All vulnerabilities
CVE-2026-102557

Red Hat Enterprise Linux 10: Libsoup: libsoup: heap buffer overflow during websocket message reassembly

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 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.

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