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Red Hat released multiple Firefox security advisories for RHEL 7 and several RHEL 8 support channels, upgrading the browser to Firefox 115.11.0 ESR to remediate six Mozilla flaws. The updates cover product streams including RHEL 7 variants and RHEL 8.2, 8.4, and 8.10 across architectures such as x86_64, ppc64le, s390x, and aarch64, with severity ratings ranging from Important to Moderate depending on the platform and channel.
The patched issues include CVE-2024-4777, a set of memory safety bugs that Mozilla said showed evidence of memory corruption and could potentially lead to arbitrary code execution; CVE-2024-4770, a use-after-free that could be triggered while printing or saving pages to PDF; CVE-2024-4769, a cross-origin information disclosure side channel in Web Workers; CVE-2024-4768, a clickjacking-related permissions bypass involving WebAuthn prompts; and CVE-2024-4767, which could leave IndexedDB files behind after private browsing sessions in certain configurations. Red Hat advised customers to apply prerequisite errata where required before installing the Firefox update.
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13 events from the most recent confirmed update back to the earliest known activity.
On 2024-06-10, Red Hat published RHSA-2024:3783, a Moderate Firefox security update for Red Hat Enterprise Linux 8 and 8.10 Extended Life Cycle variants across x86_64, s390x, ppc64le, and aarch64, upgrading Firefox to 115.11.0 ESR and addressing the same six vulnerabilities.
On 2024-05-20, Red Hat published RHSA-2024:2906, an Important Firefox security update for Red Hat Enterprise Linux 9.2 support channels. The advisory upgraded Firefox to 115.11.0 ESR across multiple architectures and fixed six vulnerabilities including CVE-2024-4367, CVE-2024-4767, CVE-2024-4768, CVE-2024-4769, CVE-2024-4770, and CVE-2024-4777.
On 2024-05-16, Red Hat published RHSA-2024:2884, an Important Firefox security update for Red Hat Enterprise Linux 9.0 Extended Update Support and related service variants. The advisory upgraded Firefox to 115.11.0 ESR and fixed six vulnerabilities including CVE-2024-4367, CVE-2024-4767, CVE-2024-4768, CVE-2024-4769, CVE-2024-4770, and CVE-2024-4777.
On 2024-05-16, Red Hat published RHSA-2024:2885, an Important Firefox security update for multiple Red Hat Enterprise Linux 8.8 support channels, upgrading Firefox to 115.11.0 ESR. The advisory addressed six vulnerabilities including CVE-2024-4367, CVE-2024-4767, CVE-2024-4768, CVE-2024-4769, CVE-2024-4770, and CVE-2024-4777.
On 2024-05-16, Red Hat published RHSA-2024:2887, an Important Firefox security update for multiple Red Hat Enterprise Linux 8.6 support channels including EUS, AUS, TUS, ELLL, and SAP Solutions services. The advisory upgraded Firefox to 115.11.0 ESR and fixed six vulnerabilities including CVE-2024-4367, CVE-2024-4767, CVE-2024-4768, CVE-2024-4769, CVE-2024-4770, and CVE-2024-4777.
On 2024-05-16, Red Hat published RHSA-2024:2886, an Important Firefox security update for multiple Red Hat Enterprise Linux 8.4 service channels including AUS, TUS, EUS/ELLL, and SAP update services, upgrading Firefox to 115.11.0 ESR and fixing six vulnerabilities.
On 2024-05-16, Red Hat published RHSA-2024:2882, an Important Firefox security update for Red Hat Enterprise Linux 8.2 Advanced Update Support that upgraded Firefox to 115.11.0 ESR and addressed the same six Firefox vulnerabilities.
On 2024-05-16, Red Hat published RHSA-2024:2881, an Important Firefox security update for Red Hat Enterprise Linux 7 that upgraded Firefox to 115.11.0 ESR and fixed six vulnerabilities including CVE-2024-4367, CVE-2024-4767, CVE-2024-4768, CVE-2024-4769, CVE-2024-4770, and CVE-2024-4777.
Mozilla disclosed CVE-2024-4777 on 2024-05-14 as a set of memory safety bugs affecting Firefox 125, Firefox ESR 115.10, and Thunderbird 115.10; Mozilla said some bugs showed memory corruption and might enable arbitrary code execution with enough effort.
Mozilla disclosed CVE-2024-4770 on 2024-05-14 as a potential use-after-free vulnerability that could be triggered when saving a page to PDF with certain font styles.
Mozilla disclosed CVE-2024-4769 on 2024-05-14, describing an information disclosure issue in Web Workers where error handling could distinguish script from non-script cross-origin responses.
Mozilla disclosed CVE-2024-4768 on 2024-05-14 as a clickjacking-related permissions bypass issue involving popup notifications' interaction with WebAuthn that could help trick users into granting permissions.
Mozilla disclosed CVE-2024-4767 on 2024-05-14, describing a privacy issue where IndexedDB files could remain after closing a private browsing window when the browser.privatebrowsing.autostart preference was enabled.
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Red Hat released **Important** Firefox security updates for **Red Hat Enterprise Linux 8, 9, and 10**, updating the browser to the `140.14.0` package stream across standard, extended support, and lifecycle variants on `x86_64`, `s390x`, `ppc64le`, and `aarch64`. The advisories say the updates remediate **31 Mozilla Firefox vulnerabilities** spanning privilege escalation, use-after-free, information disclosure, same-origin policy bypass, site isolation flaws, mitigation bypasses, integer overflow, and JIT miscompilation issues. The fixed issues include CVEs in the `CVE-2026-74934` to `CVE-2026-74990` range, with examples such as `CVE-2026-74983`, `CVE-2026-74953`, `CVE-2026-74976`, and `CVE-2026-74990`. Red Hat said affected components include **CanvasWebGL, Cookies, Graphics, WebAssembly, WebExtensions, DOM, Safe Browsing, and Remote Settings Client**, while related downstream tracking appeared in Rocky Linux through `RLSA-2026:58898`, indicating corresponding ecosystem patching for Firefox on enterprise Linux platforms.
Aug 27, 2026
Red Hat released **RHSA-2026:58550** for `webkit2gtk3` on Red Hat Enterprise Linux 9.2 channels, updating the package to `2.52.5-1.el9_2` and addressing a broad set of WebKitGTK vulnerabilities. The patched issues include **CVE-2026-43701**, an Important-severity sandbox escape that could let a malicious website process restricted content outside the sandbox, along with multiple moderate-severity memory-handling flaws such as **CVE-2026-43699**, **CVE-2026-43716**, and **CVE-2026-39872** that can be triggered by crafted web content and lead to unexpected process crashes. Red Hat said fixes were issued across supported RHEL 7, 8, and 9 product streams through related errata, while older RHEL 6 `pywebkitgtk` and `webkitgtk` packages remain out of support scope and should be assumed affected. The advisory also bundles **CVE-2024-4367**, a Mozilla **PDF.js** flaw caused by a missing type check when handling fonts that can enable arbitrary JavaScript execution in the PDF.js context. Red Hat previously rated that issue Important for affected packages including `firefox`, `thunderbird`, `webkitgtk4`, and `webkit2gtk3`, and linked remediation to multiple RHSA updates across standard, EUS, AUS, and SAP-focused RHEL channels. The WebKitGTK fixes were tied to upstream security work that improved memory handling and addressed improper access control, reducing risks ranging from browser process crashes and denial of service to potential memory corruption, information disclosure, and sandbox bypass.
Aug 26, 2026
Mozilla released security updates for **Firefox 154**, supported **Firefox ESR** branches, and **Thunderbird** to fix a broad set of vulnerabilities affecting desktop and mobile users. Government and vendor advisories said the updates address **3 critical** and **17 high-severity** flaws involving arbitrary code execution, privilege escalation, security restriction bypass, sandbox escape, site isolation failures, use-after-free conditions, and information disclosure. Firefox 154 also introduced product changes including expanded Local Access Network protections for WebSocket connections, while security notices from Canada and Italy urged organizations to review Mozilla bulletins and update affected installations. Tenable and downstream Linux advisories flagged the issue set as **critical** across Windows, macOS, and Slackware packages, with affected versions including Firefox releases prior to 154, multiple ESR builds before their patched versions, and Thunderbird releases prior to **140.14** or **154.0** depending on branch. Nessus coverage tied the fixes to numerous CVEs, including **`CVE-2026-74990`** as a scoring reference in several advisories, and highlighted specific Thunderbird issues such as a Remote Settings Client sandbox escape, a CanvasWebGL site isolation flaw, a DOM: Networking privilege escalation bug, and WebAssembly and garbage-collection use-after-free vulnerabilities. The recommended action across all notices was to upgrade Mozilla products to the latest patched versions immediately.
Aug 26, 2026