CVE-2026-10702Known exploitationPublic exploitNetwork attack vector

Renderer code execution via stale slots pointer

Published Jun 2, 2026 · Updated Jun 2, 2026

JIT miscompilation in Firefox before 151.0.3 allows remote attackers to execute code in the renderer by opening a crafted webpage. SpiderMonkey's MObjectToIterator marks a mutation-capable operation as read-only, so global value numbering reuses a dynamic-slots pointer after lazy property resolution reallocates and frees its buffer. Opening attacker-controlled content is required, and the documented primitive grants memory read and write within the sandboxed renderer process.

CVSS severity7.5
High
EPSS probability0.86%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

JIT miscompilation in Firefox before 151.0.3 allows remote attackers to execute code in the renderer by opening a crafted webpage. SpiderMonkey's MObjectToIterator marks a mutation-capable operation as read-only, so global value numbering reuses a dynamic-slots pointer after lazy property resolution reallocates and frees its buffer. Opening attacker-controlled content is required, and the documented primitive grants memory read and write within the sandboxed renderer process.

The record

CVE
CVE-2026-10702
Published
Jun 2, 2026
Updated
Jun 2, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-843, CWE-733, T1203, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 2026Record updatedLatest update available in the CVE record.
  3. Jul 10, 2026Exploitation reportedNebula Security Firefox and Tor Browser demonstrations

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5Red Hat SADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
4.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
CWE-733Compiler Optimization Removal or Modification of Security-critical Code
T1203Exploitation for Client Execution
T1189Drive-by Compromise

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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