Red Hat Product Errata RHSA-2026:12264 - Security Advisory
Issued:
2026-04-30
Updated:
2026-04-30

RHSA-2026:12264 - Security Advisory

Synopsis

Important: thunderbird security update

Type/Severity

Security Advisory: Important

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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

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/.