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CVE-2026-102556— Libsoup: libsoup: heap buffer overflow from websocket pong signal type confusion

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 doc

CVSS 8.6 · High
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I. Basic Information for CVE-2026-102556

Vulnerability Information

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Vulnerability Title
Libsoup: libsoup: heap buffer overflow from websocket pong signal type confusion
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-102556

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III. Intelligence Information for CVE-2026-102556

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Other References for CVE-2026-102556 (2)

Same Patch Batch · Red Hat · 2026-09-29 · 7 CVEs total

CVE-2026-102557 8.6 HIGH Libsoup: libsoup: heap buffer overflow during websocket message reassembly
CVE-2026-95520 7.1 HIGH Rpm: rpm: integer overflow in iterreadarchivenext() leads to heap-based buffer overflow wh
CVE-2026-97024 7.1 HIGH Flatpak: flatpak: arbitrary write in root context via path traversal in deploy directory f
CVE-2026-97029 5.7 MEDIUM Flatpak: flatpak: sandboxed app can signal unsandboxed processes in the same process group
CVE-2026-102473 5.5 MEDIUM Dash: dash: super-polynomial backtracking in pmatch when libc fnmatch is disabled
CVE-2026-102474 4.0 MEDIUM Dash: dash: heap out-of-bounds write in conv_escape via undersized unicode escape reservat

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-843

V. Comments for CVE-2026-102556

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