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Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process. nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A backend that resolves the resulting ambiguous message in the attacker's favor enables HTTP request/response smuggling and cross-client response-queue poisoning.
FEDORA-2026-084c991d17 (nghttp2-1.68.0-5.fc44) has been submitted as an update to Fedora 44. https://bodhi.fedoraproject.org/updates/FEDORA-2026-084c991d17
FEDORA-2026-91dd0c29d6 (nghttp2-1.66.0-3.fc43) has been submitted as an update to Fedora 43. https://bodhi.fedoraproject.org/updates/FEDORA-2026-91dd0c29d6
FEDORA-2026-084c991d17 has been pushed to the Fedora 44 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-084c991d17` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-084c991d17 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-91dd0c29d6 has been pushed to the Fedora 43 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-91dd0c29d6` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-91dd0c29d6 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-084c991d17 (nghttp2-1.68.0-5.fc44) has been pushed to the Fedora 44 stable repository. If problem still persists, please make note of it in this bug report.
FEDORA-2026-91dd0c29d6 (nghttp2-1.66.0-3.fc43) has been pushed to the Fedora 43 stable repository. If problem still persists, please make note of it in this bug report.