tar. A remote attacker
Affects tarSource GCVE Database
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
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 6 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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.
Patches and advisories
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTStarpkg:deb/ubuntu/tar?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 25.10tarpkg:deb/ubuntu/tar?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTStarpkg:deb/ubuntu/tar?arch=source&distro=nobleOther threats | Affected
| Fixed in
|
Ubuntu 22.04 LTStarpkg:deb/ubuntu/tar?arch=source&distro=jammyOther threats | Affected
| Fixed in
|
Ubuntu Pro 20.04 LTStarpkg:deb/ubuntu/tar?arch=source&distro=esm-infra/focalOther threats | Affected
| Fixed in
|
Ubuntu Pro 18.04 LTStarpkg:deb/ubuntu/tar?arch=source&distro=esm-infra/bionicOther threats | Affected
| Fixed in
|
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
- ubuntu.com/security/CVE-2026-5704 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-5704 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-5704 (opens in a new tab)
- ubuntu.com/security/notices/USN-8477-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8477-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8477-3 (opens in a new tab)