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Vulnerabilities

Vulnerability · CVE-2026-2798

Use-after-free in the DOM: Core & HTML component.

Published Feb 24, 2026 · catalog updated Jul 15, 2026 · Use-after-free in the DOM:

Check if you run it

No confirmed exploitation is on record for CVE-2026-2798. EPSS is 0.47%. Act only if a listed version of Use-after-free in the DOM: is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Use-after-free in the DOM:).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.47%
Remediation
Advisory link
Affected products
cpe mozilla/firefox · cpe mozilla/thunderbird

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe mozilla/firefoxversion unspecified
  • cpe mozilla/thunderbirdversion unspecified

How to fix CVE-2026-2798

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-2798. EPSS is 0.47%. Act only if a listed version of Use-after-free in the DOM: is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-416: Use After Free. EPSS 0.47%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 24, 2026 · NIST NVD

    Detected

    Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

  2. Jul 15, 2026 · NIST NVD

    Updated

    Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

Sources

  • CVE.orgVulnerability recordCVE-2026-2798

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-2798

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-2798

    Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.