CVE-2026-69209

See a problem?
Please try reporting it to the source first.

Source

https://cve.org/CVERecord?id=CVE-2026-69209

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-69209.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-69209

Aliases

GHSA-jrxx-w2m8-5hf5

Published

2026-09-15T18:55:29Z

Modified

2026-10-28T02:30:56Z

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: WebSocket decoder accepts unbounded message sizes

Details

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, The shared WebSocket decoder permits unbounded message buffering because defragmentation accumulates fragments without a limit and FrameTranscoder accepts declared lengths up to Int.MaxValue. A remote client that completes a WebSocket handshake against an http4s-blaze-server or http4s-ember-server endpoint can exhaust server memory with oversized frames or fragmented messages. The patched decoder applies a configurable 64 MiB default limit to individual frames and defragmented messages through EmberServerBuilder.withMaxWebSocketMessageSize. 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-2026-69209.json"
}

References

Affected packages

Git / github.com/http4s/http4s

Affected ranges

Type

GIT

Repo

https://github.com/http4s/http4s

Events

Introduced

Fixed

a83f5f4f7e14c5b4d4a91dd71b105cbbbb391298

Introduced

756ce63aee681c5b632bbeafe0b8fde2f3d237f4

Fixed

6083780a3009bd7b26033b0ceb3d32c658b0377e

Fixed

d578c3c9da6193627d40fa785e612cda7fcd77b3

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":  "d578c3c9da6193627d40fa785e612cda7fcd77b3"
                }
            ],
            "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-2026-69209.json"