CVE-2026-8973
published 2026-05-19CVE-2026-8973: Memory safety bugs present in Firefox 150. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could…
PriorityP347high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.34%
25.7th percentile
Memory safety bugs present in 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 and Thunderbird 151.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 151 | Firefox 151 |
| mozilla | firefox | < 151.0.0 | 151.0.0 |
| mozilla | thunderbird | < Thunderbird 151 | Thunderbird 151 |
| mozilla | thunderbird | < 151.0.0 | 151.0.0 |
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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Red Hat
firefox: thunderbird: Memory safety bugs fixed in Firefox 151
vendor_redhat·2026-05-19·CVSS 8.8
CVE-2026-8973 [HIGH] CWE-787 firefox: thunderbird: Memory safety bugs fixed in Firefox 151
firefox: thunderbird: Memory safety bugs fixed in Firefox 151
Memory safety bugs present in 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 and Thunderbird 151.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Memory safety bugs present in Thunderbird 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
Mozilla
Mozilla Foundation Security Advisory 2026-46: CVE-2026-8973
vendor_mozilla·CVSS 9.8
CVE-2026-8973 [CRITICAL] Mozilla Foundation Security Advisory 2026-46: CVE-2026-8973
Mozilla Foundation Security Advisory 2026-46
CVE: CVE-2026-8973
Product: Firefox
Impact: high
Fixed in: Firefox 151
Mozilla
Mozilla Foundation Security Advisory 2026-50: CVE-2026-8973
vendor_mozilla·CVSS 9.8
CVE-2026-8973 [CRITICAL] Mozilla Foundation Security Advisory 2026-50: CVE-2026-8973
Mozilla Foundation Security Advisory 2026-50
CVE: CVE-2026-8973
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 151
VulDB
Mozilla Firefox up to 150 memory corruption (EUVD-2026-30923 / Nessus ID 315327)
vuldb·2026-05-20·CVSS 9.8
CVE-2026-8973 [CRITICAL] Mozilla Firefox up to 150 memory corruption (EUVD-2026-30923 / Nessus ID 315327)
A vulnerability has been found in Mozilla Firefox up to 150 and classified as critical. This affects an unknown function. Performing a manipulation results in memory corruption.
This vulnerability is reported as CVE-2026-8973. The attack is possible to be carried out remotely. No exploit exists.
The affected component should be upgraded.
GHSA
GHSA-f4hm-8h94-gvp6: Memory safety bugs present in Firefox 150
ghsa_unreviewed·2026-05-19
CVE-2026-8973 [CRITICAL] CWE-119 GHSA-f4hm-8h94-gvp6: Memory safety bugs present in Firefox 150
Memory safety bugs present in 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.
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1362365%2C1860538%2C1929005%2C1983353%2C1998526%2C2023271%2C2023943%2C2024244%2C2024260%2C2024443%2C2024665%2C2024774%2C2024916%2C2025346%2C2025357%2C2025406%2C2025434%2C2025488%2C2025496%2C2025942%2C2025947%2C2025968%2C2026279%2C2027159%2C2027239%2C2027276%2C2027308%2C2027310%2C2027324%2C2027329%2C2027363%2C2027381%2C2027382%2C2027383%2C2028274%2C2028884%2C2029060%2C2029065%2C2029068%2C2029281%2C2029293%2C2029297%2C2029303%2C2029439%2C2029448%2C2029703%2C2029720%2C2029721%2C2029723%2C2029770%2C2029771%2C2029782%2C2029818%2C2029885%2C2030100%2C2030379%2C2030385%2C2030979%2C2031119%2C2031122%2C2034119%2C2034791%2C2035209%2C2036666%2C2037986https://www.mozilla.org/security/advisories/mfsa2026-46/https://www.mozilla.org/security/advisories/mfsa2026-50/https://access.redhat.com/security/cve/CVE-2026-8973https://bugzilla.redhat.com/show_bug.cgi?id=2479864https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8973.json
2026-05-19
Published