High [CVE-2026-102558] Libsoup: libsoup: heap buffer overflow during websocket receive-buffer growth
This high-severity Red Hat Linux advisory covers CVE-2026-102558 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 max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could grow its incoming GByteArray based on an attacker-controlled frame length until the length wrapped, causing a heap buffer overflow while reading frame data.
This issue is rated Important. A remote WebSocket peer can cause heap corruption or denial of service, especially when applications leave incoming payload size unlimited.
Default configurations that set a finite max-incoming-payload-size reduce exposure but the vulnerable code path remains relevant for applications that disable the limit. 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-125. 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 this configure a finite max-incoming-payload-size (do not set it to 0/unlimited) on SoupWebsocketConnection. Restrict WebSocket exposure to trusted peers.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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