Red Hat Security Advisory: firefox security update
Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. Security Fix(es): * libaom: libaom: heap buffer overflow in AV1 encoder first-pass stats buffer via LAP mode (CVE-2026-56208) * firefox: thunderbird: Site isolation issue in the DOM: Navigation component (CVE-2026-15719) * firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-15718) * firefox: thunderbird: Mitigation bypass in the Enterprise Policies component (CVE-2026-16390) * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: cubeb component (CVE-2026-16350) * firefox: thunderbird: Information disclosure in the Storage: IndexedDB component (CVE-2026-16391) * firefox: thunderbird: Site isolation issue in the Networking: HTTP component (CVE-2026-16375) * firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16356) * firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-16363) * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.13 and Firefox 153 (CVE-2026-16412) * firefox: thunderbird: Same-origin policy bypass in the Networking: DNS component (CVE-2026-16381) * firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-16355) * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38 and Firefox ESR 140.13 (CVE-2026-16361) * firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16352) * firefox: thunderbird: Incorrect boundary conditions in the JavaScript: WebAssembly component (CVE-2026-16368) * firefox: thunderbird: Mitigation bypass in the PDF Viewer component (CVE-2026-16377) * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38, Firefox ESR 140.13 and Firefox 153 (CVE-2026-16360) * firefox: thunderbird: Use-after-free in the WebRTC: Audio/Video component (CVE-2026-16362) * firefox: thunderbird: Site isolation issue in the Graphics: WebRender component (CVE-2026-16358) * firefox: thunderbird: Site isolation issue in the Networking component (CVE-2026-16387) * firefox: thunderbird: Same-origin policy bypass in the DOM: Navigation component (CVE-2026-16349) * firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-16357) * firefox: thunderbird: Sandbox escape due to use-after-free in the DOM: Navigation component (CVE-2026-16351) * firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-16371) * firefox: thunderbird: Privilege escalation in the DOM: Content Processes component (CVE-2026-16379) * firefox: thunderbird: Information disclosure in the Graphics: ImageLib component (CVE-2026-16354) * firefox: thunderbird: Information disclosure in the Framework component in DevTools (CVE-2026-16374) * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-16359) * firefox: thunderbird: Mitigation bypass in the DOM: Networking component (CVE-2026-16383) * firefox: thunderbird: Integer overflow in the JavaScript: WebAssembly component (CVE-2026-16369) * firefox: thunderbird: Invalid pointer in the DOM: Bindings (WebIDL) component (CVE-2026-16353) * firefox: thunderbird: Privilege escalation in WebExtensions (CVE-2026-16396) * firefox: thunderbird: Information disclosure in the Networking: WebSockets component (CVE-2026-16405) 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.
AI Analysis
Technical Summary
Red Hat has issued security advisories RHSA-2026:47104 and RHSA-2026:47105 addressing multiple vulnerabilities in Mozilla Firefox and Thunderbird packages distributed with Red Hat Enterprise Linux 8 and 9. The vulnerabilities include CVE-2026-15718 among others, covering issues such as heap buffer overflow in libaom AV1 encoder, site isolation flaws in DOM and networking components, invalid pointer dereferences in JavaScript WebAssembly, mitigation bypasses in enterprise policies and PDF viewer, incorrect boundary conditions in audio/video components, information disclosure in IndexedDB and graphics components, sandbox escapes due to use-after-free bugs in disability access APIs and DOM navigation, JIT miscompilations, same-origin policy bypasses, privilege escalations, and integer overflows. These issues affect multiple components of Firefox and Thunderbird, potentially impacting memory safety, sandbox integrity, and information confidentiality. Red Hat has released updated packages for affected versions of RHEL 8 and 9 to fix these vulnerabilities.
Potential Impact
The vulnerabilities collectively impact the security of Firefox and Thunderbird by enabling potential memory corruption (heap buffer overflow, use-after-free, invalid pointers), bypass of security mitigations, sandbox escapes, privilege escalation, information disclosure, and bypass of same-origin policies. These issues could allow an attacker to execute arbitrary code, escalate privileges, or access sensitive information within the context of the affected applications. The severity is rated as high by Red Hat Product Security.
Mitigation Recommendations
Red Hat has released updated Firefox and Thunderbird packages for Red Hat Enterprise Linux 8 and 9 that address these vulnerabilities. Users should apply the security updates as described in Red Hat advisories RHSA-2026:47104 and RHSA-2026:47105. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigation actions are indicated beyond applying these official patches.
Red Hat Security Advisory: firefox security update
Description
Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. Security Fix(es): * libaom: libaom: heap buffer overflow in AV1 encoder first-pass stats buffer via LAP mode (CVE-2026-56208) * firefox: thunderbird: Site isolation issue in the DOM: Navigation component (CVE-2026-15719) * firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-15718) * firefox: thunderbird: Mitigation bypass in the Enterprise Policies component (CVE-2026-16390) * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: cubeb component (CVE-2026-16350) * firefox: thunderbird: Information disclosure in the Storage: IndexedDB component (CVE-2026-16391) * firefox: thunderbird: Site isolation issue in the Networking: HTTP component (CVE-2026-16375) * firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16356) * firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-16363) * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.13 and Firefox 153 (CVE-2026-16412) * firefox: thunderbird: Same-origin policy bypass in the Networking: DNS component (CVE-2026-16381) * firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-16355) * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38 and Firefox ESR 140.13 (CVE-2026-16361) * firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16352) * firefox: thunderbird: Incorrect boundary conditions in the JavaScript: WebAssembly component (CVE-2026-16368) * firefox: thunderbird: Mitigation bypass in the PDF Viewer component (CVE-2026-16377) * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38, Firefox ESR 140.13 and Firefox 153 (CVE-2026-16360) * firefox: thunderbird: Use-after-free in the WebRTC: Audio/Video component (CVE-2026-16362) * firefox: thunderbird: Site isolation issue in the Graphics: WebRender component (CVE-2026-16358) * firefox: thunderbird: Site isolation issue in the Networking component (CVE-2026-16387) * firefox: thunderbird: Same-origin policy bypass in the DOM: Navigation component (CVE-2026-16349) * firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-16357) * firefox: thunderbird: Sandbox escape due to use-after-free in the DOM: Navigation component (CVE-2026-16351) * firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-16371) * firefox: thunderbird: Privilege escalation in the DOM: Content Processes component (CVE-2026-16379) * firefox: thunderbird: Information disclosure in the Graphics: ImageLib component (CVE-2026-16354) * firefox: thunderbird: Information disclosure in the Framework component in DevTools (CVE-2026-16374) * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-16359) * firefox: thunderbird: Mitigation bypass in the DOM: Networking component (CVE-2026-16383) * firefox: thunderbird: Integer overflow in the JavaScript: WebAssembly component (CVE-2026-16369) * firefox: thunderbird: Invalid pointer in the DOM: Bindings (WebIDL) component (CVE-2026-16353) * firefox: thunderbird: Privilege escalation in WebExtensions (CVE-2026-16396) * firefox: thunderbird: Information disclosure in the Networking: WebSockets component (CVE-2026-16405) 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.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Red Hat has issued security advisories RHSA-2026:47104 and RHSA-2026:47105 addressing multiple vulnerabilities in Mozilla Firefox and Thunderbird packages distributed with Red Hat Enterprise Linux 8 and 9. The vulnerabilities include CVE-2026-15718 among others, covering issues such as heap buffer overflow in libaom AV1 encoder, site isolation flaws in DOM and networking components, invalid pointer dereferences in JavaScript WebAssembly, mitigation bypasses in enterprise policies and PDF viewer, incorrect boundary conditions in audio/video components, information disclosure in IndexedDB and graphics components, sandbox escapes due to use-after-free bugs in disability access APIs and DOM navigation, JIT miscompilations, same-origin policy bypasses, privilege escalations, and integer overflows. These issues affect multiple components of Firefox and Thunderbird, potentially impacting memory safety, sandbox integrity, and information confidentiality. Red Hat has released updated packages for affected versions of RHEL 8 and 9 to fix these vulnerabilities.
Potential Impact
The vulnerabilities collectively impact the security of Firefox and Thunderbird by enabling potential memory corruption (heap buffer overflow, use-after-free, invalid pointers), bypass of security mitigations, sandbox escapes, privilege escalation, information disclosure, and bypass of same-origin policies. These issues could allow an attacker to execute arbitrary code, escalate privileges, or access sensitive information within the context of the affected applications. The severity is rated as high by Red Hat Product Security.
Mitigation Recommendations
Red Hat has released updated Firefox and Thunderbird packages for Red Hat Enterprise Linux 8 and 9 that address these vulnerabilities. Users should apply the security updates as described in Red Hat advisories RHSA-2026:47104 and RHSA-2026:47105. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigation actions are indicated beyond applying these official patches.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:47105
- Cve Count
- 33
- Additional Cves
- ["CVE-2026-15719","CVE-2026-16349","CVE-2026-16350","CVE-2026-16351","CVE-2026-16352","CVE-2026-16353","CVE-2026-16354","CVE-2026-16355","CVE-2026-16356","CVE-2026-16357","CVE-2026-16358","CVE-2026-16359","CVE-2026-16360","CVE-2026-16361","CVE-2026-16362","CVE-2026-16363","CVE-2026-16368","CVE-2026-16369","CVE-2026-16371","CVE-2026-16374","CVE-2026-16375","CVE-2026-16377","CVE-2026-16379","CVE-2026-16381","CVE-2026-16383","CVE-2026-16387","CVE-2026-16390","CVE-2026-16391","CVE-2026-16396","CVE-2026-16405","CVE-2026-16412","CVE-2026-56208"]
- State
- PUBLISHED
Threat ID: 6a6940089c2644c7f866593b
Added to database: 07/28/2026, 23:49:28 UTC
Last enriched: 08/06/2026, 22:49:29 UTC
Last updated: 09/12/2026, 22:01:31 UTC
Views: 71
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