CVE-2026-16361
published 2026-07-21CVE-2026-16361: Memory safety bugs present in Thunderbird ESR 140.12. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of…
PriorityP355critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.31%
23.2th percentile
Memory safety bugs present in Thunderbird ESR 140.12. 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 ESR 115.38, Firefox ESR 140.13, and Thunderbird 140.13.
Affected
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < 115.38.0 | 115.38.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 128.1.0 < 140.13.0 | 140.13.0 |
| mozilla | firefox_esr | < Firefox ESR 140.13 | Firefox ESR 140.13 |
| mozilla | firefox_esr | < Firefox ESR 115.38 | Firefox ESR 115.38 |
| mozilla | thunderbird | < Thunderbird 140.13 | Thunderbird 140.13 |
| mozilla | thunderbird | < 140.13.0 | 140.13.0 |
| mozilla | thunderbird | — | — |
| rhel10 | firefox-flatpak | — | — |
| rhel10 | thunderbird-flatpak | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_redhat9.8CRITICAL
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GHSA
Memory safety bugs present in Firefox ESR 115.37 and Firefox ESR 140.12.
ghsa_unreviewed·2026-07-21
CVE-2026-16361 [CRITICAL] CWE-119 Memory safety bugs present in Firefox ESR 115.37 and Firefox ESR 140.12.
Memory safety bugs present in Firefox ESR 115.37 and Firefox ESR 140.12. 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 ESR 115.38 and Firefox ESR 140.13.
Red Hat
firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38 and Firefox ESR 140.13
vendor_redhat·2026-07-21·CVSS 9.8
CVE-2026-16361 [CRITICAL] firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38 and Firefox ESR 140.13
firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38 and Firefox ESR 140.13
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Memory safety bugs present in Thunderbird ESR 140.12. 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: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: thunderbird (Red Hat Enterp
Mozilla
Mozilla Foundation Security Advisory 2026-72: CVE-2026-16361
vendor_mozilla
CVE-2026-16361 Mozilla Foundation Security Advisory 2026-72: CVE-2026-16361
Mozilla Foundation Security Advisory 2026-72
CVE: CVE-2026-16361
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.13
Mozilla
Mozilla Foundation Security Advisory 2026-70: CVE-2026-16361
vendor_mozilla·CVSS 9.8
CVE-2026-16361 [CRITICAL] Mozilla Foundation Security Advisory 2026-70: CVE-2026-16361
Mozilla Foundation Security Advisory 2026-70
CVE: CVE-2026-16361
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.13
Mozilla
Mozilla Foundation Security Advisory 2026-69: CVE-2026-16361
vendor_mozilla·CVSS 9.8
CVE-2026-16361 [CRITICAL] Mozilla Foundation Security Advisory 2026-69: CVE-2026-16361
Mozilla Foundation Security Advisory 2026-69
CVE: CVE-2026-16361
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.38
No detection rules found.
No public exploits indexed.
2026-07-21
Published