VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVPublished EPSS 0.2% probability of exploitation in 30 daysFound by AI: OpenAI
Mozilla

CVE-2026-117931: Use-after-free in the DOM: Events component

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?
0.2%

EPSS score, percentile 8.3 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
Not scored

The CVE record carries no CVSS score.

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Unaffected 115.44; 153.6; 159; 153.6; 159

Versions by product

Source: CISA KEV 2026.10.29, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

What to do

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

As listed in the CVE record.

Mozilla Firefox
StatusVersions
Unaffected115.44
Unaffected153.6
Unaffected159
Mozilla Thunderbird
StatusVersions
Unaffected153.6
Unaffected159

Versions the record lists as unaffected: 115.44, 153.6, 159.

Source: CVE List, as of . About the data.

About this vulnerability

Use-after-free in the DOM: Events component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Summary: CVE record, as of .

  • CISA has not added CVE-2026-117931 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
  • The CVE record was published on 27 Oct 2026.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.2% (percentile 8.3), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
  • The credits in the CVE record name OpenAI as finder.

Source: CISA KEV 2026.10.29, as of ; CVE List, as of ; FIRST EPSS, as of . About the data.

Description

Use-after-free in the DOM: Events component

Use-after-free in the DOM: Events component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Source: CVE List, as of . About the data.

Timeline

DateEvent
CVE record published

References

6

Known exploited Mozilla vulnerabilities

  • CVE-2010-3765: Mozilla Multiple Products Remote Code Execution Vulnerability (added )
  • CVE-2024-9680: Mozilla Firefox Use-After-Free Vulnerability (added )
  • CVE-2016-9079: Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability (added )
  • CVE-2015-4495: Mozilla Firefox Security Feature Bypass Vulnerability (added )
  • CVE-2019-11707: Mozilla Firefox and Thunderbird Type Confusion Vulnerability (added )