CVE-2026-102559 (GCVE-0-2026-102559)

Vulnerability from cvelistv5 – Published: 2026-09-29 17:15 – Updated: 2026-10-15 16:43
VLAI
Title
Libsoup: libsoup: heap buffer overflow during websocket client-frame masking
Summary
A flaw was found in libsoup. When constructing a masked WebSocket client frame for a very large outgoing payload, size values passed to GByteArray allocation APIs could be truncated while the masking routine still used the full length, causing a heap buffer overflow.
Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 19:42 UTC
CWE
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1036 records in the last 180 days details
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:83384 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:83618 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-102559 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2543285 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version CPE status
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:3.6.5-3.el10_2.20 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:2.72.0-16.el9_8.8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
Create a notification for this product.
Date Public
2026-09-03 00:00
Credits
Red Hat would like to thank Hongduo Zhao for reporting this issue.
Show details on NVD website
To clipboard 

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              "time": "2026-09-03T00:00:00.000Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2026-09-03T00:00:00.000Z",
              "value": "Made public."
            }
          ],
          "title": "Libsoup: libsoup: heap buffer overflow during websocket client-frame masking",
          "workarounds": [
            {
              "lang": "en",
              "value": "To mitigate this enforce application-level limits on outgoing WebSocket message sizes. Do not send untrusted bulk data as a single WebSocket message."
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_redhatCweChain": "CWE-125: Out-of-bounds Read"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2026-102559",
        "datePublished": "2026-09-29T17:15:34.470Z",
        "dateReserved": "2026-09-29T13:19:23.247Z",
        "dateUpdated": "2026-10-15T16:43:16.530Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

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