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OPENSUSE-SU-2025:20021-1 Not scored

Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues: Changes in MozillaThunderbird: Mozilla Thunderbird 140.3.0 ESR: * Right-clicking 'List-ID' -> 'Unsubscribe' created double encoded draft subject * Thunderbird could crash on startup * Thunderbird could crash when importing mail * Opening Website header link in RSS feed incorrectly re-encoded URL parameters MFSA 2025-78 (bsc#1249391) * CVE-2025-10527 Sandbox escape due to use-after-free in the Graphics: Canvas2D component * CVE-2025-10528 Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component * CVE-2025-10529 Same-origin policy bypass in the Layout component * CVE-2025-10532 Incorrect boundary conditions in the JavaScript: GC component * CVE-2025-10533 Integer overflow in the SVG component * CVE-2025-10536 Information disclosure in the Networking: Cache component * CVE-2025-10537 Memory safety bugs fixed in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143

Exploit probability Not scored
Published October 29, 2025
Required by Not available
Last source change March 23, 2026

02 / AFFECTED SOFTWARE

Affected packages

openSUSE:Leap 16.0 MozillaThunderbird

03 / CONNECTIONS

Connected vulnerabilities

04 / EVIDENCE

Source records

Open Source Vulnerabilities openSUSE-SU-2025:20021-1

This update for MozillaThunderbird fixes the following issues: Changes in MozillaThunderbird: Mozilla Thunderbird 140.3.0 ESR: * Right-clicking 'List-ID' -> 'Unsubscribe' created double encoded draft subject * Thunderbird could crash on startup * Thunderbird could crash when importing mail * Opening Website header link in RSS feed incorrectly re-encoded URL parameters MFSA 2025-78 (bsc#1249391) * CVE-2025-10527 Sandbox escape due to use-after-free in the Graphics: Canvas2D component * CVE-2025-10528 Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component * CVE-2025-10529 Same-origin policy bypass in the Layout component * CVE-2025-10532 Incorrect boundary conditions in the JavaScript: GC component * CVE-2025-10533 Integer overflow in the SVG component * CVE-2025-10536 Information disclosure in the Networking: Cache component * CVE-2025-10537 Memory safety bugs fixed in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143

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05 / REFERENCES

Further evidence