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Description

The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can send a crafted unmasked frame with a payload length near UINT64_MAX to trigger an OOB read in a libsoup-based client when max_incoming_payload_size is set to 0.

PUBLISHED Reserved 2026-06-16 | Published 2026-07-14 | Updated 2026-07-14 | Assigner redhat




MEDIUM: 4.8CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

Problem types

Out-of-bounds Read

Product status

Default status
affected

Timeline

2026-06-16:Reported to Red Hat.
2026-04-27:Made public.

Credits

Red Hat would like to thank Adel Bouachraoui and Gerard Capdevila for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-12478 vdb-entry

access.redhat.com/security/cve/cve-2026-0716 (cve-2026-0716) technical-description

bugzilla.redhat.com/show_bug.cgi?id=2489655 (RHBZ#2489655) issue-tracking

gitlab.gnome.org/GNOME/libsoup/-/merge_requests/518

cve.org (CVE-2026-12478)

nvd.nist.gov (CVE-2026-12478)

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