CVE-2026-2778 (GCVE-0-2026-2778)

Vulnerability from cvelistv5 – Published: 2026-02-24 13:33 – Updated: 2026-06-30 12:08
VLAI
Title
Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component
Summary
Sandbox escape due to incorrect boundary conditions 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.
Severity
10 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Assigner
References
URL Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2016358
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://access.redhat.com/security/cve/CVE-2026-2778 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2442335 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… 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
Impacted products
Vendor Product Version
Mozilla Firefox Unaffected: 115.33 , ≤ 115.* (rpm)
Unaffected: 140.8 , ≤ 140.* (rpm)
Unaffected: 148 , ≤ * (rpm)
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Mozilla Thunderbird Unaffected: 140.8 , ≤ 140.* (rpm)
Unaffected: 148 , ≤ * (rpm)
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Red Hat Red Hat Enterprise Linux Server (v. 7 ELS)     cpe:/o:redhat:rhel_els:7
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Red Hat Red Hat Enterprise Linux AppStream EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux AppStream (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
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Red Hat Red Hat Enterprise Linux AppStream (v. 8)     cpe:/a:redhat:enterprise_linux:8::appstream
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Red Hat Red Hat Enterprise Linux AppStream AUS (v. 8.2)     cpe:/a:redhat:rhel_aus:8.2::appstream
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Red Hat Red Hat Enterprise Linux AppStream AUS (v.8.4)     cpe:/a:redhat:rhel_aus:8.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)     cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream AUS (v.8.6)     cpe:/a:redhat:rhel_aus:8.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.8.6)     cpe:/a:redhat:rhel_e4s:8.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream TUS (v.8.6)     cpe:/a:redhat:rhel_tus:8.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.8.8)     cpe:/a:redhat:rhel_e4s:8.8::appstream
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Red Hat Red Hat Enterprise Linux AppStream TUS (v.8.8)     cpe:/a:redhat:rhel_tus:8.8::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.0)     cpe:/a:redhat:rhel_e4s:9.0::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Credits
Sajeeb Lohani
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Tags
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.