CVE-2026-26197

HIGHNVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4% (28th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If a file is corrupted such that an array datatype's size, the number of elements, and the element size are not in agreement it can trigger an out of bounds read. The array datatype stores the full size of the datatype (dt->shared->size) separately from the number of elements (dt->shared->u.array.nelem) and the element size (dt->shared->parent->shared->size). If any one of these are corrupted so that they don't align with the others (element size * nelem = full size), it can lead to an out of bounds read. Depending on what is corrupted, it can alter the type of out of bounds read triggered. The vulnerability is present only in files that have been maliciously altered, as its generally not possible to independently alter the full size of the datatype, the element count and the element size. As such, this is only present if a malicious actor is altering files, and won't appear in regular usage.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
50
EG Risk 50/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
28th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 20, 2026

Last Modified

July 29, 2026

Advisory Details (1)

Auto-updated Jul 25, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

Array full size, element count, and element size are not checked to make sure they match in H5Odtype.c · Advisory · HDFGroup/hdf5 · GitHub

https://github.com/HDFGroup/hdf5/security/advisories/GHSA-gh44-7wpq-622f

Vendor Advisories for CVE-2026-26197(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-2.2.0-0.1.1.hum12026-08-31redhat

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 ... 2.1.0+repack-1~exp9 (40 versions)
  • every version up to 2.1.0+repack-1: fixed in 2.1.0+repack-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 41× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 186 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 89 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  2. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  3. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  4. 2026-10-12 16:18 UTCEG score recompute
  5. 2026-10-11 20:00 UTCEG score recompute
  6. 2026-10-11 17:14 UTCEG score recompute
  7. 2026-10-11 14:45 UTCEG score recompute
  8. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  11. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  12. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  13. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  14. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  15. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  16. 2026-10-04 14:56 UTCEG score recompute
  17. 2026-10-04 14:56 UTCVendor advisory
  18. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  19. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  20. 2026-10-01 07:45 UTCEG score recompute
  21. 2026-10-01 07:45 UTCVendor advisory
  22. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  23. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  24. 2026-09-28 06:23 UTCEG score recompute
  25. 2026-09-28 06:23 UTCVendor advisory
Show 72 more
  1. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  2. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  3. 2026-09-24 03:29 UTCEG score recompute
  4. 2026-09-24 03:29 UTCVendor advisory
  5. 2026-09-23 01:43 UTCEG score recompute
  6. 2026-09-23 01:43 UTCVendor advisory
  7. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  8. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  9. 2026-09-18 03:58 UTCEG score recompute
  10. 2026-09-18 03:58 UTCVendor advisory
  11. 2026-09-17 05:15 UTCEG score recompute
  12. 2026-09-17 05:15 UTCVendor advisory
  13. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  14. 2026-09-16 12:48 UTCEG score recompute
  15. 2026-09-16 12:48 UTCVendor advisory
  16. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  17. 2026-09-14 04:32 UTCEG score recompute
  18. 2026-09-14 04:32 UTCVendor advisory
  19. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  20. 2026-09-13 16:01 UTCVendor advisory
  21. 2026-09-13 03:19 UTCEG score recompute
  22. 2026-09-13 03:19 UTCVendor advisory
  23. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  24. 2026-09-12 13:35 UTCVendor advisory
  25. 2026-09-12 01:05 UTCEG score recompute
  26. 2026-09-12 01:05 UTCVendor advisory
  27. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  28. 2026-09-11 09:29 UTCEG score recompute
  29. 2026-09-11 09:29 UTCVendor advisory
  30. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  31. 2026-09-09 11:57 UTCEG score recompute
  32. 2026-09-09 11:57 UTCVendor advisory
  33. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  34. 2026-09-07 22:56 UTCEG score recompute
  35. 2026-09-07 22:56 UTCVendor advisory
  36. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  37. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  38. 2026-09-06 11:46 UTCVendor advisory
  39. 2026-09-05 22:08 UTCEG score recompute
  40. 2026-09-05 22:08 UTCVendor advisory
  41. 2026-09-05 09:34 UTCEG score recompute
  42. 2026-09-05 09:34 UTCVendor advisory
  43. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  44. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  45. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  46. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  47. 2026-08-31 04:02 UTCEG score recompute
  48. 2026-08-31 04:02 UTCVendor advisory
  49. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  50. 2026-08-30 15:31 UTCVendor advisory
  51. 2026-08-30 02:37 UTCEG score recompute
  52. 2026-08-30 02:37 UTCVendor advisory
  53. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  54. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  55. 2026-08-28 01:41 UTCEG score recompute
  56. 2026-08-28 01:41 UTCVendor advisory
  57. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  58. 2026-08-27 11:43 UTCVendor advisory
  59. 2026-08-26 22:09 UTCEG score recompute
  60. 2026-08-26 22:09 UTCVendor advisory
  61. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  62. 2026-08-26 08:44 UTCVendor advisory
  63. 2026-08-25 20:13 UTCEG score recompute
  64. 2026-08-25 20:13 UTCVendor advisory
  65. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  66. 2026-08-25 07:28 UTCVendor advisory
  67. 2026-08-24 18:58 UTCEG score recompute
  68. 2026-08-24 18:58 UTCVendor advisory
  69. 2026-08-24 03:42 UTCVendor advisory
  70. 2026-08-23 14:23 UTCVendor advisory
  71. 2026-08-23 01:53 UTCEG score recompute
  72. 2026-08-23 01:53 UTCVendor advisory

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

Frequently asked(5)

What is CVE-2026-26197?
CVE-2026-26197 is a high-severity vulnerability; its CVE record was published on July 20, 2026. HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If a file is corrupted such that an array datatype's size, the number of elements, and the element size are not in agreement it can trigger an out of bounds read. The array datatype stores the…
When was the CVE record for CVE-2026-26197 published?
The CVE record for CVE-2026-26197 was published on July 20, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 29, 2026; the record at its source may have been updated since.
Is CVE-2026-26197 actively exploited?
CVE-2026-26197 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-26197?
CVE-2026-26197 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-26197?
A fix for CVE-2026-26197 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-26197 are linked in the Vendor Advisories panel on this page.

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