CVE-2026-8975
published 2026-05-19CVE-2026-8975: Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. Some of these bugs showed evidence of memory corruption and we presume…
PriorityP347high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.43%
34.8th percentile
Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 151 | Firefox 151 |
| mozilla | firefox | < 115.36.0 | 115.36.0 |
| mozilla | firefox | < 151.0.0 | 151.0.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 140.0 < 140.11.0 | 140.11.0 |
| mozilla | firefox_esr | < Firefox ESR 140.11 | Firefox ESR 140.11 |
| mozilla | firefox_esr | < Firefox ESR 115.36 | Firefox ESR 115.36 |
| mozilla | thunderbird | < Thunderbird 140.11 | Thunderbird 140.11 |
| mozilla | thunderbird | < Thunderbird 151 | Thunderbird 151 |
| mozilla | thunderbird | < 140.11 | 140.11 |
| mozilla | thunderbird | < 151.0.0 | 151.0.0 |
| rhel10 | firefox-flatpak | — | — |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vendor_redhat8.8HIGH
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VulDB
Mozilla Firefox up to 150 memory corruption (Nessus ID 315327)
vuldb·2026-05-20·CVSS 9.8
CVE-2026-8975 [CRITICAL] Mozilla Firefox up to 150 memory corruption (Nessus ID 315327)
A vulnerability was found in Mozilla Firefox up to 150. It has been classified as critical. Affected is an unknown function. The manipulation leads to memory corruption.
This vulnerability is traded as CVE-2026-8975. It is possible to initiate the attack remotely. There is no exploit available.
Upgrading the affected component is recommended.
GHSA
GHSA-v6hv-5rrm-2f28: Memory safety bugs present in Firefox ESR 115
ghsa_unreviewed·2026-05-19
CVE-2026-8975 [CRITICAL] CWE-119 GHSA-v6hv-5rrm-2f28: Memory safety bugs present in Firefox ESR 115
Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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 151, Firefox ESR 115.36, and Firefox ESR 140.11.
Red Hat
firefox: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151
vendor_redhat·2026-05-19·CVSS 8.8
CVE-2026-8975 [HIGH] CWE-787 firefox: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151
firefox: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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.
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: firefox (Red Hat Enterprise Linux 6) - Out of support scope
Package: firefox (Red Hat En
Mozilla
Mozilla Foundation Security Advisory 2026-46: CVE-2026-8975
vendor_mozilla·CVSS 9.8
CVE-2026-8975 [CRITICAL] Mozilla Foundation Security Advisory 2026-46: CVE-2026-8975
Mozilla Foundation Security Advisory 2026-46
CVE: CVE-2026-8975
Product: Firefox
Impact: high
Fixed in: Firefox 151
Mozilla
Mozilla Foundation Security Advisory 2026-48: CVE-2026-8975
vendor_mozilla·CVSS 9.8
CVE-2026-8975 [CRITICAL] Mozilla Foundation Security Advisory 2026-48: CVE-2026-8975
Mozilla Foundation Security Advisory 2026-48
CVE: CVE-2026-8975
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.11
Mozilla
Mozilla Foundation Security Advisory 2026-47: CVE-2026-8975
vendor_mozilla·CVSS 9.8
CVE-2026-8975 [CRITICAL] Mozilla Foundation Security Advisory 2026-47: CVE-2026-8975
Mozilla Foundation Security Advisory 2026-47
CVE: CVE-2026-8975
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.36
Mozilla
Mozilla Foundation Security Advisory 2026-51: CVE-2026-8975
vendor_mozilla·CVSS 9.8
CVE-2026-8975 [CRITICAL] Mozilla Foundation Security Advisory 2026-51: CVE-2026-8975
Mozilla Foundation Security Advisory 2026-51
CVE: CVE-2026-8975
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.11
Mozilla
Mozilla Foundation Security Advisory 2026-50: CVE-2026-8975
vendor_mozilla·CVSS 9.8
CVE-2026-8975 [CRITICAL] Mozilla Foundation Security Advisory 2026-50: CVE-2026-8975
Mozilla Foundation Security Advisory 2026-50
CVE: CVE-2026-8975
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 151
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1860195%2C2029325%2C2029429%2C2029910%2C2035915%2C2038678%2C2038669https://www.mozilla.org/security/advisories/mfsa2026-46/https://www.mozilla.org/security/advisories/mfsa2026-47/https://www.mozilla.org/security/advisories/mfsa2026-48/https://www.mozilla.org/security/advisories/mfsa2026-50/https://www.mozilla.org/security/advisories/mfsa2026-51/https://access.redhat.com/errata/RHSA-2026:21378https://access.redhat.com/errata/RHSA-2026:21380https://access.redhat.com/errata/RHSA-2026:21381https://access.redhat.com/errata/RHSA-2026:21382https://access.redhat.com/errata/RHSA-2026:22325https://access.redhat.com/errata/RHSA-2026:22643https://access.redhat.com/errata/RHSA-2026:26174https://access.redhat.com/errata/RHSA-2026:26268https://access.redhat.com/errata/RHSA-2026:26269https://access.redhat.com/errata/RHSA-2026:26270https://access.redhat.com/errata/RHSA-2026:26491https://access.redhat.com/errata/RHSA-2026:26492https://access.redhat.com/errata/RHSA-2026:26493https://access.redhat.com/errata/RHSA-2026:26521https://access.redhat.com/errata/RHSA-2026:26536https://access.redhat.com/errata/RHSA-2026:26539https://access.redhat.com/errata/RHSA-2026:26551https://access.redhat.com/errata/RHSA-2026:26606https://access.redhat.com/errata/RHSA-2026:26629https://access.redhat.com/errata/RHSA-2026:26630https://access.redhat.com/errata/RHSA-2026:27715https://access.redhat.com/security/cve/CVE-2026-8975https://bugzilla.redhat.com/show_bug.cgi?id=2479840https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8975.json
2026-05-19
Published