CVE-2026-2771
Detail
Modified After Enrichment
This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
Current Description
Undefined behavior in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
View Analysis Description
Analysis
Description
Undefined behavior in the DOM: Core & HTML component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
Metrics
NVD enrichment efforts reference publicly available information to associate
vector strings. CVSS information contributed by other sources is also
displayed.
CVSS 4.0 Severity and Vector Strings:
NVD assessment
not yet provided.
CVSS 3.x Severity and Vector Strings:
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0 Severity and Vector Strings:
Base
Score:
NVD assessment
not yet provided.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving NIST webspace.
We have provided these links to other web sites because they
may have information that would be of interest to you. No
inferences should be drawn on account of other sites being
referenced, or not, from this page. There may be other web
sites that are more appropriate for your purpose. NIST does
not necessarily endorse the views expressed, or concur with
the facts presented on these sites. Further, NIST does not
endorse any commercial products that may be mentioned on
these sites. Please address comments about this page to [email protected].
Change History
8 change records found show changes
CVE Modified by redhat-SADP
6/29/2026 11:18:18 PM
| Action |
Type |
Old Value |
New Value |
| Added |
CVSS V3.1 |
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3338
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3339
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3361
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3491
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3492
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3493
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3494
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3495
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3496
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3497
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3515
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3516
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3517
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3976
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3978
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3979
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3980
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3981
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3982
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3983
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:3984
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:4022
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:4152
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:4260
|
| Added |
Reference |
https://access.redhat.com/errata/RHSA-2026:4432
|
| Added |
Reference |
https://access.redhat.com/security/cve/CVE-2026-2771
|
| Added |
Reference |
https://bugzilla.redhat.com/show_bug.cgi?id=2442288
|
| Added |
Reference |
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2771.json
|
| Added |
Affected |
Record truncated, showing 2048 of 3052 characters.
View Entire Change Record
[{"vendor":"Red Hat","product":"Red Hat Enterprise Linux Server (v. 7 ELS)","defaultStatus":"affected","cpes":["cpe:/o:redhat:rhel_els:7"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream EUS (v. 10.0)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream (v. 10)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10.1"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream (v. 8)","defaultStatus":"affected","cpes":["cpe:/a:redhat:enterprise_linux:8::appstream"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream AUS (v. 8.2)","defaultStatus":"affected","cpes":["cpe:/a:redhat:rhel_aus:8.2::appstream"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream AUS (v.8.4)","defaultStatus":"affected","cpes":["cpe:/a:redhat:rhel_aus:8.4::appstream"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)","defaultStatus":"affected","cpes":["cpe:/a:redhat:rhel_eus_long_life:8.4::appstream"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream AUS (v.8.6)","defaultStatus":"affected","cpes":["cpe:/a:redhat:rhel_aus:8.6::appstream"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream E4S (v.8.6)","defaultStatus":"affected","cpes":["cpe:/a:redhat:rhel_e4s:8.6::appstream"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream TUS (v.8.6)","defaultStatus":"affected","cpes":["cpe:/a:redhat:rhel_tus:8.6::appstream"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream E4S (v.8.8)","defaultStatus":"affected","cpes":["cpe:/a:redhat:rhel_e4s:8.8::appstream"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream TUS (v.8.8)","defaultStatus":"affected","cpes":["cpe:/a:redhat:rhel_tus:8.8::appstream"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream E4S (v.9.0)","defaultStatus":"affected","cpes":["cpe:/a:redhat:rhel_e4s:9.0::appstream"]},{"vendor":"Red H
|
CVE Modified by CISA-ADP
6/17/2026 6:31:42 AM
| Action |
Type |
Old Value |
New Value |
| Added |
SSVC |
{"timestamp":"2026-03-03T01:45:06.873601Z","id":"CVE-2026-2771","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}
|
| Added |
SSVC |
{"timestamp":"2026-04-16T14:30:32.883941Z","id":"CVE-2026-2771","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}
|
CVE Modified by Mozilla Corporation
6/17/2026 6:31:42 AM
| Action |
Type |
Old Value |
New Value |
| Added |
Affected |
[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"115.33","lessThanOrEqual":"115.*","versionType":"rpm","status":"unaffected"},{"version":"140.8","lessThanOrEqual":"140.*","versionType":"rpm","status":"unaffected"},{"version":"148","lessThanOrEqual":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"140.8","lessThanOrEqual":"140.*","versionType":"rpm","status":"unaffected"},{"version":"148","lessThanOrEqual":"*","versionType":"rpm","status":"unaffected"}]}]
|
CVE Modified by Mozilla Corporation
4/13/2026 11:17:23 AM
| Action |
Type |
Old Value |
New Value |
| Changed |
Description |
Undefined behavior in the DOM: Core & HTML component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
|
Undefined behavior in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
|
CVE Modified by CISA-ADP
3/11/2026 12:16:41 PM
| Action |
Type |
Old Value |
New Value |
| Added |
CVSS V3.1 |
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
|
| Added |
CWE |
CWE-125
|
Initial Analysis by NIST
2/25/2026 11:39:30 AM
| Action |
Type |
Old Value |
New Value |
| Added |
CVSS V3.1 |
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
|
| Added |
CWE |
NVD-CWE-noinfo
|
| Added |
CPE Configuration |
OR
*cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* versions up to (excluding) 148.0
*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* versions up to (excluding) 148.0
*cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* versions up to (excluding) 115.33.0
*cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* versions from (including) 128.0 up to (excluding) 140.8.0
*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* versions up to (excluding) 140.8.0
|
| Added |
Reference Type |
Mozilla Corporation: https://bugzilla.mozilla.org/show_bug.cgi?id=2014593 Types: Issue Tracking, Permissions Required
|
| Added |
Reference Type |
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-13/ Types: Vendor Advisory
|
| Added |
Reference Type |
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-14/ Types: Vendor Advisory
|
| Added |
Reference Type |
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-15/ Types: Vendor Advisory
|
| Added |
Reference Type |
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-16/ Types: Vendor Advisory
|
| Added |
Reference Type |
Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-17/ Types: Vendor Advisory
|
CVE Modified by Mozilla Corporation
2/24/2026 1:29:35 PM
| Action |
Type |
Old Value |
New Value |
| Changed |
Description |
Undefined behavior in the DOM: Core & HTML component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, and Firefox ESR < 140.8.
|
Undefined behavior in the DOM: Core & HTML component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
|
| Added |
Reference |
https://www.mozilla.org/security/advisories/mfsa2026-16/
|
| Added |
Reference |
https://www.mozilla.org/security/advisories/mfsa2026-17/
|
New CVE Received from Mozilla Corporation
2/24/2026 9:16:25 AM
| Action |
Type |
Old Value |
New Value |
| Added |
Description |
Undefined behavior in the DOM: Core & HTML component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, and Firefox ESR < 140.8.
|
| Added |
Reference |
https://bugzilla.mozilla.org/show_bug.cgi?id=2014593
|
| Added |
Reference |
https://www.mozilla.org/security/advisories/mfsa2026-13/
|
| Added |
Reference |
https://www.mozilla.org/security/advisories/mfsa2026-14/
|
| Added |
Reference |
https://www.mozilla.org/security/advisories/mfsa2026-15/
|
Quick Info
CVE Dictionary Entry: CVE-2026-2771 NVD
Published Date: 02/24/2026 NVD
Last Modified: 06/29/2026
Source: Mozilla Corporation
|
