01 Record

CVE-2026-16360

Memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153

CriticalPUBLISHEDCNA: mozilla

CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

View raw JSON

02 Description

Memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.60% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 48.8% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-10-24.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-07-21 12:38Z3 MO AGO

Last updated

2026-10-21 13:49Z7 DAYS AGO

Reserved

2026-07-20

Assigning CNA

mozilla

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass

Data version

5.2

Document digest

0525a0dfa35b0c38873fe6d560ca869c043669da7832cc11cea922a6b62f5532

05 Affected products

VendorProductVersionsPlatforms

MozillaFirefoxNot specified—

MozillaThunderbirdNot specified—

06 References

bugzilla.mozilla.orgHigh-severity memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153https://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
bugzilla.mozilla.orgModerate-severity memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153https://bugzilla.mozilla.org/buglist.cgi?bug_id=2043739%2C2045281%2C2045614%2C2045744%2C2045775%2C2047719%2C2049805%2C2051666
www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-68/
www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-69/
www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-70/
www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-71/
www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-72/

07 Fixed in

AlmaLinux 8

firefox
Fixed in 140.13.0-1.el8_10.alma.1
thunderbird
Fixed in 140.13.0-1.el8_10.alma.1

AlmaLinux 9

firefox
Fixed in 140.13.0-1.el9_8.alma.1
firefox-x11
Fixed in 140.13.0-1.el9_8.alma.1
thunderbird
Fixed in 140.13.0-1.el9_8.alma.1

AlmaLinux 10

firefox
Fixed in 140.13.0-1.el10_2
thunderbird
Fixed in 140.13.0-1.el10_2.alma.1

CloudLinux 8

firefox
Fixed in 140.13.0-1.el8_10.alma.1
thunderbird
Fixed in 140.13.0-1.el8_10.alma.1

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

CloudLinux 9

firefox
Fixed in 140.13.0-1.el9_8.alma.1
firefox-x11
Fixed in 140.13.0-1.el9_8.alma.1
thunderbird
Fixed in 140.13.0-1.el9_8.alma.1

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

CloudLinux 10

firefox
Fixed in 140.13.0-1.el10_2
thunderbird
Fixed in 140.13.0-1.el10_2.alma.1

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Debian 12

firefox-esr
Fixed in 140.13.0esr-1~deb12u1
thunderbird
Fixed in 1:140.13.0esr-2~deb12u1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

firefox-esr
Fixed in 140.13.0esr-1~deb13u1
thunderbird
Fixed in 1:140.13.0esr-2~deb13u1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

firefox-esr
Fixed in 140.13.0esr-1
thunderbird
Fixed in 1:140.13.0esr-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

mozjs38
No fix yet
mozjs52
No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

mozjs52
No fix yet
mozjs68
No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

mozjs102
No fix yet
mozjs78
No fix yet
mozjs91
No fix yet
thunderbird
No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

mozjs102
No fix yet
mozjs115
No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.