CVE-2026-19023

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% (5th 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 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

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

Untrusted pointer dereference in the render_bin_output function in the h5dump tool in HDF5 before 2.3.0 allows attackers to cause a denial of service via a variable-length string dataset with more than one element dumped in binary mode, which corrupts the per-element stride calculation and causes subsequent elements to be read from a misaligned offset and dereferenced as a pointer.

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: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

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

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

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 (1)

Auto-updated Aug 6, 2026
No fix on record yet.
generic

h5dump: SIGSEGV in render_bin_output when dumping dataset with native binary output · Issue #6486 · HDFGroup/hdf5 · GitHub

https://github.com/HDFGroup/hdf5/issues/6486

Vendor Advisories for CVE-2026-19023(2)

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

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(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 67× 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 167 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-19023?
CVE-2026-19023 is a medium vulnerability published on August 5, 2026. Untrusted pointer dereference in the renderbinoutput function in the h5dump tool in HDF5 before 2.3.0 allows attackers to cause a denial of service via a variable-length string dataset with more than one element dumped in binary mode, which corrupts the per-element stride calculation and causes…
When was CVE-2026-19023 disclosed?
CVE-2026-19023 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-2026-19023 actively exploited?
CVE-2026-19023 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-19023?
CVE-2026-19023 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-2026-19023?
No fix for CVE-2026-19023 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-19023 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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