CVE-2026-48779: ws: Memory exhaustion DoS from tiny fragments and data chunks
(updated )
A high volume of exceptionally small fragments and data chunks can be sent by a peer, with modest network traffic, to force the remote peer into allocating and holding structural wrappers that consume far more memory than the default documented message-size limit, leading to process termination due to OOM.
References
- access.redhat.com/errata/RHSA-2026:26638
- access.redhat.com/errata/RHSA-2026:27171
- access.redhat.com/errata/RHSA-2026:29197
- access.redhat.com/errata/RHSA-2026:33155
- access.redhat.com/errata/RHSA-2026:33160
- access.redhat.com/errata/RHSA-2026:33163
- access.redhat.com/errata/RHSA-2026:33173
- access.redhat.com/errata/RHSA-2026:33183
- access.redhat.com/errata/RHSA-2026:33574
- access.redhat.com/errata/RHSA-2026:34342
- access.redhat.com/errata/RHSA-2026:36754
- access.redhat.com/errata/RHSA-2026:36820
- access.redhat.com/errata/RHSA-2026:37272
- access.redhat.com/security/cve/CVE-2026-48779
- bugzilla.redhat.com/show_bug.cgi?id=2489661
- github.com/advisories/GHSA-96hv-2xvq-fx4p
- github.com/websockets/ws/commit/86d3e8a5fb0246ed373860c5fbb0de88824a27f7
- github.com/websockets/ws/commit/b5372ac67bb97a773727b8e9f5035a8123556d53
- github.com/websockets/ws/commit/bca91adf15677e47dbe4f959653452727be28b94
- github.com/websockets/ws/commit/fd36cd864fcdf62a08273a99e19a7d975401fee8
- github.com/websockets/ws/security/advisories/GHSA-96hv-2xvq-fx4p
- nvd.nist.gov/vuln/detail/CVE-2026-48779
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48779.json
Code Behaviors & Features
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