Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
websockets ws — ws: Memory exhaustion DoS from tiny fragments and data chunks
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N U N N H 7.5 .0078 53.2 —
AFFECTED
Product Versions Fixed
ws >= 1.1.0, < 5.2.5 – —
TIMELINE
May 22 Reserved by GitHub_M
Jun 16 EXPLOIT PUBLISHED — CVE-2026-48779 (websockets ws). Public exploit reference added.
Jun 16 Published (CNA: GitHub_M)
Description
ws is an open source WebSocket client and server for Node.js. All versions from 1.1.0 up to (but not including) 5.2.5, from 6.0.0 up to 6.2.4, from 7.0.0 up to 7.5.11, and from 8.0.0 up to 8.21.0 are affected by a memory exhaustion DoS vulnerability. A peer can send a high volume of exceptionally small fragments and data chunks, 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. This issue has been fixed in versions 5.2.5, 6.2.4, 7.5.11, and 8.21.0.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| May 22, 2026 | Reserved | Reserved by GitHub_M |
| June 16, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-48779 (websockets ws). Public exploit reference added. |
| June 16, 2026 | Published | Published (CNA: GitHub_M) |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| websockets | ws | — | >= 1.1.0, < 5.2.5 | — |
References (26)
- https://access.redhat.com/errata/RHSA-2026:29197 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:33155 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:33160 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:33163 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:33173 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:33183 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:33574 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:34342 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:36754 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:36820 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:37272 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:40984 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:41928 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:41941 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:41944 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:48151 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:56366 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/errata/RHSA-2026:56431 [vendor-advisory, x_refsource_REDHAT]
- https://access.redhat.com/security/cve/CVE-2026-48779 [vdb-entry, x_refsource_REDHAT]
- https://bugzilla.redhat.com/show_bug.cgi?id=2489661 [issue-tracking, x_refsource_REDHAT]
- https://github.com/websockets/ws/commit/86d3e8a5fb0246ed373860c5fbb0de88824a27f7 [x_refsource_MISC]
- https://github.com/websockets/ws/commit/b5372ac67bb97a773727b8e9f5035a8123556d53 [x_refsource_MISC]
- https://github.com/websockets/ws/commit/bca91adf15677e47dbe4f959653452727be28b94 [x_refsource_MISC]
- https://github.com/websockets/ws/commit/fd36cd864fcdf62a08273a99e19a7d975401fee8 [x_refsource_MISC]
- https://github.com/websockets/ws/security/advisories/GHSA-96hv-2xvq-fx4p [x_refsource_CONFIRM]
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48779.json [x_sadp-csaf-vex]
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-48779 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.