Medium
Undici has an unbounded decompression chain in HTTP responses on Node.js Fetch API via Content-Encoding leads to resource exhaustion
Type: advisorySources: OSV
Undici is an HTTP/1.1 client for Node.js. Prior to 7.18.0 and 6.23.0, the number of links in the decompression chain is unbounded and the default maxHeaderSize allows a malicious server to insert thousands compression steps leading to high CPU usage and excessive memory allocation. This vulnerability is fixed in 7.18.0 and 6.23.0.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-22036
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 05:37 UTC · Revision 1
Source evidence
Undici has an unbounded decompression chain in HTTP responses on Node.js Fetch API via Content-Encoding leads to resource exhaustion
core-osv · Original sourcePublished 14 Jan 2026, 19:07 UTC
Undici is an HTTP/1.1 client for Node.js. Prior to 7.18.0 and 6.23.0, the number of links in the decompression chain is unbounded and the default maxHeaderSize allows a malicious server to insert thousands compression steps leading to high CPU usage and excessive memory allocation. This vulnerability is fixed in 7.18.0 and 6.23.0.
osv:CVE-2026-22036
Complete source record
{
"id": "598969a56020897ddd784851864eac6425946422745e108fc92515d6de0496b0",
"url": "https://osv.dev/vulnerability/CVE-2026-22036",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Undici has an unbounded decompression chain in HTTP responses on Node.js Fetch API via Content-Encoding leads to resource exhaustion",
"summary": "Undici is an HTTP/1.1 client for Node.js. Prior to 7.18.0 and 6.23.0, the number of links in the decompression chain is unbounded and the default maxHeaderSize allows a malicious server to insert thousands compression steps leading to high CPU usage and excessive memory allocation. This vulnerability is fixed in 7.18.0 and 6.23.0.",
"evidence": "osv:CVE-2026-22036",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-22036",
"aliases": [
"CVE-2026-22036",
"GHSA-g9mf-h72j-4rw9"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
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"type": "GIT",
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},
{
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},
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{
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{
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{
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"source": "CPE_RANGE"
},
{
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{
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-22036.json"
}
}
],
"modified": "2026-10-28T02:30:43.136574034Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22036.json",
"https://github.com/nodejs/undici/security/advisories/GHSA-g9mf-h72j-4rw9",
"https://nvd.nist.gov/vuln/detail/CVE-2026-22036",
"https://github.com/nodejs/undici/commit/b04e3cbb569c1596f86c108e9b52c79d8475dcb3"
],
"provider_metadata": {
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],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22036.json"
}
},
"related_cves": [
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 510760,
"published_at": "2026-01-14T19:07:13.745+00:00"
}