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node-undici — security advisory

Type: advisorySources: OSVAdvisory ID: UBUNTU-CVE-2026-85152

undici 8.10.0 omits the destination origin from the cache and request-deduplication keys when the cache or deduplicate interceptor is composed directly onto a Client or Pool. Because the internal cache key falls back to an empty origin string, a cacheable or in-flight response from one upstream origin is returned for a request to a different, trusted origin whenever the method, path, and relevant headers match, which permits cross-origin information disclosure and persistent cache poisoning. The reporter demonstrated a full authentication bypass in which a JWT signed with an attacker-controlled key was accepted as belonging to a trusted issuer, and the trusted origin was never contacted. This is a regression introduced in 8.10.0 and affects undici versions from 8.10.0 up to 8.10.2. Applications using an Agent, which carries the origin in its dispatch options, are not affected. Users should upgrade to undici 8.10.2.

Products
node-undici
Affected versions
5.22.1+dfsg1+~cs20.10.10.2-1ubuntu1, 5.26.3+dfsg1+~cs23.10.12-2, 7.16.0+dfsg+~cs3.2.0-2, 7.18.2+dfsg+~cs3.2.0-1, 7.18.2+dfsg+~cs3.2.0-1build1, 7.24.6+dfsg+~cs3.2.0-3, 7.3.0+dfsg1+~cs24.12.11-2, 8.5.0+dfsg+~cs3.2.0-2, 8.5.0+dfsg+~cs3.2.0-3, 8.9.0+dfsg+~cs3.2.0-1
Fixed versions
Not specified
CVEs
CVE-2026-85152
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 03:23 UTC · Revision 1

Source evidence

UBUNTU-CVE-2026-85152

core-osv · Original source

Published 4 Sept 2026, 17:17 UTC

undici 8.10.0 omits the destination origin from the cache and request-deduplication keys when the cache or deduplicate interceptor is composed directly onto a Client or Pool. Because the internal cache key falls back to an empty origin string, a cacheable or in-flight response from one upstream origin is returned for a request to a different, trusted origin whenever the method, path, and relevant headers match, which permits cross-origin information disclosure and persistent cache poisoning. The reporter demonstrated a full authentication bypass in which a JWT signed with an attacker-controlled key was accepted as belonging to a trusted issuer, and the trusted origin was never contacted. This is a regression introduced in 8.10.0 and affects undici versions from 8.10.0 up to 8.10.2. Applications using an Agent, which carries the origin in its dispatch options, are not affected. Users should upgrade to undici 8.10.2.

osv:UBUNTU-CVE-2026-85152

node-undici

Fixed versions: Not specified

node-undici

Fixed versions: Not specified

node-undici

Fixed versions: Not specified

Complete source record
{
  "id": "7c6405c4b448e766d8275a7ed5e66e24dfeaf17aad34bb062621e9866762b84d",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-85152",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-85152",
    "summary": "undici 8.10.0 omits the destination origin from the cache and request-deduplication keys when the cache or deduplicate interceptor is composed directly onto a Client or Pool. Because the internal cache key falls back to an empty origin string, a cacheable or in-flight response from one upstream origin is returned for a request to a different, trusted origin whenever the method, path, and relevant headers match, which permits cross-origin information disclosure and persistent cache poisoning. The reporter demonstrated a full authentication bypass in which a JWT signed with an attacker-controlled key was accepted as belonging to a trusted issuer, and the trusted origin was never contacted. This is a regression introduced in 8.10.0 and affects undici versions from 8.10.0 up to 8.10.2. Applications using an Agent, which carries the origin in its dispatch options, are not affected. Users should upgrade to undici 8.10.2.",
    "evidence": "osv:UBUNTU-CVE-2026-85152",
    "products": [
      {
        "name": {
          "value": "node-undici",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "5.22.1+dfsg1+~cs20.10.10.2-1ubuntu1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "5.26.3+dfsg1+~cs23.10.12-2",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "node-undici",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "7.18.2+dfsg+~cs3.2.0-1build1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "7.24.6+dfsg+~cs3.2.0-3",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.5.0+dfsg+~cs3.2.0-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.5.0+dfsg+~cs3.2.0-3",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.9.0+dfsg+~cs3.2.0-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "node-undici",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "7.3.0+dfsg1+~cs24.12.11-2",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "7.16.0+dfsg+~cs3.2.0-2",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "7.18.2+dfsg+~cs3.2.0-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "7.18.2+dfsg+~cs3.2.0-1build1",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "UBUNTU-CVE-2026-85152",
      "aliases": [
        "UBUNTU-CVE-2026-85152"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "node-undici",
            "purl": "pkg:deb/ubuntu/node-undici?arch=source&distro=noble",
            "ecosystem": "Ubuntu:24.04:LTS"
          },
          "versions": [
            "5.22.1+dfsg1+~cs20.10.10.2-1ubuntu1",
            "5.26.3+dfsg1+~cs23.10.12-2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85152.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "node-llhttp",
                "binary_version": "9.1.3~5.26.3+dfsg1+~cs23.10.12-2"
              },
              {
                "binary_name": "node-undici",
                "binary_version": "5.26.3+dfsg1+~cs23.10.12-2"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "node-undici",
            "purl": "pkg:deb/ubuntu/node-undici?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "7.18.2+dfsg+~cs3.2.0-1build1",
            "7.24.6+dfsg+~cs3.2.0-3",
            "8.5.0+dfsg+~cs3.2.0-2",
            "8.5.0+dfsg+~cs3.2.0-3",
            "8.9.0+dfsg+~cs3.2.0-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85152.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "node-undici",
                "binary_version": "8.9.0+dfsg+~cs3.2.0-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "node-undici",
            "purl": "pkg:deb/ubuntu/node-undici?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "7.3.0+dfsg1+~cs24.12.11-2",
            "7.16.0+dfsg+~cs3.2.0-2",
            "7.18.2+dfsg+~cs3.2.0-1",
            "7.18.2+dfsg+~cs3.2.0-1build1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85152.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "node-undici",
                "binary_version": "7.18.2+dfsg+~cs3.2.0-1build1"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T13:01:13.364115108Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-85152"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-85152",
        "https://www.cve.org/CVERecord?id=CVE-2026-85152",
        "https://github.com/nodejs/undici/security/advisories/GHSA-vp8m-p9jh-q5pm"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-85152",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 361290,
  "published_at": "2026-09-04T17:17:00+00:00"
}