GHSA-QXHC-WX3P-2WMG
Vulnerability from github – Published: 2026-05-08 17:13 – Updated: 2026-05-08 17:13
VLAI?
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)
{
"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"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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