RHSA-2026:84586HighCVSS 8.6

Red Hat Security Advisory: libsoup security update

Published
October 19, 2026
Last Modified
November 2, 2026

🔗 CVE IDs covered (4)

CVE-2026-102556 →CVE-2026-102557 →CVE-2026-102558 →CVE-2026-102559 →

📋 Description

CVE-2026-102556 — libsoup: libsoup: Heap buffer overflow from WebSocket Pong signal type confusion CVE-2026-102557 — libsoup: libsoup: Heap buffer overflow during WebSocket message reassembly CVE-2026-102558 — libsoup: libsoup: Heap buffer overflow during WebSocket receive-buffer growth CVE-2026-102559 — libsoup: libsoup: Heap buffer overflow during WebSocket client-frame masking

🎯 Affected products33

  • Red Hat Enterprise Linux AppStream (v. 8)
  • Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-0:2.62.3-19.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-0:2.62.3-19.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-0:2.62.3-19.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-0:2.62.3-19.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-0:2.62.3-19.el8_10.src as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-0:2.62.3-19.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-debuginfo-0:2.62.3-19.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libsoup-debuginfo-0:2.62.3-19.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-debuginfo-0:2.62.3-19.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libsoup-debuginfo-0:2.62.3-19.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-debuginfo-0:2.62.3-19.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libsoup-debuginfo-0:2.62.3-19.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-debuginfo-0:2.62.3-19.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libsoup-debuginfo-0:2.62.3-19.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-debuginfo-0:2.62.3-19.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libsoup-debuginfo-0:2.62.3-19.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-debugsource-0:2.62.3-19.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libsoup-debugsource-0:2.62.3-19.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-debugsource-0:2.62.3-19.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libsoup-debugsource-0:2.62.3-19.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-debugsource-0:2.62.3-19.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libsoup-debugsource-0:2.62.3-19.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-debugsource-0:2.62.3-19.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libsoup-debugsource-0:2.62.3-19.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-debugsource-0:2.62.3-19.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libsoup-debugsource-0:2.62.3-19.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libsoup-devel-0:2.62.3-19.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libsoup-devel-0:2.62.3-19.el8_10.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • +3 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: To mitigate avoid connecting custom handlers to SoupWebsocketConnection::pong, or avoid WebSocket use with untrusted peers. Workaround: To mitigate this set a conservative max-total-incoming-message-size / incoming payload limits where the API allows, and do not accept WebSocket connections from untrusted peers. Workaround: To mitigate this configure a finite max-incoming-payload-size (do not set it to 0/unlimited) on SoupWebsocketConnection. Restrict WebSocket exposure to trusted peers. Workaround: To mitigate this enforce application-level limits on outgoing WebSocket message sizes. Do not send untrusted bulk data as a single WebSocket message.

🔗 References (7)