Is CVE-2026-3888 in the CISA KEV catalog?

No. CVE-2026-3888 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-3888?

CVE-2026-3888 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2026-3888?

CVE-2026-3888 has an EPSS score of 0.38% (31th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-3888?

Upgrade snapd on debian 12 to 2.57.6-1+deb12u1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2026-3888

HIGH

7.8

CVSS v3

NVD

Description

Local privilege escalation in snapd on Linux allows local attackers to get root privilege by re-creating snap's private /tmp directory when systemd-tmpfiles is configured to automatically clean up this directory. This issue affects Ubuntu 16.04 LTS, 18.04 LTS, 20.04 LTS, 22.04 LTS, and 24.04 LTS.

CWE-268

How to fix

Remediation Available

snapdDebian

Fixed in:2.57.6-1+deb12u1CVE-2026-3888

Fixed in:2.68.3-3+deb13u1CVE-2026-3888

Fixed in:2.76-1CVE-2026-3888

snapdUbuntu

Fixed in:2.61.4ubuntu0.16.04.1+esm2USN-8102-1

Fixed in:2.61.4ubuntu0.18.04.1+esm2USN-8102-1

Fixed in:2.67.1+20.04ubuntu1~esm1USN-8102-1

Fixed in:2.73+ubuntu22.04.1USN-8102-1

Fixed in:2.73+ubuntu24.04.2USN-8102-2

Fixed in:2.73+ubuntu24.04.1USN-8102-1

Fixed in:2.73+ubuntu25.10.1USN-8102-1

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 VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.38%probability of exploitation in 30 days

31stpercentile

Low risk: more likely to be exploited than 31% of all known CVEs.

References

Mitigation2

Third-Party Advisory4

Related Vulnerabilities

Other CWE-268 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-49741	High	7.4	3.4%	-	Fix
CVE-2019-3844	High	7.8	0.9%	-	Fix
CVE-2024-1250	Medium	6.5	0.5%	-	Fix
CVE-2024-1299	Medium	6.5	0.5%	-	Fix
CVE-2023-20194	Medium	4.9	0.5%	-	-
CVE-2022-1003	Low	3.3	0.5%	-	Fix

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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 2026-06-04.