CVE-2026-16361Network attack vector

Arbitrary code execution via memory corruption

Published Jul 21, 2026 · Updated Jul 21, 2026

Memory corruption in Mozilla Firefox ESR 115.37 and 140.12 allows remote attackers to execute arbitrary code through malicious web content. Mozilla identifies two fuzzing-discovered memory-safety defects but does not disclose the affected components or unsafe operations on attacker-controlled input. The defects also affect Thunderbird ESR 140.12; exploitation generally requires browser-like content because scripting is disabled while reading email.

CVSS severity9.8
Critical
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Mozilla Firefox ESR 115.37 and 140.12 allows remote attackers to execute arbitrary code through malicious web content. Mozilla identifies two fuzzing-discovered memory-safety defects but does not disclose the affected components or unsafe operations on attacker-controlled input. The defects also affect Thunderbird ESR 140.12; exploitation generally requires browser-like content because scripting is disabled while reading email.

The record

CVE
CVE-2026-16361
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2026Record updatedLatest update available in the CVE record.

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

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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 exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

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Your stack

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