CVE-2026-16360CWE-119

CVE-2026-16360

Critical · published July 21, 2026

CVSS v3.1
9.8
EPSS
0%
Percentile
39.6
In the wild
Unconfirmed
What it is

Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152. 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 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00468 · 39.6th percentile
Weakness
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer
Published
2026-07-21T17:17Z
Affected products (5)
ProductVersionsFixed in
mozilla/firefox< 115.38.0115.38.0
mozilla/firefox< 153.0.0153.0.0
mozilla/firefox≥ 128.1.0, < 140.13.0140.13.0
mozilla/thunderbird< 140.13.0140.13.0
mozilla/thunderbird≥ 141.0, < 153.0153.0
References (7)
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2022635%2C2028004%2C2035756%2C2045184%2C2045185%2C2045198%2C2045392%2C2045395%2C2045396%2C2045397%2C2045405%2C2045414%2C2045415%2C2045451%2C2045454%2C2045508%2C2045510%2C2045513%2C2045515%2C2045518%2C2045604%2C2045607%2C2045612%2C2045617%2C2045619%2C2045624%2C2045625%2C2045729%2C2045737%2C2045741%2C2045742%2C2045763%2C2045767%2C2045770%2C2045772%2C2045773%2C2045783%2C2045833%2C2045848%2C2045865%2C2045875%2C2045957%2C2047723%2C2047729%2C2048795%2C2048799%2C2048801%2C2049392%2C2049397%2C2049398%2C2049399%2C2049404%2C2049405%2C2049407%2C2049812%2C2050657%2C2050668%2C2050990%2C2053166%2C2053273%2C2053576%2C2053583%2C2053587 · [email protected]https://bugzilla.mozilla.org/buglist.cgi?bug_id=2043739%2C2045281%2C2045614%2C2045744%2C2045775%2C2047719%2C2049805%2C2051666 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-68/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-69/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-70/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-71/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-72/ · [email protected]
EPSS history
Timeline
  • 21 JUL 12:38Z
    Memory safety bugs fixed in Firefox ESR 115.38, Firefox ESR 140.13 and Firefox 153
    cvelistv5