CVE-2022-26386

Q: How do I fix CVE-2022-26386?

Published advisories record a fix for 6 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Q: Is CVE-2022-26386 being actively exploited?

Not that we know of. CVE-2022-26386 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.68% is the estimated probability that it will be exploited in the next 30 days. That is higher than 51% of all scored CVEs.

Q: How severe is CVE-2022-26386?

CVE-2022-26386 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2022-26386 affect?

Published advisories record a fix for thunderbird (Amazon), thunderbird-debuginfo (Amazon), firefox-esr (Debian), thunderbird (Ubuntu), and 2 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

6.5

CVSS v3

NVD

Description

Previously Firefox for macOS and Linux would download temporary files to a user-specific directory in /tmp , but this behavior was changed to download them to /tmp where they could be affected by other local users. This behavior was reverted to the original, user-specific directory. *This bug only affects Firefox for macOS and Linux. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 91.7 and Thunderbird < 91.7.

CWE-377

How to fix

Remediation Available

thunderbirdAmazon

Fixed in:0:91.7.0-2.amzn2.0.1

thunderbird-debuginfoAmazon

Fixed in:0:91.7.0-2.amzn2.0.1

firefox-esrDebian

Fixed in:91.7.0esr-1CVE-2022-26386

thunderbirdUbuntu

Fixed in:1:91.7.0+build2-0ubuntu0.18.04.1USN-5345-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:1:91.7.0+build2-0ubuntu0.20.04.1USN-5345-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Mozilla Firefox ESR (en-US)Windows application

Affected:91.7Fixed in:91.7Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:91.7Fixed in:91.7Mozilla

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.68%probability of exploitation in 30 days

51stpercentile

Moderate risk: more likely to be exploited than 51% of all known CVEs.

References

Exploit1

bugzilla.mozilla.org

Vendor Advisory2

Related Vulnerabilities

Other CWE-377 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-5224	Critical	9.8	4.5%	-	Fix
CVE-2026-20204	High	7.1	3.1%	-	Fix
CVE-2018-3710	High	7.8	2.8%	-	Fix
CVE-2017-16024	Medium	6.5	2.6%	-	Fix
CVE-2012-2666	Critical	9.8	1.9%	-	-
CVE-2018-16494	High	8.8	1.9%	-	Fix

Common questions

How do I fix CVE-2022-26386?

Published advisories record a fix for 6 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2022-26386 being actively exploited?

Not that we know of. CVE-2022-26386 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.68% is the estimated probability that it will be exploited in the next 30 days. That is higher than 51% of all scored CVEs.

How severe is CVE-2022-26386?

CVE-2022-26386 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2022-26386 affect?

Published advisories record a fix for thunderbird (Amazon), thunderbird-debuginfo (Amazon), firefox-esr (Debian), thunderbird (Ubuntu), and 2 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2022-26386

Markdown

[![CVE-2022-26386](https://tridentstack.com/cve/badge/CVE-2022-26386.svg)](https://tridentstack.com/cve/CVE-2022-26386)

HTML

<a href="https://tridentstack.com/cve/CVE-2022-26386"><img src="https://tridentstack.com/cve/badge/CVE-2022-26386.svg" alt="CVE-2022-26386"></a>

Check your Linux endpoints for this class of vulnerability

TridentStack Control continuously scans Linux endpoints for known vulnerabilities and deploys the fixes from the same console. 200 endpoints free forever, no credit card.

Patch your fleet free Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.