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

CVE-2026-109722: JIT miscompilation in the JavaScript Engine: JIT component

HighCVSS 8.1 · v3.1—Proof of concept Fix available

Noroxi assessment

Priority: Monitor (action score 32/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.31% (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

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

Published
Oct 13, 2026
Updated
Oct 16, 2026
EPSS
0.3% · 24th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.1 / 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
  • Proof of concept exists, no weaponized module
  • A fix has been released

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

Follow CVE-2026-109722

When you'll hear from us

  • when it enters CISA KEV
  • 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?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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

    • 115.43 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-2026-109720Oct 13, 2026 · JIT miscompilation in the JavaScript: WebAssembly component
    28Monitor
  • ← EarlierCVE-2026-109721Oct 13, 2026 · Incorrect boundary conditions in the JavaScript Engine: JIT component
    21Monitor
  • Later →CVE-2026-109723Oct 13, 2026 · Integer overflow in the Layout: Text and Fonts component
    21Monitor

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

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02026-10-29

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. First PoC+15 d
  4. TodayNov 13, 2026+31 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-2026-1639284 days apartJIT miscompilation in the JavaScript Engine: JIT component
    36Monitor
  • CVE-2026-12321119 days apartJIT miscompilation in the JavaScript: WebAssembly component
    21Monitor

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

Weakness class (CWE)

CWE-670 · Always-Incorrect Control Flow Implementation

CVSS vector

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

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.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturitynone → poc
  2. CVSS— → 8.1
  3. Severity— → high
  4. SSVC exploitation— → none
  5. Fix✗ → ✓
  6. 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