CVE-2026-66486

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: 0.1%, top 97% 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 is vulnerable to improper encoding or escaping of output in its archive member listing functionality. When listing archive members via cpio -it, member names are printed directly to output without quoting or escaping. An attacker can craft a cpio archive containing member names with embedded newline characters or ANSI escape sequences, causing forged listing entries or terminal control sequence injection when the listing is displayed.

This issue has been fixed in commit 2ff9600c9ef32e88759843cdbde74c8db5ae9b30

CVSS v3
4.6
EG Score
4.6(medium)
EG Risk
21(Track)
EG Risk 21/100SSVC: 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%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

August 10, 2026

Last Modified

August 28, 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-2026-66486(2)

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
ubuntucpio (2.15+dfsg-2.1ubuntu0.1) @ resolute2026-09-19ubuntu

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.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
cpio2.13+dfsg-7.1, 2.14+dfsg-1, 2.15+dfsg-1, 2.15+dfsg-2, 2.15+dfsg-2.1——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
cpio2.15+dfsg-2, 2.15+dfsg-2.1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
cpio2.15+dfsg-2, 2.15+dfsg-2.1——

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 21× in last 7d / 89× 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.

Showing the most recent 100 of 117 total refreshes for this CVE.

  1. 2026-09-19 02:53 UTCEG score recompute
  2. 2026-09-19 02:53 UTCVendor advisory
  3. 2026-09-19 02:53 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 01:51 UTCEG score recompute
  6. 2026-09-18 01:51 UTCVendor advisory
  7. 2026-09-18 01:51 UTCGHSA enrichment
  8. 2026-09-17 00:50 UTCEG score recompute
  9. 2026-09-17 00:50 UTCVendor advisory
  10. 2026-09-17 00:50 UTCGHSA enrichment
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 14:07 UTCEG score recompute
  14. 2026-09-15 14:07 UTCVendor advisory
  15. 2026-09-15 14:07 UTCGHSA enrichment
  16. 2026-09-14 11:05 UTCEG score recompute
  17. 2026-09-14 11:05 UTCVendor advisory
  18. 2026-09-14 11:05 UTCGHSA enrichment
  19. 2026-09-13 10:04 UTCEG score recompute
  20. 2026-09-13 10:04 UTCVendor advisory
  21. 2026-09-13 10:04 UTCGHSA enrichment
  22. 2026-09-12 09:00 UTCEG score recompute
  23. 2026-09-12 09:00 UTCVendor advisory
  24. 2026-09-12 09:00 UTCGHSA enrichment
  25. 2026-09-11 14:53 UTCEPSS rescore
Show 75 more
  1. 2026-09-11 09:37 UTCEPSS rescore
  2. 2026-09-11 07:58 UTCEG score recompute
  3. 2026-09-11 07:58 UTCVendor advisory
  4. 2026-09-11 07:58 UTCGHSA enrichment
  5. 2026-09-10 06:57 UTCVendor advisory
  6. 2026-09-10 06:57 UTCGHSA enrichment
  7. 2026-09-09 05:55 UTCEG score recompute
  8. 2026-09-09 05:55 UTCVendor advisory
  9. 2026-09-09 05:55 UTCGHSA enrichment
  10. 2026-09-08 22:01 UTCEPSS rescore
  11. 2026-09-07 17:30 UTCEG score recompute
  12. 2026-09-07 17:30 UTCVendor advisory
  13. 2026-09-07 17:30 UTCGHSA enrichment
  14. 2026-09-07 16:01 UTCEPSS rescore
  15. 2026-09-06 13:47 UTCEPSS rescore
  16. 2026-09-06 10:31 UTCEG score recompute
  17. 2026-09-06 10:31 UTCVendor advisory
  18. 2026-09-06 10:31 UTCGHSA enrichment
  19. 2026-09-05 15:31 UTCEPSS rescore
  20. 2026-09-05 09:30 UTCEG score recompute
  21. 2026-09-05 09:30 UTCVendor advisory
  22. 2026-09-05 09:30 UTCGHSA enrichment
  23. 2026-09-04 08:29 UTCEG score recompute
  24. 2026-09-04 08:29 UTCVendor advisory
  25. 2026-09-04 08:29 UTCGHSA enrichment
  26. 2026-09-04 05:07 UTCEPSS rescore
  27. 2026-09-03 03:51 UTCEG score recompute
  28. 2026-09-03 03:51 UTCVendor advisory
  29. 2026-09-03 03:51 UTCGHSA enrichment
  30. 2026-09-02 14:12 UTCEPSS rescore
  31. 2026-09-02 00:01 UTCEG score recompute
  32. 2026-09-02 00:01 UTCVendor advisory
  33. 2026-09-02 00:01 UTCGHSA enrichment
  34. 2026-09-01 13:54 UTCEPSS rescore
  35. 2026-09-01 04:40 UTCEPSS rescore
  36. 2026-08-31 22:59 UTCVendor advisory
  37. 2026-08-31 22:59 UTCGHSA enrichment
  38. 2026-08-30 21:58 UTCEG score recompute
  39. 2026-08-30 21:58 UTCGHSA enrichment
  40. 2026-08-30 19:17 UTCEPSS rescore
  41. 2026-08-30 01:22 UTCEPSS rescore
  42. 2026-08-29 20:56 UTCEG score recompute
  43. 2026-08-29 20:56 UTCGHSA enrichment
  44. 2026-08-28 21:42 UTCEPSS rescore
  45. 2026-08-28 15:57 UTCGHSA enrichment
  46. 2026-08-28 05:57 UTCEG score recompute
  47. 2026-08-28 05:57 UTCGHSA enrichment
  48. 2026-08-27 04:41 UTCEG score recompute
  49. 2026-08-27 04:41 UTCGHSA enrichment
  50. 2026-08-26 14:47 UTCEPSS rescore
  51. 2026-08-26 03:38 UTCEG score recompute
  52. 2026-08-26 03:37 UTCGHSA enrichment
  53. 2026-08-25 13:49 UTCEPSS rescore
  54. 2026-08-25 02:35 UTCEG score recompute
  55. 2026-08-25 02:35 UTCGHSA enrichment
  56. 2026-08-24 01:32 UTCGHSA enrichment
  57. 2026-08-23 00:30 UTCEG score recompute
  58. 2026-08-23 00:30 UTCGHSA enrichment
  59. 2026-08-23 00:19 UTCEPSS rescore
  60. 2026-08-21 23:49 UTCEPSS rescore
  61. 2026-08-21 23:29 UTCEG score recompute
  62. 2026-08-21 23:29 UTCGHSA enrichment
  63. 2026-08-20 22:56 UTCEPSS rescore
  64. 2026-08-20 22:28 UTCGHSA enrichment
  65. 2026-08-19 21:27 UTCEG score recompute
  66. 2026-08-19 21:27 UTCGHSA enrichment
  67. 2026-08-19 17:04 UTCEPSS rescore
  68. 2026-08-18 20:25 UTCEG score recompute
  69. 2026-08-18 20:25 UTCGHSA enrichment
  70. 2026-08-18 13:48 UTCEPSS rescore
  71. 2026-08-17 19:23 UTCEG score recompute
  72. 2026-08-17 19:23 UTCGHSA enrichment
  73. 2026-08-17 13:47 UTCEPSS rescore
  74. 2026-08-16 17:39 UTCEG score recompute
  75. 2026-08-16 17:39 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-66486?
CVE-2026-66486 is a medium vulnerability published on August 10, 2026. GNU cpio is vulnerable to improper encoding or escaping of output in its archive member listing functionality. When listing archive members via cpio -it, member names are printed directly to output without quoting or escaping. An attacker can craft a cpio archive containing member names with…
When was CVE-2026-66486 disclosed?
CVE-2026-66486 was first published in the National Vulnerability Database on August 10, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66486 actively exploited?
CVE-2026-66486 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 96.5% of all scored CVEs.
What is the CVSS score of CVE-2026-66486?
CVE-2026-66486 has a CVSS v3 base score of 4.6 (NVD).
How do I remediate CVE-2026-66486?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66486, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-66486

Explore →

Is Your Infrastructure Affected by CVE-2026-66486?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs