rlsa-2026:21381
Vulnerability from osv_rocky
Published
2026-05-30 18:03
Modified
2026-06-13 18:05
Summary
Important: thunderbird security update
Details

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

  • firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component (CVE-2026-8388)

  • firefox: Other issue in the JavaScript Engine component (CVE-2026-8391)

  • firefox: Sandbox escape in the Profile Backup component (CVE-2026-8401)

  • firefox: Integer overflow in the Networking: JAR component (CVE-2026-8956)

  • firefox: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151 (CVE-2026-8975)

  • firefox: Privilege escalation in the DOM: Workers component (CVE-2026-8955)

  • firefox: Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component (CVE-2026-8968)

  • firefox: Incorrect boundary conditions, integer overflow in the Audio/Video component (CVE-2026-8954)

  • firefox: Information disclosure, sandbox escape in the Security: Process Sandboxing component (CVE-2026-8958)

  • firefox: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-8946)

  • firefox: Privilege escalation in the Security component (CVE-2026-8970)

  • firefox: Same-origin policy bypass in the Networking: HTTP component (CVE-2026-8950)

  • firefox: Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151 (CVE-2026-8974)

  • firefox: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-8953)

  • firefox: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component (CVE-2026-8959)

  • firefox: Spoofing issue in the Form Autofill component (CVE-2026-8961)

  • firefox: Use-after-free in the DOM: Bindings (WebIDL) component (CVE-2026-8947)

  • firefox: Mitigation bypass in the DOM: Security component (CVE-2026-8962)

  • firefox: Privilege escalation in the Enterprise Policies component (CVE-2026-8957)

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.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Credits
Rocky Enterprise Software Foundation
Red Hat
References
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:9",
        "name": "thunderbird",
        "purl": "pkg:rpm/rocky-linux/thunderbird?distro=rocky-linux-9\u0026epoch=0"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "AppStream"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0:140.11.0-1.el9_8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "details": "Mozilla Thunderbird is a standalone mail and newsgroup client.\n\nSecurity Fix(es):\n\n* firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component (CVE-2026-8388)\n\n* firefox: Other issue in the JavaScript Engine component (CVE-2026-8391)\n\n* firefox: Sandbox escape in the Profile Backup component (CVE-2026-8401)\n\n* firefox: Integer overflow in the Networking: JAR component (CVE-2026-8956)\n\n* firefox: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151 (CVE-2026-8975)\n\n* firefox: Privilege escalation in the DOM: Workers component (CVE-2026-8955)\n\n* firefox: Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component (CVE-2026-8968)\n\n* firefox: Incorrect boundary conditions, integer overflow in the Audio/Video component (CVE-2026-8954)\n\n* firefox: Information disclosure, sandbox escape in the Security: Process Sandboxing component (CVE-2026-8958)\n\n* firefox: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-8946)\n\n* firefox: Privilege escalation in the Security component (CVE-2026-8970)\n\n* firefox: Same-origin policy bypass in the Networking: HTTP component (CVE-2026-8950)\n\n* firefox: Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151 (CVE-2026-8974)\n\n* firefox: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-8953)\n\n* firefox: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component (CVE-2026-8959)\n\n* firefox: Spoofing issue in the Form Autofill component (CVE-2026-8961)\n\n* firefox: Use-after-free in the DOM: Bindings (WebIDL) component (CVE-2026-8947)\n\n* firefox: Mitigation bypass in the DOM: Security component (CVE-2026-8962)\n\n* firefox: Privilege escalation in the Enterprise Policies component (CVE-2026-8957)\n\nFor 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.",
  "id": "RLSA-2026:21381",
  "modified": "2026-06-13T18:05:48.900627Z",
  "published": "2026-05-30T18:03:01.190443Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:21381"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2476469"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2476475"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2476492"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479839"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479840"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479842"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479846"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479847"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479848"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479849"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479852"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479853"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479855"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479860"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479861"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479871"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479873"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479876"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479880"
    }
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Important: thunderbird security update",
  "upstream": [
    "CVE-2026-8388",
    "CVE-2026-8391",
    "CVE-2026-8401",
    "CVE-2026-8946",
    "CVE-2026-8947",
    "CVE-2026-8950",
    "CVE-2026-8953",
    "CVE-2026-8954",
    "CVE-2026-8955",
    "CVE-2026-8956",
    "CVE-2026-8957",
    "CVE-2026-8958",
    "CVE-2026-8959",
    "CVE-2026-8961",
    "CVE-2026-8962",
    "CVE-2026-8968",
    "CVE-2026-8970",
    "CVE-2026-8974",
    "CVE-2026-8975"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.