71b105cbbbb391298
Introduced
756ce63aee681c5b632bbeafe0b8fde2f3d237f4
Fixed
6083780a3009bd7b26033b0ceb3d32c658b0377e
Fixed
4983de1f93f2caaa3b9de310cf6a9db32c50d66e
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "0.23.35"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "introduced":  "1.0.0-M1"
                },
                {
                    "fixed":  "1.0.0-M47"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "4983de1f93f2caaa3b9de310cf6a9db32c50d66e"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v0.23.35",
            "range":  [
                {
                    "fixed":  "a83f5f4f7e14c5b4d4a91dd71b105cbbbb391298"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "original_tag":  "v1.0.0-M47",
            "range":  [
                {
                    "fixed":  "6083780a3009bd7b26033b0ceb3d32c658b0377e"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

v0.*
v0.23.0
v0.23.0-M1
v0.23.1
v0.23.10
v0.23.11
v0.23.12
v0.23.13
v0.23.14
v0.23.15
v0.23.16
v0.23.18
v0.23.19
v0.23.19-RC1
v0.23.19-RC2
v0.23.2
v0.23.20
v0.23.22
v0.23.23
v0.23.24
v0.23.25
v0.23.26
v0.23.27
v0.23.28
v0.23.29
v0.23.3
v0.23.30
v0.23.31
v0.23.32
v0.23.33
v0.23.34
v0.23.5
v0.23.6
v0.23.7
v0.23.8
v0.23.9
v1.*
v1.0.0-M1
v1.0.0-M10
v1.0.0-M11
v1.0.0-M12
v1.0.0-M13
v1.0.0-M15
v1.0.0-M16
v1.0.0-M17
v1.0.0-M19
v1.0.0-M2
v1.0.0-M20
v1.0.0-M21
v1.0.0-M22
v1.0.0-M24
v1.0.0-M26
v1.0.0-M28
v1.0.0-M29
v1.0.0-M3
v1.0.0-M30
v1.0.0-M31
v1.0.0-M32
v1.0.0-M33
v1.0.0-M34
v1.0.0-M35
v1.0.0-M36
v1.0.0-M37
v1.0.0-M39
v1.0.0-M4
v1.0.0-M40
v1.0.0-M41
v1.0.0-M42
v1.0.0-M43
v1.0.0-M44
v1.0.0-M45
v1.0.0-M46
v1.0.0-M5
v1.0.0-M6
v1.0.0-M7
v1.0.0-M8
v1.0.0-M9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-69203.json"