CVE-2026-100788

DiscoveredSep 29, 2026UpdatedOct 1, 2026

Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.

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CVSS v3.1

9.8 CRITICAL

EPSS

0.41%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

EPSS Trend

Oct 2, 2026 → Oct 22, 2026

▲ 0.26pp

0.16% → 0.41% over 3 tracked changes

CVSS v3.1 Detail

Attack VectorNETWORK

Attack ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

ScopeUNCHANGED

ConfidentialityHIGH

IntegrityHIGH

AvailabilityHIGH

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

Connections

1 relationships

CWE-824

source

Timeline

disclosure → media coverage

Sep 29, 2026

Disclosure — published as a CVE record.