Staging Environment: Content and features may be unstable or change without notice.
Search for vulnerabilities
Vulnerability details: VCID-6fsa-bnes-tkff
Vulnerability ID VCID-6fsa-bnes-tkff
Aliases CVE-2026-2765
Summary Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
Status Published
Exploitability 0.5
Weighted Severity 8.8
Risk 4.4
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-2765.json
epss 0.00023 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00023 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00023 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00023 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00023 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00023 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00023 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00023 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00023 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00023 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00023 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00023 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00023 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00023 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00024 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00024 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00024 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00024 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00024 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00024 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
epss 0.00024 https://api.first.org/data/v1/epss?cve=CVE-2026-2765
cvssv3.1 9.8 https://bugzilla.mozilla.org/show_bug.cgi?id=2013562
ssvc Track https://bugzilla.mozilla.org/show_bug.cgi?id=2013562
cvssv3.1 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2026-13
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2026-15
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2026-16
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2026-17
cvssv3.1 9.8 https://www.mozilla.org/security/advisories/mfsa2026-13/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2026-13/
cvssv3.1 9.8 https://www.mozilla.org/security/advisories/mfsa2026-15/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2026-15/
cvssv3.1 9.8 https://www.mozilla.org/security/advisories/mfsa2026-16/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2026-16/
cvssv3.1 9.8 https://www.mozilla.org/security/advisories/mfsa2026-17/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2026-17/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-2765.json
https://api.first.org/data/v1/epss?cve=CVE-2026-2765
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2765
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
2442333 https://bugzilla.redhat.com/show_bug.cgi?id=2442333
mfsa2026-13 https://www.mozilla.org/en-US/security/advisories/mfsa2026-13
mfsa2026-13 https://www.mozilla.org/security/advisories/mfsa2026-13/
mfsa2026-15 https://www.mozilla.org/en-US/security/advisories/mfsa2026-15
mfsa2026-15 https://www.mozilla.org/security/advisories/mfsa2026-15/
mfsa2026-16 https://www.mozilla.org/en-US/security/advisories/mfsa2026-16
mfsa2026-16 https://www.mozilla.org/security/advisories/mfsa2026-16/
mfsa2026-17 https://www.mozilla.org/en-US/security/advisories/mfsa2026-17
mfsa2026-17 https://www.mozilla.org/security/advisories/mfsa2026-17/
RHSA-2026:3338 https://access.redhat.com/errata/RHSA-2026:3338
RHSA-2026:3339 https://access.redhat.com/errata/RHSA-2026:3339
RHSA-2026:3361 https://access.redhat.com/errata/RHSA-2026:3361
RHSA-2026:3491 https://access.redhat.com/errata/RHSA-2026:3491
RHSA-2026:3492 https://access.redhat.com/errata/RHSA-2026:3492
RHSA-2026:3493 https://access.redhat.com/errata/RHSA-2026:3493
RHSA-2026:3494 https://access.redhat.com/errata/RHSA-2026:3494
RHSA-2026:3495 https://access.redhat.com/errata/RHSA-2026:3495
RHSA-2026:3496 https://access.redhat.com/errata/RHSA-2026:3496
RHSA-2026:3497 https://access.redhat.com/errata/RHSA-2026:3497
RHSA-2026:3515 https://access.redhat.com/errata/RHSA-2026:3515
RHSA-2026:3516 https://access.redhat.com/errata/RHSA-2026:3516
RHSA-2026:3517 https://access.redhat.com/errata/RHSA-2026:3517
RHSA-2026:3976 https://access.redhat.com/errata/RHSA-2026:3976
RHSA-2026:3978 https://access.redhat.com/errata/RHSA-2026:3978
RHSA-2026:3979 https://access.redhat.com/errata/RHSA-2026:3979
RHSA-2026:3980 https://access.redhat.com/errata/RHSA-2026:3980
RHSA-2026:3981 https://access.redhat.com/errata/RHSA-2026:3981
RHSA-2026:3982 https://access.redhat.com/errata/RHSA-2026:3982
RHSA-2026:3983 https://access.redhat.com/errata/RHSA-2026:3983
RHSA-2026:3984 https://access.redhat.com/errata/RHSA-2026:3984
RHSA-2026:4022 https://access.redhat.com/errata/RHSA-2026:4022
RHSA-2026:4152 https://access.redhat.com/errata/RHSA-2026:4152
RHSA-2026:4260 https://access.redhat.com/errata/RHSA-2026:4260
RHSA-2026:4432 https://access.redhat.com/errata/RHSA-2026:4432
show_bug.cgi?id=2013562 https://bugzilla.mozilla.org/show_bug.cgi?id=2013562
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-2765.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://bugzilla.mozilla.org/show_bug.cgi?id=2013562
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-02-28T02:30:09Z/ Found at https://bugzilla.mozilla.org/show_bug.cgi?id=2013562
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.mozilla.org/security/advisories/mfsa2026-13/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-02-28T02:30:09Z/ Found at https://www.mozilla.org/security/advisories/mfsa2026-13/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.mozilla.org/security/advisories/mfsa2026-15/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-02-28T02:30:09Z/ Found at https://www.mozilla.org/security/advisories/mfsa2026-15/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.mozilla.org/security/advisories/mfsa2026-16/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-02-28T02:30:09Z/ Found at https://www.mozilla.org/security/advisories/mfsa2026-16/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.mozilla.org/security/advisories/mfsa2026-17/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-02-28T02:30:09Z/ Found at https://www.mozilla.org/security/advisories/mfsa2026-17/
Exploit Prediction Scoring System (EPSS)
Percentile 0.06107
EPSS Score 0.00023
Published At April 2, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T13:16:34.562532+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2026/mfsa2026-15.yml 38.0.0