USN-8477-3: tar regression

unknownCVE-2026-5704

USN-8477-1 fixed a vulnerability in tar. That fix was incomplete and could cause tar to fail to extract old archives that recorded a nonzero size for directory entries, resulting in a regression. This update fixes the problem. We apologize for the inconvenience. Original advisory details: It was discovered that tar incorrectly handled certain crafted archive files. An attacker could possibly use this to inject hidden files with attacker-controlled content, bypassing pre-extraction inspection mechanisms.

CSIRTS triage

product: tarOther

What: The fix for a previous vulnerability in tar was incomplete, causing a regression.
Who is affected: Users of the tar utility.
Urgency: Remediation is necessary to restore functionality and security.
Action: Apply the latest update for tar.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Ubuntu Security Notices (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-07-22
Exploitation: Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8477-3

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-57040.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-5704	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[UPDATE] [medium] GNU tar: Vulnerability allows bypassing of security measurescert-bund
unknownUSN-8477-2: tar regressionubuntu