9.8

CVE-2026-5734

Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2

Memory safety bugs present in Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. 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. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Mozilla ≫ Firefox SwEditionesr Version < 140.9.1
Mozilla ≫ Firefox SwEdition- Version < 149.0.2
Mozilla ≫ Thunderbird SwEditionesr Version < 140.9.1
Mozilla ≫ Thunderbird SwEdition- Version < 149.0.2
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.33% 0.247
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 9.8 3.9 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
134c704f-9b21-4f2e-91b3-4a467353bcc0 8.1 2.2 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 8.8 2.8 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

CWE-787 Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

https://www.mozilla.org/security/advisories/mfsa2026-25/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-27/
Vendor Advisory
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2022369%2C2023026%2C2023545%2C2023555%2C2023958%2C2025422%2C2025468%2C2025492%2C2025505
Broken Link
Issue Tracking
https://www.mozilla.org/security/advisories/mfsa2026-28/
https://www.mozilla.org/security/advisories/mfsa2026-29/
https://access.redhat.com/errata/RHSA-2026:11805
https://access.redhat.com/errata/RHSA-2026:11813
https://access.redhat.com/errata/RHSA-2026:12264
https://access.redhat.com/errata/RHSA-2026:13342
https://access.redhat.com/errata/RHSA-2026:13412
https://access.redhat.com/errata/RHSA-2026:13533
https://access.redhat.com/errata/RHSA-2026:13582
https://access.redhat.com/errata/RHSA-2026:13583
https://access.redhat.com/errata/RHSA-2026:13596
https://access.redhat.com/errata/RHSA-2026:13600
https://access.redhat.com/errata/RHSA-2026:13665
https://access.redhat.com/errata/RHSA-2026:13682
https://access.redhat.com/errata/RHSA-2026:13683
https://access.redhat.com/errata/RHSA-2026:13922
https://access.redhat.com/errata/RHSA-2026:13977
https://access.redhat.com/errata/RHSA-2026:14223
https://access.redhat.com/errata/RHSA-2026:14303
https://access.redhat.com/errata/RHSA-2026:15889
https://access.redhat.com/errata/RHSA-2026:7671
https://access.redhat.com/errata/RHSA-2026:7672
https://access.redhat.com/errata/RHSA-2026:8052
https://access.redhat.com/errata/RHSA-2026:8459
https://access.redhat.com/errata/RHSA-2026:9345
https://access.redhat.com/errata/RHSA-2026:9638
https://access.redhat.com/security/cve/CVE-2026-5734
https://bugzilla.redhat.com/show_bug.cgi?id=2455897
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5734.json