CVE-2026-66485

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% (7th percentile of EPSS-scored CVEs). 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: 0.2%CVSS: 4.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c. The function uses alloca to allocate stack memory based on the length of argpath, which is derived from an archive-controlled pathname during extraction. A malicious cpio archive containing a sufficiently long nested pathname causes an unbounded stack allocation, resulting in a stack overflow and crash of the cpio process. An attacker who can supply a crafted cpio archive to a victim who extracts it can cause a denial of service.

This issue has been fixed in commit 3cd514031371d8aeeaf2048aa10103e02831aaa9

CVSS v3
4.6
EG Score
4.6MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.2%
EPSS %ILE
7th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 10, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 10, 2026
Patch available.
generic

Vulnerabilities in GNU cpio software | CERT Polska

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

Vendor Advisories for CVE-2026-66485(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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntucpio-win32 (2.12+dfsg-6ubuntu0.18.04.4+esm1) @ bionic2026-10-05ubuntu

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 rangeFix by version rangeDependents
cpio2.13+dfsg-7.1, 2.14+dfsg-1, 2.15+dfsg-1, 2.15+dfsg-2, 2.15+dfsg-2.1
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
cpio2.15+dfsg-2, 2.15+dfsg-2.1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
cpio2.15+dfsg-2, 2.15+dfsg-2.1
  • every version on: no fix on record
—

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 / 83× 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 154 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

Same vendor

2 shown

ubuntu:USN-8704-1

Frequently asked(5)

What is CVE-2026-66485?
CVE-2026-66485 is a medium vulnerability published on August 10, 2026. GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c. The function uses alloca to allocate stack memory based on the length of argpath, which is derived from an archive-controlled pathname during extraction. A malicious cpio archive containing a…
When was CVE-2026-66485 disclosed?
CVE-2026-66485 was first published 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-2026-66485 actively exploited?
CVE-2026-66485 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (7th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66485?
CVE-2026-66485 has a CVSS base score of 4.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-66485?
A fix for CVE-2026-66485 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-66485 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-66485

Explore →

Is Your Infrastructure Affected by CVE-2026-66485?

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

Book a Demo →Browse All CVEs