CVE-2026-66484

MEDIUMPre-NVD 4.64.6—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 95% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
4.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.6Exploit: None knownExposed: 0

A fix is available — apply it.

GNU cpio contains a Path Traversal vulnerability in its tar archive extraction functionality. When extracting a tar archive in copy-in mode with the --no-absolute-filenames option, the extracted file name is normalized but the tar hard-link target is passed to the link_to_name function without equivalent sanitization before calling link function. A tar archive provided by an attacker, containing a hard-link entry whose linkname is set to an absolute path outside the extraction directory, can cause cpio to create a hard link to an existing file outside the intended extraction directory, breaking the expected guarantee of --no-absolute-filenames and allowing archive-controlled linkage to external files.

This issue has been fixed in commit e2b9cbdd3354d2b1569b7390d1bc15c1930559ad

CVSS v3
4.6
EG Score
4.6(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity46% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

August 10, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated Aug 10, 2026
No patch confirmed yet.
generic

Vulnerabilities in GNU cpio software | CERT Polska

https://cert.pl/en/posts/2026/08/CVE-2026-66484

Vendor Advisories for CVE-2026-66484(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatcpio-main-2.15-10.1.hum12026-08-13redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 26× in last 7d / 34× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 08:13 UTCEG score recompute
  2. 2026-08-20 08:13 UTCVendor advisory
  3. 2026-08-20 08:13 UTCGHSA enrichment
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-19 06:01 UTCEG score recompute
  6. 2026-08-19 06:01 UTCVendor advisory
  7. 2026-08-19 06:01 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-18 03:44 UTCEG score recompute
  10. 2026-08-18 03:44 UTCVendor advisory
  11. 2026-08-18 03:44 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-17 01:33 UTCEG score recompute
  14. 2026-08-17 01:33 UTCVendor advisory
  15. 2026-08-17 01:33 UTCGHSA enrichment
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-15 23:22 UTCEG score recompute
  18. 2026-08-15 23:22 UTCVendor advisory
  19. 2026-08-15 23:22 UTCGHSA enrichment
  20. 2026-08-15 01:30 UTCEPSS rescore
  21. 2026-08-14 21:10 UTCEG score recompute
  22. 2026-08-14 21:10 UTCVendor advisory
  23. 2026-08-14 21:10 UTCGHSA enrichment
  24. 2026-08-13 22:00 UTCEPSS rescore
  25. 2026-08-13 18:58 UTCVendor advisory
Show 9 more
  1. 2026-08-13 18:58 UTCGHSA enrichment
  2. 2026-08-12 16:46 UTCEG score recompute
  3. 2026-08-12 16:46 UTCGHSA enrichment
  4. 2026-08-12 13:51 UTCEPSS rescore
  5. 2026-08-11 14:35 UTCEG score recompute
  6. 2026-08-11 14:35 UTCGHSA enrichment
  7. 2026-08-10 11:20 UTCEG score recompute
  8. 2026-08-10 10:31 UTCEG score recompute
  9. 2026-08-10 10:31 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-66484?
CVE-2026-66484 is a medium vulnerability published on August 10, 2026. GNU cpio contains a Path Traversal vulnerability in its tar archive extraction functionality. When extracting a tar archive in copy-in mode with the --no-absolute-filenames option, the extracted file name is normalized but the tar hard-link target is passed to the linktoname function without…
When was CVE-2026-66484 disclosed?
CVE-2026-66484 was first published in the National Vulnerability Database on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66484 actively exploited?
CVE-2026-66484 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 94.6% of all scored CVEs.
What is the CVSS score of CVE-2026-66484?
CVE-2026-66484 has a CVSS v3 base score of 4.6 (NVD).
How do I remediate CVE-2026-66484?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66484, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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