RHEL 9 : firefox (RHSA-2026:58897)
| Reporter | Title | Published | Views | Family All 657 |
|---|---|---|---|---|
| Exploit for Improper Isolation or Compartmentalization in Mozilla Firefox | 25 Aug 202612:53 | – | githubexploit | |
| Exploit for Improper Isolation or Compartmentalization in Mozilla Firefox | 25 Aug 202600:27 | – | githubexploit | |
| Exploit for Improper Privilege Management in Mozilla Firefox | 24 Aug 202620:07 | – | githubexploit | |
| CVE-2026-74934 | 18 Aug 202612:23 | – | alpinelinux | |
| CVE-2026-74935 | 18 Aug 202612:23 | – | alpinelinux | |
| CVE-2026-74936 | 18 Aug 202612:23 | – | alpinelinux | |
| CVE-2026-74939 | 18 Aug 202612:23 | – | alpinelinux | |
| CVE-2026-74940 | 18 Aug 202612:23 | – | alpinelinux | |
| CVE-2026-74941 | 18 Aug 202612:23 | – | alpinelinux | |
| CVE-2026-74942 | 18 Aug 202612:23 | – | alpinelinux |
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| Source | Link |
|---|---|
| bugzilla | www.bugzilla.redhat.com/show_bug.cgi |
| bugzilla | www.bugzilla.redhat.com/show_bug.cgi |
| bugzilla | www.bugzilla.redhat.com/show_bug.cgi |
| bugzilla | www.bugzilla.redhat.com/show_bug.cgi |
| bugzilla | www.bugzilla.redhat.com/show_bug.cgi |
| bugzilla | www.bugzilla.redhat.com/show_bug.cgi |
| bugzilla | www.bugzilla.redhat.com/show_bug.cgi |
| bugzilla | www.bugzilla.redhat.com/show_bug.cgi |
| bugzilla | www.bugzilla.redhat.com/show_bug.cgi |
| bugzilla | www.bugzilla.redhat.com/show_bug.cgi |
10
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Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and
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Security Fix(es):
* firefox: thunderbird: Mitigation bypass in the Data Loss Prevention component (CVE-2026-74983)
* firefox: thunderbird: Site isolation issue in the Graphics: CanvasWebGL component (CVE-2026-74934)
* firefox: thunderbird: Privilege escalation in the Networking: Cookies component (CVE-2026-74953)
* firefox: thunderbird: Internally found bugs fixed in Firefox ESR 140.14, Firefox ESR 153.1 and Firefox
154 (CVE-2026-74987)
* firefox: thunderbird: Information disclosure in the Graphics component (CVE-2026-74948)
* firefox: thunderbird: Use-after-free in the Graphics: ImageLib component (CVE-2026-74943)
* firefox: thunderbird: Information disclosure in the DOM: UI Events & Focus Handling component
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* firefox: thunderbird: Privilege escalation in the Graphics: CanvasWebGL component (CVE-2026-74941)
* firefox: Privilege escalation in the Shell Integration component (CVE-2026-74965)
* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
CanvasWebGL component (CVE-2026-74946)
* firefox: Race condition, use-after-free in the Graphics component (CVE-2026-74973)
* firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component
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* firefox: thunderbird: Internally found bugs fixed in Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR
153.1 and Firefox 154 (CVE-2026-74990)
* firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-74936)
* firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-74940)
* firefox: thunderbird: Site isolation issue in the WebExtensions component (CVE-2026-74960)
* firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-74969)
* firefox: thunderbird: Mitigation bypass in the Storage: Cache API component (CVE-2026-74959)
* firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-74976)
* firefox: thunderbird: Same-origin policy bypass in the Graphics: ImageLib component (CVE-2026-74974)
* firefox: thunderbird: Mitigation bypass in the Safe Browsing component (CVE-2026-74957)
* firefox: thunderbird: Same-origin policy bypass in the Audio/Video: Playback component (CVE-2026-74967)
* firefox: Privilege escalation in the Remote Settings Client component (CVE-2026-74942)
* firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-74939)
* firefox: thunderbird: Information disclosure in the DOM: Push Subscriptions component (CVE-2026-74972)
* firefox: thunderbird: Information disclosure in the Graphics: Text component (CVE-2026-74945)
* firefox: thunderbird: Same-origin policy bypass in the Networking: Cookies component (CVE-2026-74963)
* firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-74944)
* firefox: Integer overflow in the Graphics component (CVE-2026-74964)
* firefox: Site isolation issue in the Networking: Cookies component (CVE-2026-74962)
* firefox: thunderbird: Privilege escalation in the DOM: Networking component (CVE-2026-74935)
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.
Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.
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'content/dist/rhel9/9/x86_64/appstream/os',
'content/dist/rhel9/9/x86_64/appstream/source/SRPMS',
'content/public/ubi/dist/ubi9/9/aarch64/appstream/debug',
'content/public/ubi/dist/ubi9/9/aarch64/appstream/os',
'content/public/ubi/dist/ubi9/9/aarch64/appstream/source/SRPMS',
'content/public/ubi/dist/ubi9/9/ppc64le/appstream/debug',
'content/public/ubi/dist/ubi9/9/ppc64le/appstream/os',
'content/public/ubi/dist/ubi9/9/ppc64le/appstream/source/SRPMS',
'content/public/ubi/dist/ubi9/9/s390x/appstream/debug',
'content/public/ubi/dist/ubi9/9/s390x/appstream/os',
'content/public/ubi/dist/ubi9/9/s390x/appstream/source/SRPMS',
'content/public/ubi/dist/ubi9/9/x86_64/appstream/debug',
'content/public/ubi/dist/ubi9/9/x86_64/appstream/os',
'content/public/ubi/dist/ubi9/9/x86_64/appstream/source/SRPMS'
],
'pkgs': [
{'reference':'firefox-140.14.0-1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE},
{'reference':'firefox-x11-140.14.0-1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE}
]
},
{
'release': '9',
'sp': '8',
'repo_relative_urls': [
'content/e4s/rhel9/9.8/aarch64/appstream/debug',
'content/e4s/rhel9/9.8/aarch64/appstream/os',
'content/e4s/rhel9/9.8/aarch64/appstream/source/SRPMS',
'content/e4s/rhel9/9.8/ppc64le/appstream/debug',
'content/e4s/rhel9/9.8/ppc64le/appstream/os',
'content/e4s/rhel9/9.8/ppc64le/appstream/source/SRPMS',
'content/e4s/rhel9/9.8/s390x/appstream/debug',
'content/e4s/rhel9/9.8/s390x/appstream/os',
'content/e4s/rhel9/9.8/s390x/appstream/source/SRPMS',
'content/e4s/rhel9/9.8/x86_64/appstream/debug',
'content/e4s/rhel9/9.8/x86_64/appstream/os',
'content/e4s/rhel9/9.8/x86_64/appstream/source/SRPMS',
'content/e6s/rhel9/9.8/aarch64/appstream/debug',
'content/e6s/rhel9/9.8/aarch64/appstream/os',
'content/e6s/rhel9/9.8/aarch64/appstream/source/SRPMS',
'content/e6s/rhel9/9.8/ppc64le/appstream/debug',
'content/e6s/rhel9/9.8/ppc64le/appstream/os',
'content/e6s/rhel9/9.8/ppc64le/appstream/source/SRPMS',
'content/e6s/rhel9/9.8/s390x/appstream/debug',
'content/e6s/rhel9/9.8/s390x/appstream/os',
'content/e6s/rhel9/9.8/s390x/appstream/source/SRPMS',
'content/e6s/rhel9/9.8/x86_64/appstream/debug',
'content/e6s/rhel9/9.8/x86_64/appstream/os',
'content/e6s/rhel9/9.8/x86_64/appstream/source/SRPMS',
'content/eus/rhel9/9.8/aarch64/appstream/debug',
'content/eus/rhel9/9.8/aarch64/appstream/os',
'content/eus/rhel9/9.8/aarch64/appstream/source/SRPMS',
'content/eus/rhel9/9.8/ppc64le/appstream/debug',
'content/eus/rhel9/9.8/ppc64le/appstream/os',
'content/eus/rhel9/9.8/ppc64le/appstream/source/SRPMS',
'content/eus/rhel9/9.8/s390x/appstream/debug',
'content/eus/rhel9/9.8/s390x/appstream/os',
'content/eus/rhel9/9.8/s390x/appstream/source/SRPMS',
'content/eus/rhel9/9.8/x86_64/appstream/debug',
'content/eus/rhel9/9.8/x86_64/appstream/os',
'content/eus/rhel9/9.8/x86_64/appstream/source/SRPMS'
],
'pkgs': [
{'reference':'firefox-140.14.0-1.el9_8', 'sp':'8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE},
{'reference':'firefox-x11-140.14.0-1.el9_8', 'sp':'8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE}
]
}
];
var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);
var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');
var flag = 0;
var repo_relative_urls;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
# Check that the target release is equal to the affected release
if (!empty_or_null(constraint['release'])){
if (constraint['release'] != os_release) continue;
}
if (!empty_or_null(constraint['sp'])){
if (constraint['sp'] != os_sp) continue;
}
if (!empty_or_null(constraint['repo_relative_urls'])) repo_relative_urls = constraint['repo_relative_urls'];
foreach var pkg ( constraint['pkgs'] ) {
reference = NULL;
sp = NULL;
_cpu = NULL;
el_string = NULL;
rpm_spec_vers_cmp = NULL;
epoch = NULL;
allowmaj = NULL;
exists_check = NULL;
cves = NULL;
if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
if (reference &&
rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
(applicable_repo_urls || (!exists_check || rpm_exists(rpm:exists_check))) &&
rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
}
}
if (flag)
{
var extra = NULL;
if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
else extra = rpm_report_get();
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : extra
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'firefox / firefox-x11');
}
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24 Aug 2026 00:00Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.19.8
EPSS0.0057
SSVC