CVE-2026-19026

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (6th 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 — Patch released this weekElevated
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

H5Z__filter_nbit in H5Znbit.c in HDF5 through 2.3.0 dereferences cd_values[0] through cd_values[4] without validating that cd_values is non-NULL or that cd_nelmts is at least 5, the fixed size of the filter's header. This allows attackers to cause a denial of service via a crafted HDF5 file that stores the N-Bit filter pipeline message with zero client-data values, opened and read via H5Dread, e.g. by the h5ls or h5repack tools.

CVSS v3
6.8
EG Score
6.8MEDIUMmedium confidence
EG Risk
47
EG Risk 47/100CISA 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
Severity68% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). 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 5, 2026

Last Modified

August 31, 2026

Advisory Details (3)

Auto-updated Aug 5, 2026
Patch available. Sources: github_pr.
generic

h5repack: SIGSEGV in Nbit filter processing when repacking datasets · Issue #6492 · HDFGroup/hdf5 · GitHub

https://github.com/HDFGroup/hdf5/issues/6492
generic

h5ls: SIGSEGV in Nbit filter processing when dumping datasets · Issue #6489 · HDFGroup/hdf5 · GitHub

https://github.com/HDFGroup/hdf5/issues/6489
github_pr

Fix h5ls SIGSEGVs in Nbit and Fletcher32 filter decode paths

Upstream fix in progress (PR #6497 · HDFGroup/hdf5, state=open)

https://github.com/HDFGroup/hdf5/pull/6497

Vendor Advisories for CVE-2026-19026(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
redhathdf5-main-2.2.0-0.1.2.hum12026-09-29redhat

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 rangeFix by version rangeDependents
hdf51.10.10+repack-1 ... 2.1.0+repack-1~exp9 (83 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
hdf51.10.10+repack-1 ... 2.2.0+repack-5 (77 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
hdf51.14.5+repack-3 ... 2.2.0+repack-5 (46 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
hdf51.14.5+repack-3 ... 2.2.0+repack-5 (46 versions)
  • every version on: no fix on record
—

Weakness Classification(2)

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 15× in last 7d / 75× 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 159 total refreshes for this CVE.

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

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redhat:RHSA-2026:73539

Frequently asked(5)

What is CVE-2026-19026?
CVE-2026-19026 is a medium vulnerability published on August 5, 2026. H5Zfilternbit in H5Znbit.c in HDF5 through 2.3.0 dereferences cdvalues[0] through cdvalues[4] without validating that cdvalues is non-NULL or that cd_nelmts is at least 5, the fixed size of the filter's header. This allows attackers to cause a denial of service via a crafted HDF5 file that stores…
When was CVE-2026-19026 disclosed?
CVE-2026-19026 was first published on August 5, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19026 actively exploited?
CVE-2026-19026 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-19026?
CVE-2026-19026 has a CVSS base score of 6.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-19026?
A fix for CVE-2026-19026 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-19026 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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