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Alerts This Week
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Mageia: Critical Sandbox Escape and Information Disclosure MGASA-2026-0014

mageia
Calendar Grey January 20, 2026
Dist Mageia Esm H88
Updated Thunderbird packages in Mageia fix multiple security issues including sandbox escapes and information disclosure.
MGASA-2026-0014 - Updated thunderbird packages fix security vulnerabilities

Summary

Description: Mitigation bypass in the DOM: Security component. (CVE-2026-0877) Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. (CVE-2026-0878) Sandbox escape due to incorrect boundary conditions in the Graphics component. (CVE-2026-0879) Sandbox escape due to integer overflow in the Graphics component. (CVE-2026-0880) Use-after-free in the IPC component. (CVE-2026-0882) Spoofing issue in the Downloads Panel component. (CVE-2025-14327) Information disclosure in the Networking component. (CVE-2026-0883) Use-after-free in the JavaScript Engine component. (CVE-2026-0884) Use-after-free in the JavaScript: GC component. (CVE-2026-0885) Incorrect boundary conditions in the Graphics component. (CVE-2026-0886) Clickjacking issue, information disclosure in the PDF Viewer component. (CVE-2026-0887) Spoofing issue in the DOM: Copy & Paste and Drag & Drop component. (CVE-2026-0890) Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, F...

References

- https://bugs.mageia.org/show_bug.cgi?id=34993

- https://www.thunderbird.net/en-US/thunderbird/140.7.0esr/releasenotes/

- https://www.mozilla.org/en-US/security/advisories/mfsa2026-05/

- https://www.cve.org/CVERecord?id=CVE-2026-0877

- https://www.cve.org/CVERecord?id=CVE-2026-0878

- https://www.cve.org/CVERecord?id=CVE-2026-0879

- https://www.cve.org/CVERecord?id=CVE-2026-0880

- https://www.cve.org/CVERecord?id=CVE-2026-0882

- https://www.cve.org/CVERecord?id=CVE-2025-14327

- https://www.cve.org/CVERecord?id=CVE-2026-0883

- https://www.cve.org/CVERecord?id=CVE-2026-0884

- https://www.cve.org/CVERecord?id=CVE-2026-0885

- https://www.cve.org/CVERecord?id=CVE-2026-0886

- https://www.cve.org/CVERecord?id=CVE-2026-0887

- https://www.cve.org/CVERecord?id=CVE-2026-0890

- https://www.cve.org/CVERecord?id=CVE-2026-0891

Topics%20covered

Topics Covered

security advisory important information disclosure thunderbird sandbox escape Mageia

Resolution

SRPMS

- 9/core/thunderbird-140.7.0-1.mga9

- 9/core/thunderbird-l10n-140.7.0-1.mga9

Severity
important
Lowest
Low
Medium
High
Critical

Publication date: 20 Jan 2026
URL: https://advisories.mageia.org/MGASA-2026-0014.html
Type: security
CVE: CVE-2026-0877, CVE-2026-0878, CVE-2026-0879, CVE-2026-0880, CVE-2026-0882, CVE-2025-14327, CVE-2026-0883, CVE-2026-0884, CVE-2026-0885, CVE-2026-0886, CVE-2026-0887, CVE-2026-0890, CVE-2026-0891

Topics%20covered

Topics Covered

security advisory important information disclosure thunderbird sandbox escape Mageia

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