RHSA-2026:2073

Vulnerability from csaf_redhat - Published: 2026-02-05 10:50 - Updated: 2026-10-16 10:58
Summary
Red Hat Security Advisory: firefox security update
Severity
Important
Notes
Topic: An update for firefox is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On. 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.
Details: Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. Security Fix(es): * firefox: Spoofing issue in the Downloads Panel component (CVE-2025-14327) * firefox: Use-after-free in the JavaScript: GC component (CVE-2026-0885) * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147 (CVE-2026-0891) * firefox: Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-0878) * firefox: Use-after-free in the IPC component (CVE-2026-0882) * firefox: Use-after-free in the JavaScript Engine component (CVE-2026-0884) * firefox: Information disclosure in the Networking component (CVE-2026-0883) * firefox: Mitigation bypass in the DOM: Security component (CVE-2026-0877) * firefox: Spoofing issue in the DOM: Copy & Paste and Drag & Drop component (CVE-2026-0890) * firefox: Clickjacking issue, information disclosure in the PDF Viewer component (CVE-2026-0887) * firefox: Sandbox escape due to incorrect boundary conditions in the Graphics component (CVE-2026-0879) * firefox: Sandbox escape due to integer overflow in the Graphics component (CVE-2026-0880) * firefox: Incorrect boundary conditions in the Graphics component (CVE-2026-0886) 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.
Terms of Use: 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-2025-14327

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Spoofing issue in the Downloads Panel component

7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
CWE-290 - Authentication Bypass by Spoofing
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-8.4.0.Z.AUS:firefox-0:140.7.0-1.el8_4.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.4.0.Z.AUS:firefox-0:140.7.0-1.el8_4.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.4.0.Z.AUS:firefox-debuginfo-0:140.7.0-1.el8_4.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.4.0.Z.AUS:firefox-debugsource-0:140.7.0-1.el8_4.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:firefox-0:140.7.0-1.el8_4.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:firefox-0:140.7.0-1.el8_4.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:firefox-debuginfo-0:140.7.0-1.el8_4.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:firefox-debugsource-0:140.7.0-1.el8_4.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Moderate
CVE-2026-0877

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Mitigation bypass in the DOM: Security component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-693 - Protection Mechanism Failure
Affected products
Fixed 8 products, the same list as for CVE-2025-14327
Threats
Impact Important
CVE-2026-0878

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected products
Fixed 8 products, the same list as for CVE-2025-14327
Threats
Impact Important
CVE-2026-0879

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to incorrect boundary conditions in the Graphics component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected products
Fixed 8 products, the same list as for CVE-2025-14327
Threats
Impact Important
CVE-2026-0880

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to integer overflow in the Graphics component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-190 - Integer Overflow or Wraparound
Affected products
Fixed 8 products, the same list as for CVE-2025-14327
Threats
Impact Important
CVE-2026-0882

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the IPC component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 8 products, the same list as for CVE-2025-14327
Threats
Impact Important
CVE-2026-0883

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Information disclosure in the Networking component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Affected products
Fixed 8 products, the same list as for CVE-2025-14327
Threats
Impact Moderate
CVE-2026-0884

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the JavaScript Engine component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-416 - Use After Free
Affected products
Fixed 8 products, the same list as for CVE-2025-14327
Threats
Impact Moderate
CVE-2026-0885

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the JavaScript: GC component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-416 - Use After Free
Affected products
Fixed 8 products, the same list as for CVE-2025-14327
Threats
Impact Moderate
CVE-2026-0886

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Incorrect boundary conditions in the Graphics component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected products
Fixed 8 products, the same list as for CVE-2025-14327
Threats
Impact Moderate
CVE-2026-0887

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Clickjacking issue, information disclosure in the PDF Viewer component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-497 - Exposure of Sensitive System Information to an Unauthorized Control Sphere
Affected products
Fixed 8 products, the same list as for CVE-2025-14327
Threats
Impact Moderate
CVE-2026-0890

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Spoofing issue in the DOM: Copy & Paste and Drag & Drop component

3.4 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
CWE-290 - Authentication Bypass by Spoofing
Affected products
Fixed 8 products, the same list as for CVE-2025-14327
Threats
Impact Low
CVE-2026-0891

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected products
Fixed 8 products, the same list as for CVE-2025-14327
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:2073 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2420507 external
https://bugzilla.redhat.com/show_bug.cgi?id=2428961 external
https://bugzilla.redhat.com/show_bug.cgi?id=2428963 external
https://bugzilla.redhat.com/show_bug.cgi?id=2428965 external
https://bugzilla.redhat.com/show_bug.cgi?id=2428966 external
https://bugzilla.redhat.com/show_bug.cgi?id=2428967 external
https://bugzilla.redhat.com/show_bug.cgi?id=2428968 external
https://bugzilla.redhat.com/show_bug.cgi?id=2428969 external
https://bugzilla.redhat.com/show_bug.cgi?id=2428971 external
https://bugzilla.redhat.com/show_bug.cgi?id=2428972 external
https://bugzilla.redhat.com/show_bug.cgi?id=2428973 external
https://bugzilla.redhat.com/show_bug.cgi?id=2428975 external
https://bugzilla.redhat.com/show_bug.cgi?id=2428978 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2025-14327 self
https://bugzilla.redhat.com/show_bug.cgi?id=2420507 external
https://www.cve.org/CVERecord?id=CVE-2025-14327 external
https://nvd.nist.gov/vuln/detail/CVE-2025-14327 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-0877 self
https://bugzilla.redhat.com/show_bug.cgi?id=2428969 external
https://www.cve.org/CVERecord?id=CVE-2026-0877 external
https://nvd.nist.gov/vuln/detail/CVE-2026-0877 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-0878 self
https://bugzilla.redhat.com/show_bug.cgi?id=2428965 external
https://www.cve.org/CVERecord?id=CVE-2026-0878 external
https://nvd.nist.gov/vuln/detail/CVE-2026-0878 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-0879 self
https://bugzilla.redhat.com/show_bug.cgi?id=2428973 external
https://www.cve.org/CVERecord?id=CVE-2026-0879 external
https://nvd.nist.gov/vuln/detail/CVE-2026-0879 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-0880 self
https://bugzilla.redhat.com/show_bug.cgi?id=2428975 external
https://www.cve.org/CVERecord?id=CVE-2026-0880 external
https://nvd.nist.gov/vuln/detail/CVE-2026-0880 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-0882 self
https://bugzilla.redhat.com/show_bug.cgi?id=2428966 external
https://www.cve.org/CVERecord?id=CVE-2026-0882 external
https://nvd.nist.gov/vuln/detail/CVE-2026-0882 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-0883 self
https://bugzilla.redhat.com/show_bug.cgi?id=2428968 external
https://www.cve.org/CVERecord?id=CVE-2026-0883 external
https://nvd.nist.gov/vuln/detail/CVE-2026-0883 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-0884 self
https://bugzilla.redhat.com/show_bug.cgi?id=2428967 external
https://www.cve.org/CVERecord?id=CVE-2026-0884 external
https://nvd.nist.gov/vuln/detail/CVE-2026-0884 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-0885 self
https://bugzilla.redhat.com/show_bug.cgi?id=2428961 external
https://www.cve.org/CVERecord?id=CVE-2026-0885 external
https://nvd.nist.gov/vuln/detail/CVE-2026-0885 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-0886 self
https://bugzilla.redhat.com/show_bug.cgi?id=2428978 external
https://www.cve.org/CVERecord?id=CVE-2026-0886 external
https://nvd.nist.gov/vuln/detail/CVE-2026-0886 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-0887 self
https://bugzilla.redhat.com/show_bug.cgi?id=2428972 external
https://www.cve.org/CVERecord?id=CVE-2026-0887 external
https://nvd.nist.gov/vuln/detail/CVE-2026-0887 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-0890 self
https://bugzilla.redhat.com/show_bug.cgi?id=2428971 external
https://www.cve.org/CVERecord?id=CVE-2026-0890 external
https://nvd.nist.gov/vuln/detail/CVE-2026-0890 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-0891 self
https://bugzilla.redhat.com/show_bug.cgi?id=2428963 external
https://www.cve.org/CVERecord?id=CVE-2026-0891 external
https://nvd.nist.gov/vuln/detail/CVE-2026-0891 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
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            "baseScore": 6.1,
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            "integrityImpact": "LOW",
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      "title": "firefox: thunderbird: Clickjacking issue, information disclosure in the PDF Viewer component"
    },
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      "cve": "CVE-2026-0890",
      "cwe": {
        "id": "CWE-290",
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        },
        {
          "category": "summary",
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          "title": "Vulnerability summary"
        },
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          "text": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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      "references": [
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        {
          "category": "external",
          "summary": "RHBZ#2428971",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2428971"
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-0890",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-0890"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-0890",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-0890"
        },
        {
          "category": "external",
          "summary": "https://www.mozilla.org/security/advisories/mfsa2026-03/#CVE-2026-0890",
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-03/#CVE-2026-0890"
        },
        {
          "category": "external",
          "summary": "https://www.mozilla.org/security/advisories/mfsa2026-05/#CVE-2026-0890",
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-05/#CVE-2026-0890"
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      "release_date": "2026-01-13T13:30:59.089000+00:00",
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        {
          "category": "vendor_fix",
          "date": "2026-02-05T10:50:14+00:00",
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          "url": "https://access.redhat.com/errata/RHSA-2026:2073"
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        {
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      "scores": [
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            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
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            "baseScore": 3.4,
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          "details": "Low"
        }
      ],
      "title": "firefox: thunderbird: Spoofing issue in the DOM: Copy \u0026 Paste and Drag \u0026 Drop component"
    },
    {
      "cve": "CVE-2026-0891",
      "cwe": {
        "id": "CWE-119",
        "name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
      },
      "discovery_date": "2026-01-13T14:01:25.941404+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2428963"
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          "text": "A flaw was found in Firefox and Thunderbird. The Mozilla Foundation\u0027s Security Advisory describes the following issue:\nMemory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.",
          "title": "Vulnerability description"
        },
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          "category": "summary",
          "text": "firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.",
          "title": "Statement"
        },
        {
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          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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        },
        {
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          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-0891",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-0891"
        },
        {
          "category": "external",
          "summary": "https://www.mozilla.org/security/advisories/mfsa2026-03/#CVE-2026-0891",
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-03/#CVE-2026-0891"
        },
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          "summary": "https://www.mozilla.org/security/advisories/mfsa2026-05/#CVE-2026-0891",
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-05/#CVE-2026-0891"
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          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147"
    }
  ]
}



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