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CVE.org (no NVD analysis yet)· CNA mozilla

CVE-2026-109708: Sandbox escape due to incorrect boundary conditions in the Networking component

CriticalCVSS 9.6 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 38/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.33% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: firefox (AlmaLinux:10) 153.5.0-1.el10_2; firefox (AlmaLinux:8) 153.5.0-1.el8_10; firefox (AlmaLinux:9) 153.5.0-1.el9_8.

Low priority for now. Upgrade to firefox (AlmaLinux:10) 153.5.0-1.el10_2; firefox (AlmaLinux:8) 153.5.0-1.el8_10; firefox (AlmaLinux:9) 153.5.0-1.el9_8 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.

Published
Oct 13, 2026
Updated
Oct 27, 2026
EPSS
0.3% · 27th percentile

Report tools

JSON

Action score

38

Monitor

Low priority for now.

CVSS
38 / 40 · 9.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-109708

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

  • Mozilla Firefox

    • 115.44 and later · up to and including 115.*not affected · rpm
    • 153.5 and later · up to and including 153.*not affected · rpm
    • 158 and laternot affected · rpm

  • Mozilla Thunderbird

    • 153.5 and later · up to and including 153.*not affected · rpm
    • 158 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10firefoxbefore 153.5.0-1.el10_2153.5.0-1.el10_2
AlmaLinux:8firefoxbefore 153.5.0-1.el8_10153.5.0-1.el8_10
AlmaLinux:9firefoxbefore 153.5.0-1.el9_8153.5.0-1.el9_8
AlmaLinux:9firefox-x11before 153.5.0-1.el9_8153.5.0-1.el9_8
AlmaLinux:9thunderbirdbefore 153.5.0-1.el9_8.alma.1153.5.0-1.el9_8.alma.1
Debian:12firefox-esrbefore 153.5.0esr-1~deb12u1153.5.0esr-1~deb12u1
Debian:12thunderbirdbefore 1:153.5.1esr-1~deb12u11:153.5.1esr-1~deb12u1
Debian:13firefox-esrbefore 153.5.0esr-1~deb13u1153.5.0esr-1~deb13u1
Debian:13thunderbirdbefore 1:153.5.1esr-1~deb13u11:153.5.1esr-1~deb13u1
Debian:14firefox-esrbefore 153.5.0esr-1153.5.0esr-1
Debian:14thunderbirdbefore 1:153.5.0esr-11:153.5.0esr-1
openSUSE:Leap 16.0MozillaFirefoxbefore 153.5.0-160000.1.1153.5.0-160000.1.1
openSUSE:Tumbleweedfirefox-esrbefore 153.5.0-1.1153.5.0-1.1
openSUSE:TumbleweedMozillaFirefoxbefore 158.0-1.1158.0-1.1
openSUSE:TumbleweedMozillaThunderbirdbefore 153.5.1-1.1153.5.1-1.1
Rocky Linux:10firefoxbefore 0:153.5.0-1.el10_20:153.5.0-1.el10_2
Rocky Linux:8firefoxbefore 0:153.5.0-1.el8_100:153.5.0-1.el8_10
Rocky Linux:9firefoxbefore 0:153.5.0-1.el9_80:153.5.0-1.el9_8
Rocky Linux:9thunderbirdbefore 0:153.5.0-1.el9_80:153.5.0-1.el9_8
SUSE:Linux Enterprise Module for Desktop Applications 15 SP7MozillaFirefoxbefore 153.5.0-150400.157.16.1153.5.0-150400.157.16.1
SUSE:Linux Enterprise Module for Package Hub 15 SP7MozillaThunderbirdbefore 153.5.0-150400.13.9.1153.5.0-150400.13.9.1
SUSE:Linux Enterprise Server 12 SP5-LTSSMozillaFirefoxbefore 153.5.0-118.16.2153.5.0-118.16.2
SUSE:Linux Enterprise Server 16.0MozillaFirefoxbefore 153.5.0-160000.1.1153.5.0-160000.1.1

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x…KEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the…KEV
    87Now
  • CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to…KEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-109706Oct 13, 2026 · Use-after-free in the Storage: IndexedDB component
    21Monitor
  • ← EarlierCVE-2026-109707Oct 13, 2026 · Sandbox escape due to use-after-free in the Networking component
    38Monitor
  • Later →CVE-2026-109709Oct 13, 2026 · Information disclosure, privilege escalation in the Security: Process Sandboxing component
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:firefox153.5.0-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:firefox153.5.0-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:firefox-x11153.5.0-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:thunderbird153.5.0-1.el9_8.alma.1 · AlmaLinux:9Package registry (OSV)
debian:firefox-esr153.5.0esr-1~deb12u1 · Debian:12Package registry (OSV)
debian:firefox-esr153.5.0esr-1~deb13u1 · Debian:13Package registry (OSV)
debian:thunderbird1:153.5.0esr-1 · Debian:14Package registry (OSV)
debian:thunderbird1:153.5.1esr-1~deb12u1 · Debian:12Package registry (OSV)
debian:thunderbird1:153.5.1esr-1~deb13u1 · Debian:13Package registry (OSV)
opensuse:firefox-esr153.5.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:MozillaFirefox158.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:MozillaThunderbird153.5.1-1.1 · openSUSE:TumbleweedPackage registry (OSV)
rocky linux:firefox0:153.5.0-1.el8_10 · Rocky Linux:8Package registry (OSV)
rocky linux:thunderbird0:153.5.0-1.el9_8 · Rocky Linux:9Package registry (OSV)
suse:MozillaFirefox153.5.0-118.16.2 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:MozillaFirefox153.5.0-160000.1.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:MozillaThunderbird153.5.0-150400.13.9.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recorded+2 d
  3. TodayNov 12, 2026+30 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-1636784 days apartSandbox escape due to invalid pointer in the Disability Access APIs component
    40Plan
  • CVE-2026-2776231 days apartSandbox escape due to incorrect boundary conditions in the Telemetry component in External Software
    40Plan
  • CVE-2026-2778231 days apartSandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component
    40Plan
  • CVE-2026-11786214 days apartPrivilege escalation due to incorrect boundary conditions in the Networking component
    39Monitor
  • CVE-2026-11794514 days apartIncorrect boundary conditions in the XML component
    39Monitor
  • CVE-2026-11794614 days apartIncorrect boundary conditions in the JavaScript Engine component
    39Monitor

Not on record for this CVE: patch commit or PR link · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. CVSS— → 9.6
  2. Severity— → critical
  3. SSVC exploitation— → none
  4. Fix✗ → ✓
  5. Exploit maturity— → none

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records