CVE-2026-4721 (GCVE-0-2026-4721)

Vulnerability from cvelistv5 – Published: 2026-03-24 12:30 – Updated: 2026-06-30 03:18
VLAI
Title
Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149
Summary
Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. 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, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
  • CWE-825 - Expired Pointer Dereference
Assigner
References
URL Tags
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2…
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-2026-4721 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2450711 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:8427 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7843 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8315 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:5931 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6342 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:5932 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6917 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7840 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8285 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7858 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8850 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7842 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8289 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7838 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8288 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7839 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8286 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7841 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8287 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7845 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8290 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7837 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8284 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:5930 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6188 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
Mozilla Firefox Unaffected: 115.34 , ≤ 115.* (rpm)
Unaffected: 140.9 , ≤ 140.* (rpm)
Unaffected: 149 , ≤ * (rpm)
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Mozilla Thunderbird Unaffected: 140.9 , ≤ 140.* (rpm)
Unaffected: 149 , ≤ * (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
Christian Holler, Timothy Nikkel, Tom Schuster and the Mozilla Fuzzing Team
Show details on NVD website

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}


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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

Author Source Type Date Other

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.

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Detection rules are retrieved from Rulezet.

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