RHSA-2026:67129
Vulnerability from csaf_opensuse - Published: 2026-09-14 03:15 - Updated: 2026-10-01 23:40Summary
Red Hat Security Advisory: firefox security update
Severity
Important
Notes
Topic: An update for firefox is now available for Red Hat Enterprise Linux 10.
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: thunderbird: Privilege escalation in the DOM: Workers component (CVE-2026-16365)
* firefox: thunderbird: Sandbox escape in the Remote Settings Client component (CVE-2026-75874)
* firefox: Sandbox escape due to use-after-free in the DOM: Security component (CVE-2026-84121)
* firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2, Firefox ESR 140.15 and Firefox ESR 115.40 (CVE-2026-84145)
* firefox: Sandbox escape due to use-after-free in the DOM: Navigation component (CVE-2026-84119)
* firefox: Use-after-free in the Audio/Video component (CVE-2026-84120)
* firefox: Privilege escalation due to invalid pointer in the Graphics component (CVE-2026-84131)
* firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-84124)
* firefox: Use-after-free in the Audio/Video component (CVE-2026-84122)
* firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2 and Firefox ESR 140.15 (CVE-2026-84143)
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.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Privilege escalation in the DOM: Workers component
7.5 (High)
Affected products
Fixed
13 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:firefox-0:140.15.0-1.el10_2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:firefox-0:140.15.0-1.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:firefox-0:140.15.0-1.el10_2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:firefox-0:140.15.0-1.el10_2.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:firefox-0:140.15.0-1.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:firefox-debuginfo-0:140.15.0-1.el10_2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:firefox-debuginfo-0:140.15.0-1.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:firefox-debuginfo-0:140.15.0-1.el10_2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:firefox-debuginfo-0:140.15.0-1.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:firefox-debugsource-0:140.15.0-1.el10_2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:firefox-debugsource-0:140.15.0-1.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:firefox-debugsource-0:140.15.0-1.el10_2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:firefox-debugsource-0:140.15.0-1.el10_2.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape in the Remote Settings Client component
7.5 (High)
Affected products
Fixed
13 products, the same list as for
CVE-2026-16365
Threats
Impact
Important
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to use-after-free in the DOM: Navigation component
7.5 (High)
Affected products
Fixed
13 products, the same list as for
CVE-2026-16365
Threats
Impact
Important
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the Audio/Video component
7.5 (High)
Affected products
Fixed
13 products, the same list as for
CVE-2026-16365
Threats
Impact
Important
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to use-after-free in the DOM: Security component
7.5 (High)
Affected products
Fixed
13 products, the same list as for
CVE-2026-16365
Threats
Impact
Important
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the Audio/Video component
7.5 (High)
Affected products
Fixed
13 products, the same list as for
CVE-2026-16365
Threats
Impact
Important
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the DOM: Core & HTML component
7.5 (High)
Affected products
Fixed
13 products, the same list as for
CVE-2026-16365
Threats
Impact
Important
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Privilege escalation due to invalid pointer in the Graphics component
6.1 (Medium)
Affected products
Fixed
13 products, the same list as for
CVE-2026-16365
Threats
Impact
Moderate
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Internally found bugs present in Firefox 154, Firefox ESR 153.1 and Firefox ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited.
7.5 (High)
Affected products
Fixed
13 products, the same list as for
CVE-2026-16365
Threats
Impact
Important
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Internally found bugs present in Firefox 154, Firefox ESR 153.1, Firefox ESR 140.14 and Firefox ESR 115.39. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited.
7.5 (High)
Affected products
Fixed
13 products, the same list as for
CVE-2026-16365
Threats
Impact
Important
References
78 references
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"restart_required": {
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},
"url": "https://access.redhat.com/errata/RHSA-2026:67129"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"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",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2 and Firefox ESR 140.15"
},
{
"cve": "CVE-2026-84145",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2026-09-01T12:42:33.455531+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2526760"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Firefox. The Mozilla Foundation\u0027s Security Advisory describes the following issue:\nInternally found bugs present in Firefox 154, Firefox ESR 153.1, Firefox ESR 140.14 and Firefox ESR 115.39. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2, Firefox ESR 140.15 and Firefox ESR 115.40",
"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"
},
{
"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"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-84145"
},
{
"category": "external",
"summary": "RHBZ#2526760",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2526760"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-84145",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-84145"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-84145",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84145"
},
{
"category": "external",
"summary": "https://www.mozilla.org/security/advisories/mfsa2026-84/#CVE-2026-84145",
"url": "https://www.mozilla.org/security/advisories/mfsa2026-84/#CVE-2026-84145"
},
{
"category": "external",
"summary": "https://www.mozilla.org/security/advisories/mfsa2026-87/#CVE-2026-84145",
"url": "https://www.mozilla.org/security/advisories/mfsa2026-87/#CVE-2026-84145"
}
],
"release_date": "2026-09-01T12:18:43.808000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-14T03:15:13+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"attackVector": "NETWORK",
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"baseScore": 7.5,
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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",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2, Firefox ESR 140.15 and Firefox ESR 115.40"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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
| Author | Source | Type | Date | Other |
|---|
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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