9.8

CVE-2026-5731

Memory safety bugs fixed in Firefox ESR 115.34.1, 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 115.34.0, 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 115.34.1, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Mozilla ≫ Firefox Version115.34.0 SwEditionesr
Mozilla ≫ Firefox Version140.9.0 SwEditionesr
Mozilla ≫ Firefox Version149.0.1 SwEdition-
Mozilla ≫ Thunderbird Version140.9.0 SwEditionesr
Mozilla ≫ Thunderbird Version149.0.1 SwEdition-
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.34% 0.258
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
134c704f-9b21-4f2e-91b3-4a467353bcc0 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
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-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

CWE-787 Out-of-bounds Write

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

https://bugzilla.mozilla.org/buglist.cgi?bug_id=2021894%2C2022225%2C2022252%2C2022294%2C2023007%2C2023130%2C2023191%2C2023364%2C2023829%2C2024074%2C2024417%2C2024433%2C2024436%2C2024437%2C2024453%2C2024461%2C2024462%2C2024472%2C2024474%2C2024477%2C2025364%2C2025401%2C2025402%2C2025472%2C2026287%2C2026299%2C2026305%2C2026426
Broken Link
https://www.mozilla.org/security/advisories/mfsa2026-25/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-26/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-27/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-28/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-29/
Vendor Advisory
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-2026-5731
https://bugzilla.redhat.com/show_bug.cgi?id=2455901
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5731.json