An update for thunderbird is now available for Red Hat Enterprise Linux 8.4
 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions, and Red Hat Enterprise Linux 8.4 Telecommunications Update Service.

Red Hat Product Security has rated this update as having a security impact of
 Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

* firefox: thunderbird: Memory safety bugs fixed in Firefox 135, Thunderbird
 135, Firefox ESR 128.7, and Thunderbird 128.7 (CVE-2025-1017)

* firefox: thunderbird: Use-after-free in Custom Highlight (CVE-2025-1010)

* firefox: thunderbird: Memory safety bugs fixed in Firefox 135, Thunderbird
 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 115.20, and Thunderbird 128.7 (CVE-2025-1016)

* firefox: thunderbird: Potential opening of private browsing tabs in normal
 browsing windows (CVE-2025-1013)

* firefox: thunderbird: A bug in WebAssembly code generation could result in a
 crash (CVE-2025-1011)

* thunderbird: Unsanitized address book fields (CVE-2025-1015)

* firefox: thunderbird: Use-after-free in XSLT (CVE-2025-1009)

* thunderbird: Address of e-mail sender can be spoofed by malicious email
 (CVE-2025-0510)

* firefox: thunderbird: Certificate length was not properly checked
 (CVE-2025-1014)

* firefox: thunderbird: Use-after-free during concurrent delazification
 (CVE-2025-1012)

For more details about the security issue(s), including the impact, a CVSS
 score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

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CVE-2025-0510: User Interface (UI) Misrepresentation of Critical Information
 (CWE-451)
CVE-2025-1009: Use After Free (CWE-416)
CVE-2025-1010: Use After Free (CWE-416)
CVE-2025-1011: Improper Restriction of Operations within the Bounds of a Memory
 Buffer (CWE-119)
CVE-2025-1012: Use After Free (CWE-416)
CVE-2025-1013: Concurrent Execution using Shared Resource with Improper
 Synchronization ('Race Condition') (CWE-362)
CVE-2025-1014: Improper Validation of Specified Quantity in Input (CWE-1284)
CVE-2025-1015: URL Redirection to Untrusted Site ('Open Redirect')
 (CWE-601)
CVE-2025-1016: Buffer Copy without Checking Size of Input ('Classic Buffer
 Overflow') (CWE-120)
CVE-2025-1017: Buffer Copy without Checking Size of Input ('Classic Buffer
 Overflow') (CWE-120)