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CVE-2026-4690

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component

HIGH
8.6
CVSS Score
Published: March 24, 2026 at 12:30 PM UTC
Updated: July 15, 2026 at 02:22 AM UTC
2 products affected across 2 vendorsFirefoxEnterprise Linux

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Severity
HIGH8.6
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 115.34.0v < 149.0128.0 ≤ v < 140.9.0
Vendor states this is fixed in 115.34 (unaffected)
Affected range stops below 115.34.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 140.9 (unaffected)
Affected range stops below 140.9.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 149 (unaffected)
Affected range stops below 149.0, so it looks safe — our inference, not a vendor statement
Enterprise Linux· Red Hatrpm
60%
10
Vendor states this is fixed in 0:140.9.0-1.el10_0 (unaffected)
Vendor states this is fixed in 0:140.9.0-1.el10_1 (unaffected)
Vendor states this is fixed in 0:140.9.0-1.el7_9 (unaffected)
Vendor states this is fixed in 0:140.9.0-1.el8_10 (unaffected)
Vendor states this is fixed in 0:140.9.0-1.el8_2 (unaffected)
Vendor states this is fixed in 0:140.9.0-1.el8_4 (unaffected)
Vendor states this is fixed in 0:140.9.0-1.el8_6 (unaffected)
Vendor states this is fixed in 0:140.9.0-1.el8_8 (unaffected)
Vendor states this is fixed in 0:140.9.0-1.el9_0 (unaffected)
Vendor states this is fixed in 0:140.9.0-1.el9_2 (unaffected)
Vendor states this is fixed in 0:140.9.0-1.el9_4 (unaffected)
Vendor states this is fixed in 0:140.9.0-1.el9_6 (unaffected)
Vendor states this is fixed in 0:140.9.0-1.el9_7 (unaffected)
Vendor states this is fixed in 6 (unknown)
Vendor states this is fixed in 7 (unknown)

References (34)

Vendor Advisory
Source: cverecord
https://bugzilla.mozilla.org/show_bug.cgi?id=2016375
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-20/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-21/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-22/
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-23/
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-24/
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:5930
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:5931

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.6HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-190CWE-754CWE-120

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