Affects IBM WebSphere Liberty, widely used enterprise middleware; high-severity cross-server isolation flaw can expose data and processes across co-hosted instances.
CVE-2026-105443
Insufficient isolation between Liberty server instances enabling cross-server access.
Is CVE-2026-105443 being exploited?
Not confirmed. CVE-2026-105443 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.23% probability of exploitation in the next 30 days.
How severe is CVE-2026-105443?
CVE-2026-105443 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-105443?
Not known from our data. No patch reference has been recorded for CVE-2026-105443, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-105443 affect?
CVE-2026-105443 affects IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.10. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-105443?
Monitor vendor advisory, avoid shared installs, restrict access, apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Co-hosted or adjacent Liberty servers can read/modify other servers' data/processes, enabling data exfiltration or privilege escalation.
Patch when possible
- affected>= 17.0.0.3 and <= 26.0.0.10
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.