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CVE-2026-5704VulnerabilityPublished Updated

tar. A remote attacker

Affects tarSource GCVE Database

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Authoritative record:CVE-2026-5704· Medium 5.0

Not known to be exploited · CVSS 5.0 Medium · fixed in 1.27.1-1ubuntu0.1+esm7 : update tar when convenient.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
5.0Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 37% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.27.1-1ubuntu0.1+esm7, 1.28-2.1ubuntu0.2+esm6, 1.29b-2ubuntu0.4+esm4 +4
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Ubuntu 26.04 LTStarpkg:deb/ubuntu/tar?arch=source&distro=resoluteOther threatsAffected
  • <1.35+dfsg-4ubuntu0.4
Fixed in
  • 1.35+dfsg-4ubuntu0.4
Ubuntu 25.10tarpkg:deb/ubuntu/tar?arch=source&distro=questingOther threatsAffected
  • =1.35+dfsg-3.1
  • =1.35+dfsg-3.1build1
Fixed in–
Ubuntu 24.04 LTStarpkg:deb/ubuntu/tar?arch=source&distro=nobleOther threatsAffected
  • <1.35+dfsg-3ubuntu0.4
Fixed in
  • 1.35+dfsg-3ubuntu0.4
Ubuntu 22.04 LTStarpkg:deb/ubuntu/tar?arch=source&distro=jammyOther threatsAffected
  • <1.34+dfsg-1ubuntu0.1.22.04.6
Fixed in
  • 1.34+dfsg-1ubuntu0.1.22.04.6
Ubuntu Pro 20.04 LTStarpkg:deb/ubuntu/tar?arch=source&distro=esm-infra/focalOther threatsAffected
  • <1.30+dfsg-7ubuntu0.20.04.4+esm3
Fixed in
  • 1.30+dfsg-7ubuntu0.20.04.4+esm3
Ubuntu Pro 18.04 LTStarpkg:deb/ubuntu/tar?arch=source&distro=esm-infra/bionicOther threatsAffected
  • <1.29b-2ubuntu0.4+esm4
Fixed in
  • 1.29b-2ubuntu0.4+esm4

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

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.

References

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