{"id":"CVE-2026-9679","title":"undici: undici vulnerable to HTTP header injection via Set-Cookie percent-decoding (CVE-2026-9679)","summary":"A flaw was found in undici. The cookie parser in the `parseSetCookie` function incorrectly decodes cookie values, which is contrary to standard specifications. This vulnerability allows an attacker-controlled upstream to inject arbitrary H…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","cvssSource":"vendor","cwe":"CWE-93","vendor":"Red Hat","product":"Red Hat Openshift Data Foundation 4.18","affected":["cryostat 4","openshift_pipelines","amq_broker 7","build_of_podman_desktop","developer_hub","enterprise_linux 10","enterprise_linux 8","enterprise_linux 9","hardened_images","openshift_ai_rhoai","openshift_container_platform 4","openshift_dev_spaces","self_service_automation_portal 2","openshift_data_foundation 4.18"],"patched":["hardened_images","openshift_data_foundation 4.18"],"published":"2026-06-17","updated":"2026-10-01","sourceUpdated":"2026-10-01T17:19:44+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9679.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9679.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-9679"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2490022"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-9679"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9679"},{"url":"https://cna.openjsf.org/security-advisories.html"},{"url":"https://github.com/nodejs/undici/security/advisories/GHSA-p88m-4jfj-68fv"},{"url":"https://access.redhat.com/errata/RHSA-2026:38236"},{"url":"https://access.redhat.com/errata/RHSA-2026:38009"},{"url":"https://access.redhat.com/errata/RHSA-2026:56431"},{"url":"https://github.com/advisories/GHSA-p88m-4jfj-68fv"}],"tags":["csaf","vex","red-hat","ghsa","npm"],"epss":0.00257,"epssPercentile":0.17289,"ecosystem":"npm","ingestedAt":"2026-06-22T15:59:08.196Z","slug":"CVE-2026-9679","body":"## Overview\n\nA flaw was found in undici. The cookie parser in the `parseSetCookie` function incorrectly decodes cookie values, which is contrary to standard specifications. This vulnerability allows an attacker-controlled upstream to inject arbitrary HTTP response headers, such as `Set-Cookie`, `Location`, or `Cache-Control`. The primary consequence is HTTP response header injection, which can lead to session fixation, open redirect, or cache poisoning.\n\n## Vendor advisories\n\n- **RHSA-2026:38236** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:38236)\n- **RHSA-2026:38009** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:38009)\n- **RHSA-2026:56431** · Red Hat · fixed in: Red Hat Openshift Data Foundation 4.18 · released 2026-08-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:56431)\n- **Red Hat VEX** · Moderate · affected: Cryostat 4, OpenShift Pipelines, Red Hat AMQ Broker 7, Red Hat Build of Podman Desktop, Red Hat Developer Hub, Red Hat Enterprise Linux 10, … · no fix planned: Red Hat Hardened Images, Cryostat 4, OpenShift Pipelines, Red Hat AMQ Broker 7, … · updated 2026-10-01 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9679.json)\n\n**undici: undici vulnerable to HTTP header injection via Set-Cookie percent-decoding** — rated Moderate by Red Hat. Released 2026-06-17, updated 2026-10-01.\n\nAffected:\n\n- Cryostat 4\n- OpenShift Pipelines\n- Red Hat AMQ Broker 7\n- Red Hat Build of Podman Desktop\n- Red Hat Developer Hub\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat Hardened Images\n- Red Hat OpenShift AI (RHOAI)\n- Red Hat OpenShift Container Platform 4\n- Red Hat OpenShift Dev Spaces\n- Self-service automation portal 2\n\nFixed:\n\n- Red Hat Hardened Images\n- Red Hat Openshift Data Foundation 4.18\n\nNo fix planned:\n\n- Red Hat Hardened Images\n- Cryostat 4\n- OpenShift Pipelines\n- Red Hat AMQ Broker 7\n- Red Hat Build of Podman Desktop\n- Red Hat Developer Hub\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift AI (RHOAI)\n- Red Hat OpenShift Container Platform 4\n- Red Hat OpenShift Dev Spaces\n- Self-service automation portal 2\n\nNot affected:\n\n- Red Hat Openshift Data Foundation 4.18\n- Red Hat Hardened Images\n\n## Remediation\n\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:38236\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:38009\nBefore applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://docs.redhat.com/en/documentation/red_hat_openshift_data_foundation/4.18/html/updating_openshift_data_foundation/updating-ocs-to-odf_rhodf https://access.redhat.com/errata/RHSA-2026:56431\n\nWorkarounds / mitigations:\n\n- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.\n\n## Package advisory (CVE-2026-9679)\n\nAffected packages:\n\n- `undici < 6.27.0`\n- `undici >= 7.0.0, < 7.28.0`\n- `undici >= 8.0.0, < 8.5.0`\n\nPatched in:\n\n- `undici 6.27.0`\n- `undici 7.28.0`\n- `undici 8.5.0`\n\nSource: https://github.com/advisories/GHSA-p88m-4jfj-68fv","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}