Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-15711
Red Hat Red Hat Enterprise Linux 10 — Libsoup: soupwebsocketconnection: libsoup: websocket remote denial of service via oversized control frame protocol violation
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N U N N H 7.5 .0075 53.2 —
AFFECTED
Product Versions Fixed
Red Hat Enterprise Linux 10 unspecified 0:3.6.5-3.el10_2.14
Red Hat Enterprise Linux 10.0 Extended Update Support unspecified 0:3.6.5-3.el10_0.17
Red Hat Enterprise Linux 8 unspecified 0:2.62.3-15.el8_10
Red Hat Enterprise Linux 8 unspecified 0:2.62.3-15.el8_10
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unspecified 0:2.62.3-2.el8_4.10
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On unspecified 0:2.62.3-2.el8_4.10
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unspecified 0:2.62.3-2.el8_6.10
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On unspecified 0:2.62.3-2.el8_6.10
Red Hat Enterprise Linux 8.8 Telecommunications Update Service unspecified 0:2.62.3-3.el8_8.11
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions unspecified 0:2.62.3-3.el8_8.11
+ 6 more
TIMELINE
Jul 14 Reserved by redhat
Jul 14 Published (CNA: redhat)
Sep 16 PATCH SHIPPED — CVE-2026-15711 (Red Hat Enterprise Linux 10). Fixed in Red Hat Enterprise Linux 10 0:3.6.5-3.el10_2.14.
Description
A vulnerability was found in libsoup's WebSocket frame parsing implementation. The library fails to validate length rules specified in RFC 6455 §5.5, which mandates that all WebSocket control frames (e.g., PING, PONG, CLOSE) contain a payload of 125 bytes or less. A remote, unauthenticated attacker can exploit this by sending a non-compliant, oversized control frame. Because the parser handles this protocol violation improperly instead of throwing an immediate connection termination error, it triggers a internal processing crash, resulting in a remote denial of service (DoS) for applications utilizing libsoup WebSockets.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| July 14, 2026 | Reserved | Reserved by redhat |
| July 14, 2026 | Published | Published (CNA: redhat) |
| September 16, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-15711 (Red Hat Enterprise Linux 10). Fixed in Red Hat Enterprise Linux 10 0:3.6.5-3.el10_2.14. |
Affected
Affected products and packages — 16 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — | 0:3.6.5-3.el10_2.14 |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — | — | 0:3.6.5-3.el10_0.17 |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | 0:2.62.3-15.el8_10 |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | 0:2.62.3-15.el8_10 |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | — | — | 0:2.62.3-2.el8_4.10 |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | — | — | 0:2.62.3-2.el8_4.10 |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | — | — | 0:2.62.3-2.el8_6.10 |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | — | — | 0:2.62.3-2.el8_6.10 |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | — | — | 0:2.62.3-3.el8_8.11 |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | — | — | 0:2.62.3-3.el8_8.11 |
| Red Hat | Red Hat Enterprise Linux 9 | — | — | 0:2.72.0-16.el9_8.3 |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | — | — | 0:2.72.0-8.el9_2.13 |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | — | — | 0:2.72.0-8.el9_4.12 |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — | — | 0:2.72.0-10.el9_6.9 |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-15711 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 Sunday, October 4, 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.
