Skip to main content
Threat Radar animated logo

Mozjs52: Incorrect boundary conditions in the JavaScript Engine component. (CVE-2026-109716)

0
Medium
VulnerabilityCVE-2026-109716gcveosvubuntu-cve-2026-109716cve-2026-109716ubuntu-18-04-ltsubuntu-20-04-ltsubuntu-22-04-ltsubuntu-24-04-lts
Published: 10/15/2026 (10/15/2026, 00:00:00 UTC)
Source: GCVE Database
Product: mozjs52

Description

CVE-2026-109716 is a vulnerability involving incorrect boundary conditions in the JavaScript Engine component of mozjs52. This flaw was addressed and fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5. The vulnerability has a CVSS 3.1 score of 8.1, indicating a high impact on confidentiality and integrity, but no impact on availability. No known exploits are reported in the wild.

CVSS v3.1

Score 8.1high

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected software

Ubuntu:18.04:LTSmore threats →ghsa
mozjs52
pkg:deb/ubuntu/mozjs52?arch=source&distro=bionic
Affected versions
=52.3.1-0ubuntu3=52.3.1-7fakesync1=52.8.1-0ubuntu0.18.04.1=52.9.1-0ubuntu0.18.04.1
Ubuntu:18.04:LTSmore threats →ghsa
mozjs38
pkg:deb/ubuntu/mozjs38?arch=source&distro=bionic
Affected versions
=38.8.0~repack1-0ubuntu1=38.8.0~repack1-0ubuntu3=38.8.0~repack1-0ubuntu4
Ubuntu:20.04:LTSmore threats →ghsa
mozjs68
pkg:deb/ubuntu/mozjs68?arch=source&distro=focal
Affected versions
=68.5.0-1~fakesync=68.5.0-2~fakesync=68.6.0-1=68.6.0-1ubuntu1
Ubuntu:20.04:LTSmore threats →ghsa
mozjs52
pkg:deb/ubuntu/mozjs52?arch=source&distro=focal
Affected versions
=52.9.1-1build1=52.9.1-1ubuntu3
Ubuntu:22.04:LTSmore threats →ghsa
mozjs102
pkg:deb/ubuntu/mozjs102?arch=source&distro=jammy
Affected versions
=102.11.0-0ubuntu0.22.04.1=102.12.0-0ubuntu0.22.04.1=102.13.0-0ubuntu0.22.04.1=102.15.1-0ubuntu0.22.04.1
Ubuntu:22.04:LTSmore threats →ghsa
mozjs78
pkg:deb/ubuntu/mozjs78?arch=source&distro=jammy
Affected versions
=78.13.0-1=78.15.0-2=78.15.0-4ubuntu1
Ubuntu:22.04:LTSmore threats →ghsa
mozjs91
pkg:deb/ubuntu/mozjs91?arch=source&distro=jammy
Affected versions
=91.5.1-0ubuntu1=91.6.0-1=91.6.0-2=91.7.0-2=91.10.0-0ubuntu1
Ubuntu:22.04:LTSmore threats →ghsa
thunderbird
pkg:deb/ubuntu/thunderbird?arch=source&distro=jammy
Affected versions
=1:91.1.2+build1-0ubuntu1=1:91.3.0+build2-0ubuntu1=1:91.3.1+build1-0ubuntu1=1:91.3.2+build1-0ubuntu1=1:91.4.0+build1.1-0ubuntu1=1:91.4.0+build2-0ubuntu1=1:91.5.0+build1-0ubuntu1=1:91.5.1+build1-0ubuntu1=1:91.6.1+build1-0ubuntu1=1:91.7.0+build1-0ubuntu1=1:91.7.0+build2-0ubuntu1=1:91.8.0+build2-0ubuntu1=1:91.9.1+build1-0ubuntu0.22.04.1=1:91.11.0+build2-0ubuntu0.22.04.1=1:102.2.2+build1-0ubuntu0.22.04.1=1:102.4.2+build2-0ubuntu0.22.04.1=1:102.7.1+build2-0ubuntu0.22.04.1=1:102.8.0+build2-0ubuntu0.22.04.1=1:102.9.0+build1-0ubuntu0.22.04.1=1:102.10.0+build2-0ubuntu0.22.04.1=1:102.11.0+build1-0ubuntu0.22.04.1=1:102.13.0+build1-0ubuntu0.22.04.1=1:102.15.0+build1-0ubuntu0.22.04.1=1:102.15.1+build1-0ubuntu0.22.04.1=1:115.3.1+build1-0ubuntu0.22.04.2=1:115.4.1+build1-0ubuntu0.22.04.1=1:115.5.0+build1-0ubuntu0.22.04.1=1:115.6.0+build2-0ubuntu0.22.04.1=1:115.8.1+build1-0ubuntu0.22.04.1=1:115.9.0+build1-0ubuntu0.22.04.1=1:115.10.1+build1-0ubuntu0.22.04.1=1:115.11.0+build2-0ubuntu0.22.04.1=1:115.12.0+build3-0ubuntu0.22.04.1=1:115.13.0+build5-0ubuntu0.22.04.1=1:115.15.0+build1-0ubuntu0.22.04.1=1:115.16.0+build2-0ubuntu0.22.04.1=1:115.18.0+build1-0ubuntu0.22.04.1=1:128.12.0+build1-0ubuntu0.22.04.1=1:140.7.1+build1-0ubuntu0.22.04.1
Ubuntu:24.04:LTSmore threats →ghsa
mozjs102
pkg:deb/ubuntu/mozjs102?arch=source&distro=noble
Affected versions
=102.15.1-1=102.15.1-3ubuntu2
Ubuntu:24.04:LTSmore threats →ghsa
mozjs115
pkg:deb/ubuntu/mozjs115?arch=source&distro=noble
Affected versions
=115.3.0-0ubuntu1=115.4.0-2=115.5.0-1=115.6.0-1=115.7.0-4=115.8.0-1=115.9.0-1=115.9.0-1build1=115.10.0-1

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/22/2026, 17:38:34 UTC

Technical Analysis

This vulnerability is caused by incorrect boundary conditions in the JavaScript Engine component of mozjs52. It was fixed in Firefox 158 and corresponding ESR and Thunderbird versions. The CVSS 3.1 vector indicates it is remotely exploitable without privileges or user interaction, with high confidentiality and integrity impact. The Mozilla advisory confirms the fix and classifies the impact as high.

Potential Impact

Successful exploitation could lead to a high impact on confidentiality and integrity of the affected systems. The vulnerability is remotely exploitable without privileges or user interaction. There is no known exploitation in the wild at this time.

Mitigation Recommendations

A fix is available and has been released in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5. Users and administrators should update to these versions or later to remediate this vulnerability.

Pro Console: star threats, build custom feeds, automate alerts via Slack, email & webhooks.Upgrade to Pro

Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-109716
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS"]
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6ada45034d27ba8daa6a5af7

Added to database: 10/22/2026, 17:16:51 UTC

Last enriched: 10/22/2026, 17:38:34 UTC

Last updated: 10/22/2026, 17:38:34 UTC

Views: 2

Community Reviews

0 reviews

Crowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.

Sort by
Loading community insights…

Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.

Actions

PRO

Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.

Please log in to the Console to use AI analysis features.

Need more coverage?

Upgrade to Pro Console for AI refresh and higher limits.

For incident response and remediation, OffSeq services can help resolve threats faster.

Latest Threats

Breach by OffSeqOFFSEQFRIENDS — 25% OFF

Check if your credentials are on the dark web

Instant breach scanning across billions of leaked records. Free tier available.

Scan now
OffSeq TrainingCredly Certified

Lead Pen Test Professional

Technical5-day eLearningPECB Accredited
View courses