Vulnerability-Lookup

CVE-2026-57497 (GCVE-0-2026-57497)

Vulnerability from cvelistv5 – Published: 2026-09-14 16:05 – Updated: 2026-09-14 20:06

Title

webtransport-go: Memory Exhaustion Attack due to Buffering of Unknown Capsules

Summary

webtransport-go is an implementation of the WebTransport protocol. Prior to 0.11.1, Session.parseNextCapsule() in session.go skips an unknown WebTransport capsule on the HTTP/3 request stream by calling io.ReadAll on the capsule reader, retaining the complete declared capsule body in memory. A malicious peer can send a large unknown capsule and cause a client or server to allocate memory for the full payload; QUIC flow control does not bound the total retained allocation because reading advances the flow-control window while the received bytes remain in memory. The resulting memory and resource exhaustion can disrupt or crash the affected process. This issue is fixed in version 0.11.1.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 19:22 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/quic-go/webtransport-go/securi…	x_refsource_CONFIRM
https://github.com/quic-go/webtransport-go/pull/290	x_refsource_MISC
https://github.com/quic-go/webtransport-go/commit…	x_refsource_MISC
https://github.com/quic-go/webtransport-go/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
quic-go	webtransport-go	Affected: < 0.11.1	guessed

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-57497",
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FKIE_CVE-2026-57497

Vulnerability from fkie_nvd - Published: 2026-09-14 17:17 - Updated: 2026-09-14 20:16

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/quic-go/webtransport-go/commit/3aecd11736579530ff067651c30a543eb0b4b8c4
	security-advisories@github.com	https://github.com/quic-go/webtransport-go/pull/290
	security-advisories@github.com	https://github.com/quic-go/webtransport-go/releases/tag/v0.11.1
	security-advisories@github.com	https://github.com/quic-go/webtransport-go/security/advisories/GHSA-g35j-m5xg-vh3q

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "webtransport-go",
          "vendor": "quic-go",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.11.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
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    {
      "lang": "en",
      "value": "webtransport-go is an implementation of the WebTransport protocol. Prior to 0.11.1, Session.parseNextCapsule() in session.go skips an unknown WebTransport capsule on the HTTP/3 request stream by calling io.ReadAll on the capsule reader, retaining the complete declared capsule body in memory. A malicious peer can send a large unknown capsule and cause a client or server to allocate memory for the full payload; QUIC flow control does not bound the total retained allocation because reading advances the flow-control window while the received bytes remain in memory. The resulting memory and resource exhaustion can disrupt or crash the affected process. This issue is fixed in version 0.11.1."
    }
  ],
  "id": "CVE-2026-57497",
  "lastModified": "2026-09-14T20:16:48.567",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
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}

GHSA-G35J-M5XG-VH3Q

Vulnerability from github – Published: 2026-07-24 20:49 – Updated: 2026-07-24 20:49

Summary

webtransport-go: Memory Exhaustion Attack due to Buffering of Unknown Capsules

Details

Summary

An attacker can cause excessive memory allocation in webtransport-go by sending an unknown WebTransport capsule with a large payload. The implementation skips unknown capsules by reading the entire capsule body into memory, instead of draining it without retaining the data. This can lead to memory exhaustion.

Impact

A misbehaving or malicious peer can cause a denial-of-service (DoS) attack against webtransport-go clients or servers by triggering excessive memory allocation, potentially leading to crashes or resource exhaustion.

Details

WebTransport sessions use capsules on the HTTP/3 request stream. Unknown capsule types are ignored, but the capsule body still needs to be consumed before the next capsule can be parsed.

webtransport-go used io.ReadAll when skipping unknown capsules. Since the capsule reader is only limited by the capsule's declared length, a peer could send a large unknown capsule and cause the receiver to allocate memory for the full capsule body.

QUIC flow control limits buffered data, but it does not bound total allocation here, since reading the stream advances the flow control window while retaining the received bytes in memory.

The Fix

webtransport-go now drains unknown capsules to io.Discard instead of buffering them. This consumes the capsule body so parsing can continue, without retaining the payload in memory.

Severity

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.11.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/quic-go/webtransport-go"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.11.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-57497"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-24T20:49:28Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nAn attacker can cause excessive memory allocation in webtransport-go by sending an unknown WebTransport capsule with a large payload. The implementation skips unknown capsules by reading the entire capsule body into memory, instead of draining it without retaining the data. This can lead to memory exhaustion.\n\n## Impact\n\nA misbehaving or malicious peer can cause a denial-of-service (DoS) attack against webtransport-go clients or servers by triggering excessive memory allocation, potentially leading to crashes or resource exhaustion.\n\n## Details\n\nWebTransport sessions use capsules on the HTTP/3 request stream. Unknown capsule types are ignored, but the capsule body still needs to be consumed before the next capsule can be parsed.\n\nwebtransport-go used `io.ReadAll` when skipping unknown capsules. Since the capsule reader is only limited by the capsule\u0027s declared length, a peer could send a large unknown capsule and cause the receiver to allocate memory for the full capsule body.\n\nQUIC flow control limits buffered data, but it does not bound total allocation here, since reading the stream advances the flow control window while retaining the received bytes in memory.\n\n## The Fix\n\nwebtransport-go now drains unknown capsules to `io.Discard` instead of buffering them. This consumes the capsule body so parsing can continue, without retaining the payload in memory.",
  "id": "GHSA-g35j-m5xg-vh3q",
  "modified": "2026-07-24T20:49:28Z",
  "published": "2026-07-24T20:49:28Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/quic-go/webtransport-go/security/advisories/GHSA-g35j-m5xg-vh3q"
    },
    {
      "type": "WEB",
      "url": "https://github.com/quic-go/webtransport-go/pull/290"
    },
    {
      "type": "WEB",
      "url": "https://github.com/quic-go/webtransport-go/commit/3aecd11736579530ff067651c30a543eb0b4b8c4"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/quic-go/webtransport-go"
    },
    {
      "type": "WEB",
      "url": "https://github.com/quic-go/webtransport-go/releases/tag/v0.11.1"
    }
  ],
  "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:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "webtransport-go: Memory Exhaustion Attack due to Buffering of Unknown Capsules"
}

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-2026-57497 (GCVE-0-2026-57497)

FKIE_CVE-2026-57497

GHSA-G35J-M5XG-VH3Q

Summary

Impact

Details

The Fix

Tags

Sightings

Nomenclature

Related by attack behaviour