Vulnerability-Lookup

CVE-2026-69202 (GCVE-0-2026-69202)

Vulnerability from cvelistv5 – Published: 2026-09-15 19:25 – Updated: 2026-09-15 19:39

Title

Http4s Ember HTTP/2: unbounded inbound body buffering

Summary

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HTTP/2 flow-control window is replenished according to bytes received from the network rather than bytes consumed by the application, while each stream stores DATA in an unbounded channel. A hostile peer can therefore send a body faster than a slow or non-draining application consumes it, retaining payloads in heap on an ember-server or ember-client configured with withHttp2. The patch bounds the per-stream H2Connection body channel so application consumption applies backpressure. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 19:39 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/http4s/http4s/security/advisor…	x_refsource_CONFIRM
https://github.com/http4s/http4s/commit/22d233597…	x_refsource_MISC
https://github.com/http4s/http4s/releases/tag/v0.23.35	x_refsource_MISC
https://github.com/http4s/http4s/releases/tag/v1.…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
http4s	http4s	Affected: < 0.23.35 Affected: >= 1.0.0-M1, < 1.0.0-M47	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-69202

Vulnerability from fkie_nvd - Published: 2026-09-15 20:17 - Updated: 2026-09-16 20:38

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/http4s/http4s/commit/22d2335975d02dc9fb9fb75cfe002279521d86ac
	security-advisories@github.com	https://github.com/http4s/http4s/releases/tag/v0.23.35
	security-advisories@github.com	https://github.com/http4s/http4s/releases/tag/v1.0.0-M47
	security-advisories@github.com	https://github.com/http4s/http4s/security/advisories/GHSA-6m4x-pp6q-5jmm

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
    {
      "affectedData": [
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          "product": "http4s",
          "vendor": "http4s",
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  ],
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  "lastModified": "2026-09-16T20:38:04.943",
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GHSA-6M4X-PP6Q-5JMM

Vulnerability from github – Published: 2026-09-15 19:52 – Updated: 2026-09-15 19:52

Summary

Http4s Ember HTTP/2: unbounded inbound body buffering

Details

Ember's HTTP/2 stack replenishes the inbound flow-control window based on bytes received off the wire, not bytes consumed by the application. Received DATA is buffered in an unbounded per-stream channel. Flow control therefore provides no backpressure: a peer can stream a large or unbounded body faster than the application drains it and the connection retains every payload in heap.

This is the read-path mirror of the outbound queue issue.

This affects an Ember receiving a request body and an Ember client receiving a response body from a hostile server.

Impact

Unauthenticated remote denial of service (OOM) against any Ember server built .withHttp2 for a non-draining or slow-draining route, and against an Ember client consuming from a hostile or compromised server.

Workarounds

Disable HTTP/2 to remove the vector entirely.
Apply an aggregate request-entity size limit (e.g. EntityLimiter middleware) on routes that consume the body.
Ensure handlers fully drain request bodies with aggressive idle timeouts.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

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      "database_specific": {
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      },
      "package": {
        "ecosystem": "Maven",
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      "package": {
        "ecosystem": "Maven",
        "name": "org.http4s:http4s-ember-core_3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.23.35"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.0.0-M46"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.http4s:http4s-ember-core_2.13"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0-M1"
            },
            {
              "fixed": "1.0.0-M47"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.0.0-M46"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.http4s:http4s-ember-core_3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0-M1"
            },
            {
              "fixed": "1.0.0-M47"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-69202"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-15T19:52:58Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "Ember\u0027s HTTP/2 stack replenishes the inbound flow-control window based on bytes\nreceived off the wire, not bytes consumed by the application.  Received DATA is buffered in an unbounded per-stream channel.  Flow control therefore\nprovides no backpressure: a peer can stream a large or unbounded body faster than the application drains it and the connection retains every payload in heap.\n\nThis is the read-path mirror of the [outbound queue issue](https://github.com/http4s/http4s/security/advisories/GHSA-8f3q-3jmv-7prw).\n\nThis affects an Ember receiving a request body and an Ember client receiving a response body from a hostile server.\n\n### Impact\n\nUnauthenticated remote denial of service (OOM) against any Ember server built\n`.withHttp2` for a non-draining or slow-draining route, and against an Ember client consuming from a hostile or compromised server.\n\n### Workarounds\n\n- Disable HTTP/2 to remove the vector entirely.\n- Apply an aggregate request-entity size limit (e.g. `EntityLimiter` middleware) on routes that consume the body.\n- Ensure handlers fully drain request bodies with aggressive idle timeouts.",
  "id": "GHSA-6m4x-pp6q-5jmm",
  "modified": "2026-09-15T19:52:58Z",
  "published": "2026-09-15T19:52:58Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/security/advisories/GHSA-6m4x-pp6q-5jmm"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/commit/22d2335975d02dc9fb9fb75cfe002279521d86ac"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/http4s/http4s"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/releases/tag/v0.23.35"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/releases/tag/v1.0.0-M47"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Http4s Ember HTTP/2: unbounded inbound body buffering"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-69202 (GCVE-0-2026-69202)

FKIE_CVE-2026-69202

GHSA-6M4X-PP6Q-5JMM

Impact

Workarounds

Tags

Sightings

Nomenclature

Related by attack behaviour