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.
Red Hat Red Hat Enterprise Linux 10 — Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions
AV AC PR UI S C I A CVSS EPSS %ile KEV
L L N R U H L N 6.1 .0009 0.5 —
AFFECTED
Product Versions Fixed
Red Hat Enterprise Linux 10 unspecified 0:9.9p1-25.el10_2
Red Hat Enterprise Linux 8 unspecified 0:8.0p1-30.el8_10
Red Hat Enterprise Linux 8 unspecified 0:8.0p1-30.el8_10
Red Hat Enterprise Linux 9 unspecified 0:9.9p1-9.el9_8
Red Hat Enterprise Linux 9 unspecified 0:9.9p1-9.el9_8
Red Hat Hardened Images unspecified 10.3p1-6.hum1
Red Hat Update Infrastructure 5 unspecified 1786435483
Red Hat Update Infrastructure 5 unspecified 1786533529
Red Hat Enterprise Linux 6 unspecified —
Red Hat Enterprise Linux 7 unspecified —
+ 1 more
TIMELINE
Jun 16 Reserved by redhat
Jun 23 Published (CNA: redhat)
Aug 12 RESCORED — CVE-2026-55655 (Red Hat Enterprise Linux 10). CVSS 5 → 6.1 (NVD).
Description
A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by pre-binding the preferred abstract X socket name when X11 forwarding is enabled and a local UNIX-domain X socket is used. A successful attack can compromise the confidentiality of forwarded X11 traffic, including sensitive window contents and input, and may allow some manipulation of the forwarded session.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| June 16, 2026 | Reserved | Reserved by redhat |
| June 23, 2026 | Published | Published (CNA: redhat) |
| August 12, 2026 | RESCORED | RESCORED — CVE-2026-55655 (Red Hat Enterprise Linux 10). CVSS 5 → 6.1 (NVD). |
Affected
Affected products and packages — 11 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — | 0:9.9p1-25.el10_2 |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | 0:8.0p1-30.el8_10 |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | 0:8.0p1-30.el8_10 |
| Red Hat | Red Hat Enterprise Linux 9 | — | — | 0:9.9p1-9.el9_8 |
| Red Hat | Red Hat Enterprise Linux 9 | — | — | 0:9.9p1-9.el9_8 |
| Red Hat | Red Hat Hardened Images | — | — | 10.3p1-6.hum1 |
| Red Hat | Red Hat Update Infrastructure 5 | — | — | 1786435483 |
| Red Hat | Red Hat Update Infrastructure 5 | — | — | 1786533529 |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-55655 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.