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

CVE-2026-109765: Race condition, use-after-free in the Graphics: Text component

Noroxi assessment

Priority: Monitor (action score 16/100)

  • 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: 0.17% (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. Special conditions such as timing or configuration are required.
  • Fixed version: firefox-esr (Debian:12) 153.5.0esr-1~deb12u1; thunderbird (Debian:12) 1:153.5.1esr-1~deb12u1; firefox-esr (Debian:13) 153.5.0esr-1~deb13u1.

Low priority for now. Upgrade to firefox-esr (Debian:12) 153.5.0esr-1~deb12u1; thunderbird (Debian:12) 1:153.5.1esr-1~deb12u1; firefox-esr (Debian:13) 153.5.0esr-1~deb13u1 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

Race condition, use-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

MediumCVSS 4.2 · v3.1—No exploit Fix available
Published
Oct 13, 2026
Updated
Oct 13, 2026
EPSS
0.1% · 6th percentile

Report tools

JSON

Action score

16

Monitor

Low priority for now.

CVSS
16 / 40 · 4.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

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-2026-109765

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

    • 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
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

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 befKEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxeKEV
    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 bypassKEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-109763Oct 13, 2026 · Mitigation bypass in the File Handling component
    21Monitor
  • ← EarlierCVE-2026-109764Oct 13, 2026 · Mitigation bypass in the Enterprise Policies component
    21Monitor
  • Later →CVE-2026-109766Oct 13, 2026 · Mitigation bypass in the Enterprise Policies component
    32Monitor

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
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)

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 9, 2026+27 d
EPSS, last 120 days

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

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

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-2026-9205028 days apartSandbox escape due to race condition in the XPConnect component
    36Monitor
  • CVE-2026-11797014 days apartRace condition in the Disability Access APIs component
    35Monitor
  • CVE-2026-11799914 days apartRace condition in the IPC component
    35Monitor
  • CVE-2026-11801914 days apartRace condition, use-after-free in the DOM: File component
    35Monitor
  • CVE-2026-1097570 days apartSandbox escape due to race condition in the Networking component
    33Monitor
  • CVE-2026-10080514 days apartRace condition, use-after-free in the Audio/Video component
    30Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

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.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSS vector

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

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓
  2. CVSS— → 4.2
  3. Severity— → medium
  4. SSVC exploitation— → none
  5. Exploit maturity— → none

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

References

Show all references (4 more)

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

All records