RHSA-2025:8465 - Security Advisory

Topic

An update for firefox is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support.

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.

Description

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.

Security Fix(es):

• firefox: thunderbird: Out-of-bounds access when resolving Promise objects (CVE-2025-4918)
• firefox: thunderbird: Out-of-bounds access when optimizing linear sums (CVE-2025-4919)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server - Extended Life Cycle Support 7 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 7 s390x

Fixes

• BZ - 2367016 - CVE-2025-4918 firefox: thunderbird: Out-of-bounds access when resolving Promise objects
• BZ - 2367018 - CVE-2025-4919 firefox: thunderbird: Out-of-bounds access when optimizing linear sums

CVEs

• CVE-2025-4918
• CVE-2025-4919

References

• https://access.redhat.com/security/updates/classification/#important