CVE-2026-7323

Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1

HIGH
7.3
CVSS Score
Published: April 28, 2026 at 01:49 PM UTC
Updated: October 26, 2026 at 12:10 AM UTC
3 products affected across 2 vendorsFirefoxThunderbirdEnterprise Linux

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Severity
HIGH7.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Memory safety bugs present in Firefox ESR 140.10.0, Thunderbird ESR 140.10.0, Firefox 150.0.0 and Thunderbird 150.0.0. 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 150.0.1 and Firefox ESR 140.10.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 140.10.1v < 150.0.1
Vendor states this is fixed in 140.10.1 (unaffected)
Vendor states this is fixed in 150.0.1 (unaffected)
v < 140.10.1v < 150.0.1
Vendor states this is fixed in 140.10.1 (unaffected)
Vendor states this is fixed in 150.0.1 (unaffected)
Vendor states this is fixed in 0:140.10.1-1.el10_0 (unaffected)
Vendor states this is fixed in 0:140.10.1-1.el10_2 (unaffected)
Vendor states this is fixed in 0:140.10.1-1.el7_9 (unaffected)
Vendor states this is fixed in 0:140.10.1-1.el8_10 (unaffected)
Vendor states this is fixed in 0:140.10.1-1.el8_4 (unaffected)
Vendor states this is fixed in 0:140.10.1-1.el8_6 (unaffected)
Vendor states this is fixed in 0:140.10.1-1.el8_8 (unaffected)
Vendor states this is fixed in 0:140.10.1-1.el9_0 (unaffected)
Vendor states this is fixed in 0:140.10.1-1.el9_2 (unaffected)
Vendor states this is fixed in 0:140.10.1-1.el9_4 (unaffected)
Vendor states this is fixed in 0:140.10.1-1.el9_6 (unaffected)
Vendor states this is fixed in 0:140.10.1-1.el9_8 (unaffected)
Vendor states this is fixed in 6 (unknown)
Vendor states this is fixed in 7 (unknown)

References (30)

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.3HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-119CWE-787

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