An update for firefox is now available for Red Hat Enterprise Linux 9.4
 Extended Update 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.

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

Security Fix(es):

* firefox: Use-after-free when breaking lines in text (CVE-2025-0238)

* firefox: Memory corruption when using JavaScript Text Segmentation
 (CVE-2025-0241)

* firefox: Alt-Svc ALPN validation failure when redirected (CVE-2025-0239)

* firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird
 134, Firefox ESR 128.6, and Thunderbird 128.6 (CVE-2025-0243)

* firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird
 134, Firefox ESR 115.19, Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6 (CVE-2025-0242)

* firefox: WebChannel APIs susceptible to confused deputy attack
 (CVE-2025-0237)

* firefox: Compartment mismatch when parsing JavaScript JSON module
 (CVE-2025-0240)

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.

This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2025-0237: Unintended Proxy or Intermediary ('Confused Deputy')
 (CWE-441)
CVE-2025-0238: Use After Free (CWE-416)
CVE-2025-0239: URL Redirection to Untrusted Site ('Open Redirect')
 (CWE-601)
CVE-2025-0240: Use After Free (CWE-416)
CVE-2025-0241: Improper Restriction of Operations within the Bounds of a Memory
 Buffer (CWE-119)
CVE-2025-0242: Buffer Copy without Checking Size of Input ('Classic Buffer
 Overflow') (CWE-120)
CVE-2025-0243: Buffer Copy without Checking Size of Input ('Classic Buffer
 Overflow') (CWE-120)