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Findings

CVE-2026-102559

A flaw was found in libsoup.

Published Sep 29, 2026 · updated Oct 15, 2026 · Red Hat Red Hat Enterprise Linux 9

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.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 29, 2026 · NIST NVD

    Detected

    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.

  2. Oct 15, 2026 · NIST NVD

    Updated

    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.

Affected

  • vendor Red Hat Red Hat Enterprise Linux 10version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 6version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 7version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 8version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 9version unspecified

Sources

  • CIRCL Vulnerability LookupCVE-2026-102559

    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.

    vulnerability.circl.lu
  • CVE.orgCVE-2026-102559

    Official CVE identifier

    cve.org
  • NIST NVDCVE-2026-102559

    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.

    nvd.nist.gov

References