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CVE-2026-102556

Red Hat Enterprise Linux 10: Libsoup: libsoup: heap buffer overflow from websocket pong signal type confusion

Red Hat Red Hat Enterprise Linux 10Operating systems
Open in ThreatlineRecord JSON
CVSS
8.6High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.27%Chance of exploitation activity in the next 30 days, higher than 18% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published29 Sep 2026Updated 19 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

A flaw was found in libsoup. When handling an incoming WebSocket Pong frame, SoupWebsocketConnection emitted the ::pong signal with a GByteArray pointer even though the signal is declared to pass a GBytes. Applications connecting a handler that follows the documented GBytes API can trigger heap corruption or a crash upon receiving a crafted Pong.

Text from CVE List

Affected versions 3

  • Red Hat Enterprise Linux 10unaffected: 0:3.6.5-3.el10_2.20 and laterCVE List
  • Red Hat Enterprise Linux 8unaffected: 0:2.62.3-19.el8_10 and laterCVE List
  • Red Hat Enterprise Linux 9unaffected: 0:2.72.0-16.el9_8.8 and laterCVE List

References 5