Low severity3.7NVD Advisory· Published Jun 17, 2026· Updated Jun 27, 2026
CVE-2026-6733
CVE-2026-6733
Description
Impact: Undici's HTTP/1.1 client is vulnerable to response queue poisoning on reused keep-alive sockets. An attacker-controlled upstream server can inject an unsolicited HTTP/1.1 response onto an idle socket after a request completes. When the client dispatches the next request on that socket, it associates the injected response with the new request, causing responses to be delivered to the wrong requests.
This requires an attacker-controlled or compromised upstream HTTP/1.1 server and keep-alive connection reuse.
Patches: Upgrade to undici v6.26.0, v7.28.0 or v8.5.0.
Workarounds: Disable keep-alive connection reuse by setting keepAliveTimeout: 0 on the Client or Pool.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
undicinpm | < 6.27.0 | 6.27.0 |
undicinpm | >= 7.0.0, < 7.28.0 | 7.28.0 |
undicinpm | >= 8.0.0, < 8.5.0 | 8.5.0 |
Affected products
57- osv-coords54 versionspkg:apk/chainguard/actions-runnerpkg:apk/chainguard/code-serverpkg:apk/chainguard/gemini-clipkg:apk/chainguard/harakapkg:apk/chainguard/kibana-8.19pkg:apk/chainguard/kibana-8.19-bitnamipkg:apk/chainguard/kibana-8.19-iamguardedpkg:apk/chainguard/kibana-9.1pkg:apk/chainguard/kibana-9.1-iamguardedpkg:apk/chainguard/kibana-9.2pkg:apk/chainguard/kibana-9.2-iamguardedpkg:apk/chainguard/kibana-9.3pkg:apk/chainguard/kibana-9.3-iamguardedpkg:apk/chainguard/kibana-9.4pkg:apk/chainguard/kibana-9.4-iamguardedpkg:apk/chainguard/node-gyppkg:apk/chainguard/npmpkg:apk/chainguard/pelias-apipkg:apk/chainguard/prismpkg:apk/chainguard/py3.10-captumpkg:apk/chainguard/py3.11-captumpkg:apk/chainguard/py3.12-captumpkg:apk/chainguard/py3.13-captumpkg:apk/chainguard/renovatepkg:apk/chainguard/safpkg:apk/chainguard/vitess-24pkg:apk/wolfi/code-serverpkg:apk/wolfi/node-gyppkg:apk/wolfi/npmpkg:apk/wolfi/prismpkg:apk/wolfi/renovatepkg:apk/wolfi/safpkg:apk/wolfi/vitess-24pkg:rpm/almalinux/nodejspkg:rpm/almalinux/nodejs-develpkg:rpm/almalinux/nodejs-docspkg:rpm/almalinux/nodejs-full-i18npkg:rpm/almalinux/nodejs-libspkg:rpm/almalinux/nodejs-nodemonpkg:rpm/almalinux/nodejs-npmpkg:rpm/almalinux/nodejs-packagingpkg:rpm/almalinux/nodejs-packaging-bundlerpkg:rpm/almalinux/nodejs24pkg:rpm/almalinux/nodejs24-develpkg:rpm/almalinux/nodejs24-docspkg:rpm/almalinux/nodejs24-full-i18npkg:rpm/almalinux/nodejs24-libspkg:rpm/almalinux/nodejs24-npmpkg:rpm/almalinux/npmpkg:rpm/almalinux/v8-12.4-develpkg:rpm/almalinux/v8-13.6-develpkg:rpm/opensuse/nodejs22&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/nodejs24&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/nodejs24&distro=openSUSE%20Tumbleweed
< 2.335.1-r1+ 53 more
- (no CPE)range: < 2.335.1-r1
- (no CPE)range: < 4.125.0-r2
- (no CPE)range: < 0.49.0-r4
- (no CPE)range: < 3.3.1-r1
- (no CPE)range: < 8.19.16-r6
- (no CPE)range: < 8.19.16-r6
- (no CPE)range: < 8.19.16-r6
- (no CPE)range: < 9.1.10-r21
- (no CPE)range: < 9.1.10-r21
- (no CPE)range: < 9.2.8-r9
- (no CPE)range: < 9.2.8-r9
- (no CPE)range: < 9.3.5-r4
- (no CPE)range: < 9.3.5-r4
- (no CPE)range: < 9.4.2-r5
- (no CPE)range: < 9.4.2-r5
- (no CPE)range: < 13.0.0-r1
- (no CPE)range: < 11.17.0-r1
- (no CPE)range: < 7.8.0-r4
- (no CPE)range: < 5.15.11-r3
- (no CPE)range: < 0.9.0-r1
- (no CPE)range: < 0.9.0-r1
- (no CPE)range: < 0.9.0-r1
- (no CPE)range: < 0.9.0-r1
- (no CPE)range: < 43.249.5-r2
- (no CPE)range: < 1.6.0-r2
- (no CPE)range: < 24.0.2-r1
- (no CPE)range: < 4.125.0-r2
- (no CPE)range: < 13.0.0-r1
- (no CPE)range: < 11.17.0-r1
- (no CPE)range: < 5.15.11-r3
- (no CPE)range: < 43.249.5-r2
- (no CPE)range: < 1.6.0-r2
- (no CPE)range: < 24.0.2-r1
- (no CPE)range: < 1:22.23.1-2.el10_2
- (no CPE)range: < 1:22.23.1-2.el10_2
- (no CPE)range: < 1:22.23.1-2.el10_2
- (no CPE)range: < 1:22.23.1-2.el10_2
- (no CPE)range: < 1:22.23.1-2.el10_2
- (no CPE)range: < 3.0.3-3.module_el9.7.0+209+ecf6523e
- (no CPE)range: < 1:10.9.8-1.22.23.1.2.el10_2
- (no CPE)range: < 2021.06-6.module_el9.7.0+209+ecf6523e
- (no CPE)range: < 2021.06-6.module_el9.7.0+209+ecf6523e
- (no CPE)range: < 1:24.18.0-1.el10_2
- (no CPE)range: < 1:24.18.0-1.el10_2
- (no CPE)range: < 1:24.18.0-1.el10_2
- (no CPE)range: < 1:24.18.0-1.el10_2
- (no CPE)range: < 1:24.18.0-1.el10_2
- (no CPE)range: < 1:11.16.0-1.24.18.0.1.el10_2
- (no CPE)range: < 1:11.16.0-1.24.18.0.1.module_el9.8.0+277+61fc613e
- (no CPE)range: < 3:12.4.254.21-1.22.23.1.1.module_el9.8.0+276+8b329b47
- (no CPE)range: < 3:13.6.233.17-1.24.18.0.1.module_el9.8.0+277+61fc613e
- (no CPE)range: < 22.23.0-160000.1.1
- (no CPE)range: < 24.18.0-160000.1.1
- (no CPE)range: < 24.17.0-1.1
Patches
Vulnerability mechanics
References
9- cna.openjsf.org/security-advisories.htmlnvdVendor AdvisoryWEB
- github.com/advisories/GHSA-35p6-xmwp-9g52ghsaADVISORY
- github.com/nodejs/undici/security/advisories/GHSA-35p6-xmwp-9g52nvdMitigationVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-6733ghsaADVISORY
- github.com/nodejs/undici/commit/6ea54ef8c4051e95bb68c89d4a5c9274fe6fbb4bghsaWEB
- github.com/nodejs/undici/releases/tag/v6.27.0ghsaWEB
- github.com/nodejs/undici/releases/tag/v7.28.0ghsaWEB
- github.com/nodejs/undici/releases/tag/v8.5.0ghsaWEB
- hackerone.com/reports/3582376nvdIssue TrackingWEB
News mentions
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