High [CVE-2026-102556] Libsoup: libsoup: heap buffer overflow from websocket pong signal type confusion
This high-severity Red Hat Linux advisory covers CVE-2026-102556 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
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. This issue is rated Important.
A remote peer can send a WebSocket Pong that reaches receive_pong(). Exploitation requires an application to connect a::pong handler that expects GBytes; many keep-alive users do.
Successful triggering can crash the process or corrupt heap state. libsoup WebSocket support is used by client and server applications on Red Hat platforms. Red Hat severity: Important — CVSS 8.6 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H).
Weakness: CWE-843. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: libsoup3.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation checklist
- To mitigate avoid connecting custom handlers to SoupWebsocketConnection::pong, or avoid WebSocket use with untrusted peers.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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