CVE-2026-56392

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 96% 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, nvd
Trending — Patch released this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: None knownExposed: 0

A fix is available — apply it.

GNU coreutils unexpand is vulnerable to a heap-based buffer overflow due to an integer overflow during buffer allocation when processing large tab stop (-t) values. The multiplication used to calculate the allocation size can wrap around, resulting in an undersized buffer. When processing crafted input, subsequent writes exceed the allocated memory, leading to an out‑of‑bounds heap write.

When running GNU coreutils unexpand with attacker-provided large tab stop (-t) arguments, this behavior leads to a crash and potentially achieve a heap write primitive depending on memory layout.

This issue has been fixed in the commit b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

July 24, 2026

Last Modified

August 26, 2026

Advisory Details (2)

Auto-updated Aug 26, 2026
No patch confirmed yet.
generic

unexpand: fix heap overflow - coreutils.git - GNU coreutils

https://git.savannah.gnu.org/cgit/coreutils.git/commit/?id=b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d
generic

Vulnerabilities in GNU coreutils software | CERT Polska

https://cert.pl/en/posts/2026/07/CVE-2026-56391

Vendor Advisories for CVE-2026-56392(4)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatcoreutils-0:9.5-8.el10_2.12026-09-16redhat
redhatcoreutils-0:8.32-41.el9_8.12026-09-10redhat
redhatcoreutils-0:8.30-20.el8_102026-07-29redhat
redhatcoreutils-main-9.11-5.hum12026-07-16redhat

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
coreutils8.32-4 ... 9.7-3 (14 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
coreutils9.1-1 ... 9.7-3 (12 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
coreutils9.10-1, 9.7-3——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
coreutils9.10-1, 9.7-3——

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

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 24× in last 7d / 85× 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 137 total refreshes for this CVE.

  1. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-20 01:44 UTCEG score recompute
  3. 2026-09-20 01:44 UTCVendor advisory
  4. 2026-09-20 01:44 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 07:49 UTCEG score recompute
  7. 2026-09-18 07:49 UTCVendor advisory
  8. 2026-09-18 07:49 UTCGHSA enrichment
  9. 2026-09-17 19:31 UTCEPSS rescore
  10. 2026-09-17 09:54 UTCEG score recompute
  11. 2026-09-17 09:54 UTCVendor advisory
  12. 2026-09-17 09:54 UTCGHSA enrichment
  13. 2026-09-16 14:08 UTCEPSS rescore
  14. 2026-09-16 11:59 UTCEG score recompute
  15. 2026-09-16 11:59 UTCVendor advisory
  16. 2026-09-16 11:59 UTCGHSA enrichment
  17. 2026-09-16 05:15 UTCEPSS rescore
  18. 2026-09-15 09:42 UTCEG score recompute
  19. 2026-09-15 09:42 UTCVendor advisory
  20. 2026-09-15 09:42 UTCGHSA enrichment
  21. 2026-09-15 03:11 UTCEPSS rescore
  22. 2026-09-14 10:25 UTCEG score recompute
  23. 2026-09-14 10:25 UTCVendor advisory
  24. 2026-09-14 10:25 UTCGHSA enrichment
  25. 2026-09-13 16:47 UTCEPSS rescore
Show 75 more
  1. 2026-09-13 12:30 UTCVendor advisory
  2. 2026-09-13 12:30 UTCGHSA enrichment
  3. 2026-09-12 14:35 UTCVendor advisory
  4. 2026-09-12 14:35 UTCGHSA enrichment
  5. 2026-09-11 16:40 UTCEG score recompute
  6. 2026-09-11 16:40 UTCVendor advisory
  7. 2026-09-11 16:40 UTCGHSA enrichment
  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-10 14:54 UTCEG score recompute
  10. 2026-09-10 14:54 UTCVendor advisory
  11. 2026-09-10 14:54 UTCGHSA enrichment
  12. 2026-09-10 09:35 UTCEPSS rescore
  13. 2026-09-09 08:51 UTCVendor advisory
  14. 2026-09-09 08:51 UTCGHSA enrichment
  15. 2026-09-07 21:27 UTCEG score recompute
  16. 2026-09-07 21:27 UTCVendor advisory
  17. 2026-09-07 21:27 UTCGHSA enrichment
  18. 2026-09-07 16:01 UTCEPSS rescore
  19. 2026-09-06 17:25 UTCEG score recompute
  20. 2026-09-06 17:25 UTCVendor advisory
  21. 2026-09-06 17:25 UTCGHSA enrichment
  22. 2026-09-06 13:47 UTCEPSS rescore
  23. 2026-09-05 19:26 UTCEG score recompute
  24. 2026-09-05 19:26 UTCVendor advisory
  25. 2026-09-05 19:26 UTCGHSA enrichment
  26. 2026-09-04 12:56 UTCEG score recompute
  27. 2026-09-04 12:56 UTCVendor advisory
  28. 2026-09-04 12:56 UTCGHSA enrichment
  29. 2026-09-04 05:07 UTCEPSS rescore
  30. 2026-09-02 14:12 UTCEPSS rescore
  31. 2026-09-01 23:19 UTCEG score recompute
  32. 2026-09-01 23:19 UTCVendor advisory
  33. 2026-09-01 23:19 UTCGHSA enrichment
  34. 2026-09-01 13:54 UTCEPSS rescore
  35. 2026-09-01 04:40 UTCEPSS rescore
  36. 2026-08-30 22:17 UTCEG score recompute
  37. 2026-08-30 22:17 UTCVendor advisory
  38. 2026-08-30 22:17 UTCGHSA enrichment
  39. 2026-08-30 19:17 UTCEPSS rescore
  40. 2026-08-30 01:22 UTCEPSS rescore
  41. 2026-08-30 00:21 UTCEG score recompute
  42. 2026-08-30 00:21 UTCVendor advisory
  43. 2026-08-30 00:21 UTCGHSA enrichment
  44. 2026-08-28 21:42 UTCEPSS rescore
  45. 2026-08-27 14:25 UTCEPSS rescore
  46. 2026-08-27 14:15 UTCVendor advisory
  47. 2026-08-27 14:15 UTCGHSA enrichment
  48. 2026-08-26 16:20 UTCEG score recompute▲ 4.30
  49. 2026-08-26 16:20 UTCVendor advisory
  50. 2026-08-26 16:20 UTCGHSA enrichment
  51. 2026-08-26 16:17 UTCNVD updateCVSS v3 → 6.1 · severity → MEDIUM
  52. 2026-08-26 14:46 UTCEPSS rescore
  53. 2026-08-25 20:09 UTCEG score recompute
  54. 2026-08-25 20:09 UTCVendor advisory
  55. 2026-08-25 20:09 UTCGHSA enrichment
  56. 2026-08-25 13:49 UTCEPSS rescore
  57. 2026-08-23 00:19 UTCEPSS rescore
  58. 2026-08-22 13:42 UTCEG score recompute
  59. 2026-08-22 13:42 UTCVendor advisory
  60. 2026-08-22 13:42 UTCGHSA enrichment
  61. 2026-08-21 23:49 UTCEPSS rescore
  62. 2026-08-20 22:55 UTCEPSS rescore
  63. 2026-08-19 17:04 UTCEPSS rescore
  64. 2026-08-19 07:17 UTCEG score recompute
  65. 2026-08-19 07:17 UTCVendor advisory
  66. 2026-08-19 07:17 UTCGHSA enrichment
  67. 2026-08-18 13:48 UTCEPSS rescore
  68. 2026-08-17 13:47 UTCEPSS rescore
  69. 2026-08-16 14:56 UTCEPSS rescore
  70. 2026-08-16 02:14 UTCEPSS rescore
  71. 2026-08-16 00:49 UTCEG score recompute
  72. 2026-08-16 00:49 UTCVendor advisory
  73. 2026-08-16 00:49 UTCGHSA enrichment
  74. 2026-08-15 01:30 UTCEPSS rescore
  75. 2026-08-13 22:00 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Same vendor

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redhat:RHSA-2026:67886

Frequently asked(5)

What is CVE-2026-56392?
CVE-2026-56392 is a medium vulnerability published on July 24, 2026. GNU coreutils unexpand is vulnerable to a heap-based buffer overflow due to an integer overflow during buffer allocation when processing large tab stop (-t) values. The multiplication used to calculate the allocation size can wrap around, resulting in an undersized buffer. When processing crafted…
When was CVE-2026-56392 disclosed?
CVE-2026-56392 was first published in the National Vulnerability Database on July 24, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56392 actively exploited?
CVE-2026-56392 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 95.8% of all scored CVEs.
What is the CVSS score of CVE-2026-56392?
CVE-2026-56392 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-56392?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56392, 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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