CVE-2026-102557
Libsoup: libsoup: heap buffer overflow during websocket message reassembly
CVSS Score
8.6
EPSS Score
0.5%
EPSS Percentile
41th
A flaw was found in libsoup. When reassembling fragmented WebSocket messages into a GByteArray, libsoup did not adequately cap total message size against the limits of the underlying buffer type. A remote peer could send fragments that caused size truncation while the implementation still used the full length, leading to heap corruption or a crash.
| CWE | CWE-125 |
| Vendor | red hat |
| Product | red hat enterprise linux 10 |
| Published | Sep 29, 2026 |
| Last Updated | Nov 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High
Affected Versions
Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:83384 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:83618 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:84586 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:92347 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:93445 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:93446 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:93447 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:93465 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:93466 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:93583 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:93716 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:98453 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:98560 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-102557 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2543231
Credits
Red Hat would like to thank Hongduo Zhao for reporting this issue.