Is CVE-2026-5704 in the CISA KEV catalog?

No. CVE-2026-5704 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-5704?

CVE-2026-5704 has a CVSS v3 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2026-5704?

CVE-2026-5704 has an EPSS score of 0.43% (35th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-5704?

Upgrade tar on ubuntu 14.04 to 1.27.1-1ubuntu0.1+esm5 or later.

CVE & CISA-KEV Catalog

CVE-2026-5704

MEDIUM

5.0

CVSS v3

NVD

Description

A flaw was found in tar. A remote attacker could exploit this vulnerability by crafting a malicious archive, leading to hidden file injection with fully attacker-controlled content. This bypasses pre-extraction inspection mechanisms, potentially allowing an attacker to introduce malicious files onto a system without detection.

CWE-434Unrestricted File Upload

How to fix

Remediation Available

tarUbuntu

Fixed in:1.27.1-1ubuntu0.1+esm5USN-8477-1

Fixed in:1.28-2.1ubuntu0.2+esm4USN-8477-1

Fixed in:1.29b-2ubuntu0.4+esm2USN-8477-1

Fixed in:1.30+dfsg-7ubuntu0.20.04.4+esm1USN-8477-1

Fixed in:1.34+dfsg-1ubuntu0.1.22.04.3USN-8477-1

Fixed in:1.35+dfsg-3ubuntu0.1USN-8477-1

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 ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.43%probability of exploitation in 30 days

35thpercentile

Low risk: more likely to be exploited than 35% of all known CVEs.

References

Exploit3

Third-Party Advisory2

Related Vulnerabilities

Other CWE-434 (Unrestricted File Upload) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-12617	High	8.1	100%	KEV	Fix
CVE-2018-15961	Critical	9.8	100%	KEV	-
CVE-2021-31207	Medium	6.6	100%	KEV + Ransom	Fix
CVE-2017-12615	High	8.1	100%	KEV + Ransom	-
CVE-2025-31324	Critical	10.0	99%	KEV + Ransom	-
CVE-2024-50623	Critical	9.8	99%	KEV + Ransom	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 2026-04-22.