Vulnerability details
CVE-2026-2771
Red Hat Enterprise Linux 10
Undefined behavior in the DOM: Core & HTML component
CVSS 3.1
7.5High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.8Critical | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (redhat-SADP) | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Enterprise Linux 10 | All | CVEProject cvelistV5 (CNA) |
References and advisories
34- https://bugzilla.mozilla.org/show_bug.cgi?id=2014593
- https://www.mozilla.org/security/advisories/mfsa2026-13/
- https://www.mozilla.org/security/advisories/mfsa2026-14/
- https://www.mozilla.org/security/advisories/mfsa2026-15/
- https://www.mozilla.org/security/advisories/mfsa2026-16/
- https://www.mozilla.org/security/advisories/mfsa2026-17/
- https://access.redhat.com/security/cve/CVE-2026-2771 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2442288 issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2771.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:3984 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3976 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:4260 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3361 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3517 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3338 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3515 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3492 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:4432 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3491 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3980 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3495 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3979 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3494 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:4022 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3493 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3983 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:4152 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3978 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3496 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3981 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3497 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3982 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3339 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3516 vendor-advisoryx_refsource_REDHAT
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Details
- Published
- 2026-02-24
- Last updated
- 2026-09-21
- State
- Published
- Assigner (CNA)
- mozilla
Exploit prediction (EPSS)
0.75%
Probability of exploitation in 30 days
55.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-125Out-of-bounds Read