Vulnerability-Lookup

GHSA-QXHC-WX3P-2WMG

Vulnerability from github – Published: 2026-05-08 17:13 – Updated: 2026-05-08 17:13

Summary

@fastify/accepts-serializer Vulnerable to Denial of Service via Unbounded Accept Header Cache Growth

Details

Impact

@fastify/accepts-serializer cached serializer-selection results keyed by the request Accept header without a size limit or eviction policy. A remote unauthenticated client could send many distinct but matching Accept header variants to make the cache grow unbounded. Under sustained load, this can exhaust the Node.js heap and crash the process.

Patches

Update to @fastify/accepts-serializer >= 6.0.4. The cache is now bounded by an LRU with a default size of 100 entries, configurable via the new cacheSize plugin option.

Workarounds

None. Upgrade is required.

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

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 6.0.3"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@fastify/accepts-serializer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-7768"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-08T17:13:38Z",
    "nvd_published_at": "2026-05-04T20:16:21Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\n`@fastify/accepts-serializer` cached serializer-selection results keyed by the request `Accept` header without a size limit or eviction policy. A remote unauthenticated client could send many distinct but matching `Accept` header variants to make the cache grow unbounded. Under sustained load, this can exhaust the Node.js heap and crash the process.\n\n### Patches\n\nUpdate to `@fastify/accepts-serializer \u003e= 6.0.4`. The cache is now bounded by an LRU with a default size of 100 entries, configurable via the new `cacheSize` plugin option.\n\n### Workarounds\n\nNone. Upgrade is required.",
  "id": "GHSA-qxhc-wx3p-2wmg",
  "modified": "2026-05-08T17:13:38Z",
  "published": "2026-05-08T17:13:38Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/fastify/fastify-accepts-serializer/security/advisories/GHSA-qxhc-wx3p-2wmg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-7768"
    },
    {
      "type": "WEB",
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/fastify/fastify-accepts-serializer"
    }
  ],
  "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": "@fastify/accepts-serializer Vulnerable to Denial of Service via Unbounded Accept Header Cache Growth"
}

CVE-2026-7768 (GCVE-0-2026-7768)

Vulnerability from cvelistv5 – Published: 2026-05-04 19:14 – Updated: 2026-05-04 19:50

Title

@fastify/accepts-serializer vulnerable to Denial of Service via Unbounded Accept Header Cache Growth

Summary

@fastify/accepts-serializer cached serializer-selection results keyed by the request Accept header without a size limit or eviction policy. A remote unauthenticated client could send many distinct but matching Accept header variants to make the cache grow unbounded, eventually exhausting the Node.js heap and crashing the process. Versions <= 6.0.3 are affected. Update to 6.0.4 or later, which bounds the cache via an LRU with a default size of 100 entries, configurable through the new cacheSize plugin option.

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 2026-05-04 19:50 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

openjs CNA under the redhat root

CNA scorecard C 65/100 over 105 records in the last 180 days details

References

2 references

URL	Tags
https://cna.openjsf.org/security-advisories.html
https://github.com/fastify/fastify-accepts-serial…

Impacted products

1 product

Vendor	Product	Version
@fastify/accepts-serializer	@fastify/accepts-serializer	Affected: 0 , < 6.0.4 (semver) Unaffected: 6.0.4 (semver)

Credits

Yuki Matsuhashi Ulises Gascón Manuel Spigolon

Show details on NVD website

JSON

To clipboard

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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.

Vulnerability timeline

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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.
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