Red Hat Product Errata RHSA-2026:12264 - Security Advisory Issued: 2026-04-30 Updated: 2026-04-30 RHSA-2026:12264 - Security Advisory Overview Updated Packages Synopsis Important: thunderbird security update Type/Severity Security Advisory: Important Red Hat Lightspeed patch analysis Identify and remediate systems affected by this advisory. View affected systems Topic An update for thunderbird is now available for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions. 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 Thunderbird is a standalone mail and newsgroup client. Security Fix(es): libpng: libpng: Arbitrary code execution due to use-after-free vulnerability (CVE-2026-33416) libpng: libpng: Information disclosure and denial of service via out-of-bounds read/write in Neon palette expansion (CVE-2026-33636) thunderbird: firefox: Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2 (CVE-2026-5734) thunderbird: firefox: Memory safety bugs fixed in Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2 (CVE-2026-5731) firefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics: Text component (CVE-2026-5732) 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 for Power LE - Update Services for SAP Solutions 9.0 ppc64le Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.0 x86_64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.0 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.0 s390x Fixes BZ - 2451805 - CVE-2026-33416 libpng: libpng: Arbitrary code execution due to use-after-free vulnerability BZ - 2451819 - CVE-2026-33636 libpng: libpng: Information disclosure and denial of service via out-of-bounds read/write in Neon palette expansion BZ - 2455897 - CVE-2026-5734 thunderbird: firefox: Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2 BZ - 2455901 - CVE-2026-5731 thunderbird: firefox: Memory safety bugs fixed in Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2 BZ - 2455908 - CVE-2026-5732 firefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics: Text component CVEs CVE-2026-5731 CVE-2026-5732 CVE-2026-5734 CVE-2026-33416 CVE-2026-33636 References https://access.redhat.com/security/updates/classification/#important Note: More recent versions of these packages may be available. Click a package name for more details. Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.0 SRPM thunderbird-140.9.1-1.el9_0.src.rpm SHA-256: 15db3cf6f9dd4a1603a710af52e2ab95cde2889fc1aecca0f888961182f6f4de ppc64le thunderbird-140.9.1-1.el9_0.ppc64le.rpm SHA-256: 6eca85413093807b078c2384606e4585d96cf3b9a92a85f9a08809abd17325e9 thunderbird-debuginfo-140.9.1-1.el9_0.ppc64le.rpm SHA-256: fb68c4ead8088198d0ee47b18bd43c27e01669282e0331ea5eeea7e43f784d6d thunderbird-debugsource-140.9.1-1.el9_0.ppc64le.rpm SHA-256: 74107beaa3d2873be890f429b41de20a3b45b1629279a8f7e4829acf45ff4537 Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.0 SRPM thunderbird-140.9.1-1.el9_0.src.rpm SHA-256: 15db3cf6f9dd4a1603a710af52e2ab95cde2889fc1aecca0f888961182f6f4de x86_64 thunderbird-140.9.1-1.el9_0.x86_64.rpm SHA-256: 7f5686880bfc71de4b771c747c0782e685ac76f3fc89bdb0ef2e25f375ed62fa thunderbird-debuginfo-140.9.1-1.el9_0.x86_64.rpm SHA-256: 29afa1e9030f5ec8a51f89ef7fa1f3658215c905a1c543e466d72aa1c654342a thunderbird-debugsource-140.9.1-1.el9_0.x86_64.rpm SHA-256: f31d775e46dd5902d6e50dbaf84f4a222a48f758f7c986a36e4307e5e690c35e Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.0 SRPM thunderbird-140.9.1-1.el9_0.src.rpm SHA-256: 15db3cf6f9dd4a1603a710af52e2ab95cde2889fc1aecca0f888961182f6f4de aarch64 thunderbird-140.9.1-1.el9_0.aarch64.rpm SHA-256: ce89d4ddb471cc89c9154f7d5aee0f1cbf49d1c630bd7ffcca660a6d0945da8f thunderbird-debuginfo-140.9.1-1.el9_0.aarch64.rpm SHA-256: df7f50f4d97f20684e5ab90f8197baf6c0db7a989fe613212593bd688d4351df thunderbird-debugsource-140.9.1-1.el9_0.aarch64.rpm SHA-256: 2189257c0b3ee75388a66bbbafedcb7b639d7e339f368263df38d92b41ef269e Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.0 SRPM thunderbird-140.9.1-1.el9_0.src.rpm SHA-256: 15db3cf6f9dd4a1603a710af52e2ab95cde2889fc1aecca0f888961182f6f4de s390x thunderbird-140.9.1-1.el9_0.s390x.rpm SHA-256: 0bc63ea05d95572fb4decab5005c520697bb7b792a6d77ae6b3e4ca12c784e88 thunderbird-debuginfo-140.9.1-1.el9_0.s390x.rpm SHA-256: 96df0f5415dc0828c4d337588cd025791f467f618e2834c2cf9c4245a727fd26 thunderbird-debugsource-140.9.1-1.el9_0.s390x.rpm SHA-256: 2443d21a51357827ef027f222ecbb7c83c246800c540dcd914a2c4fb767be31e The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .