No exploitation reportedFix available

CVE-2026-106016

Q: Is CVE-2026-106016 actively exploited?

Active exploitation of CVE-2026-106016 has not been confirmed. Its EPSS score was 0.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2026-106016?

CVE-2026-106016 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Mitigation bypass in the File Handling component

No exploitation reported by the sources we read.

Published2026-10-06
Fixed in157.0.1
WeaknessCWE-693

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 157.0.1 and Thunderbird 158.

Timeline

dates in UTC

2026-10-0613:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-106016?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-106016?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Mozilla firefox

Branch	Affected	Fixed in	Source
157.0	< 157.0.1	157.0.1	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Mozilla firefox to 157.0.1

Advisories and patches

www.mozilla.orgVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionnone2026-10-07
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.19.82026-10-07
CISA-ADPweakness (CWE)CWE-6932026-10-07
FIRST EPSSEPSS score0.3 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2026-10-06
Last Modified: 2026-10-13
NVD status: Modified

Frequently asked questions

What is CVE-2026-106016?

Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 157.0.1 and Thunderbird 158.

Is CVE-2026-106016 actively exploited?

Active exploitation of CVE-2026-106016 has not been confirmed. Its EPSS score was 0.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-106016?

CVE-2026-106016 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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