CVE-2026-8959
CVE-2026-8959: 1 tracked advisory record across Red Hat. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
Red Hat
1 advisory- Advisory severityMedium6.1
Medium [CVE-2026-8959] Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component
CVE-2026-8959Source published
Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. Red Hat rates this moderate (CVSS 6.1). Weakness: CWE-653. Affected package(s): thunderbird. Resolved in Red Hat advisory RHSA-2026:21381 — update the affected packages (`sudo dnf update`).
- Related products — impact not confirmed
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Enterprise Linux 1
- thunderbird
- Source-reported affected versions
- thunderbird-0:140.11.0-1.el8_8
- thunderbird-0:140.11.0-1.el9_8
- thunderbird-0:140.11.0-1.el10_2
- thunderbird-0:140.11.0-1.el8_10
6 more entries in the full advisory.
- Source-reported fixed versions
- RHSA-2026:21381
- Mitigation guidance
- Update the affected package(s) to the fixed version shipped in RHSA-2026:21381 (`sudo dnf update` / `yum update`).
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