VulnerabilityPublished 27 Oct 2026

CVE-2026-117997: Sandbox Escape Due to Use-after-free

Source GCVE Database

Authoritative record:CVE-2026-117997· High

Not known to be exploited.

Data as of 27 Oct 2026, 16:57 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Exploitation evidence

Disclosed: evidence found.
CVE published 27 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-55fm-xj42-jvx7

What to do

AI-suggested

Users should update to Firefox 159 or later, or Firefox ESR 153.6 or later, where this vulnerability has been fixed. Applying these official fixes fully mitigates the risk from this vulnerability.

Description

CVE-2026-117997 is a high-impact vulnerability involving a use-after-free flaw in the Widget component of Firefox. This flaw allows sandbox escape, potentially enabling an attacker to break out of the browser's restricted environment. The issue was fixed in Firefox 159 and Firefox ESR 153.6.

References

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