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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. A heap buffer overflow was found in libsoup's client-side WebSocket frame construction / masking path. Outgoing frames are built in a GByteArray. For a send payload larger than the array can represent (at/above ~2^31), g_byte_array_sized_new() / append truncated the length while xor_with_mask() still iterated the full attacker-/caller-controlled length, writing past the small allocation during masking. Fixed by rejecting outgoing payloads above MAX_OUTGOING_PAYLOAD_SIZE both before and after extensions process the payload (commit d7f074f8, libsoup 3.7.3). References: https://gitlab.gnome.org/GNOME/libsoup/-/work_items/554 (Bug 7) https://gitlab.gnome.org/GNOME/libsoup/-/commit/d7f074f8
rawhide and f45 will be fixed by upgrading to 3.8 w/ mclazy f44 and f43 will need a backport of the commit
*** Bug 2543248 has been marked as a duplicate of this bug. ***
FEDORA-2026-6c3a4775a6 (libsoup3-3.6.6-6.fc43) has been submitted as an update to Fedora 43. https://bodhi.fedoraproject.org/updates/FEDORA-2026-6c3a4775a6
FEDORA-2026-f06a7887af (libsoup3-3.6.6-11.fc44) has been submitted as an update to Fedora 44. https://bodhi.fedoraproject.org/updates/FEDORA-2026-f06a7887af
FEDORA-2026-6c3a4775a6 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-2026-6c3a4775a6` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-6c3a4775a6 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-f06a7887af 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-f06a7887af` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-f06a7887af See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-f06a7887af (libsoup3-3.6.6-11.fc44) has been pushed to the Fedora 44 stable repository. If problem still persists, please make note of it in this bug report.