CVE-2026-26200

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 71% 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, secondary
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

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

HDF5 is software for managing data. Prior to version 1.14.4-2, an attacker who can control an h5 file parsed by HDF5 can trigger a write-based heap buffer overflow condition. This can lead to a denial-of-service condition, and potentially further issues such as remote code execution depending on the practical exploitability of the heap overflow against modern operating systems. Real-world exploitability of this issue in terms of remote-code execution is currently unknown. Version 1.14.4-2 fixes the issue.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

February 19, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Jul 1, 2026
🔬 Proof of concept available. Patch available. Sources: github, redhat.
redhat
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26200.json
redhat

2441088 – (CVE-2026-26200) CVE-2026-26200 hdf5: HDF5: Denial of Service due to heap buffer overflow when parsing a crafted h5 file

https://bugzilla.redhat.com/show_bug.cgi?id=2441088
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-26200
github Patch Available🟡 PoC Available

H5T__conv_struct_opt Heap Buffer Overflow · Advisory · HDFGroup/hdf5 · GitHub

https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5p2m-j456-9mr2

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
hdf51.10.10+repack-1 ... 2.1.0+repack-1~exp9 (82 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
hdf51.10.10+repack-1 ... 2.1.0+repack-1~exp9 (71 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
hdf51.14.5+repack-3 ... 2.1.0+repack-1~exp9 (40 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
hdf51.14.5+repack-3 ... 2.1.0+repack-1~exp9 (40 versions)——

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 34× 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.

  1. 2026-08-25 13:48 UTCEPSS rescore
  2. 2026-08-23 00:19 UTCEPSS rescore
  3. 2026-08-21 23:49 UTCEPSS rescore
  4. 2026-08-20 22:55 UTCEPSS rescore
  5. 2026-08-19 17:03 UTCEPSS rescore
  6. 2026-08-18 13:48 UTCEPSS rescore
  7. 2026-08-17 13:47 UTCEPSS rescore
  8. 2026-08-16 14:56 UTCEPSS rescore
  9. 2026-08-16 02:14 UTCEPSS rescore
  10. 2026-08-15 01:30 UTCEPSS rescore
  11. 2026-08-14 09:33 UTCEG score recompute
  12. 2026-08-13 22:00 UTCEPSS rescore
  13. 2026-08-13 01:44 UTCEG score recompute
  14. 2026-08-12 13:50 UTCEPSS rescore
  15. 2026-08-12 02:00 UTCEG score recompute
  16. 2026-08-11 13:42 UTCEPSS rescore
  17. 2026-08-11 07:09 UTCEG score recompute
  18. 2026-08-11 00:00 UTCEPSS rescore
  19. 2026-08-09 21:56 UTCEG score recompute
  20. 2026-08-09 13:46 UTCEPSS rescore
  21. 2026-08-09 09:09 UTCEG score recompute
  22. 2026-08-08 16:37 UTCEPSS rescore
  23. 2026-08-07 21:24 UTCEG score recompute
  24. 2026-08-06 13:46 UTCEPSS rescore
  25. 2026-08-06 03:25 UTCEG score recompute
Show 58 more
  1. 2026-08-05 19:17 UTCEPSS rescore
  2. 2026-08-04 15:10 UTCEPSS rescore
  3. 2026-08-03 10:36 UTCEPSS rescore
  4. 2026-08-02 20:06 UTCEG score recompute
  5. 2026-08-02 02:26 UTCEPSS rescore
  6. 2026-08-01 04:16 UTCEPSS rescore
  7. 2026-07-30 16:27 UTCEPSS rescore
  8. 2026-07-30 01:30 UTCEPSS rescore
  9. 2026-07-28 15:36 UTCEPSS rescore
  10. 2026-07-26 14:54 UTCEPSS rescore
  11. 2026-07-26 14:54 UTCEPSS rescore
  12. 2026-07-25 14:18 UTCEPSS rescore
  13. 2026-07-25 14:17 UTCEPSS rescore
  14. 2026-07-24 14:17 UTCEPSS rescore
  15. 2026-07-23 14:18 UTCEPSS rescore
  16. 2026-07-23 14:18 UTCEPSS rescore
  17. 2026-07-23 03:07 UTCEG score recompute
  18. 2026-07-22 14:08 UTCEPSS rescore
  19. 2026-07-22 14:08 UTCEPSS rescore
  20. 2026-07-21 15:24 UTCEPSS rescore
  21. 2026-07-21 15:24 UTCEPSS rescore
  22. 2026-07-20 17:08 UTCEPSS rescore
  23. 2026-07-20 17:08 UTCEPSS rescore
  24. 2026-07-19 14:31 UTCEPSS rescore
  25. 2026-07-19 14:31 UTCEPSS rescore
  26. 2026-07-19 02:29 UTCEPSS rescore
  27. 2026-07-18 10:04 UTCEPSS rescore
  28. 2026-07-18 10:04 UTCEPSS rescore
  29. 2026-07-18 07:29 UTCOSV refresh
  30. 2026-07-16 17:03 UTCEPSS rescore
  31. 2026-07-16 17:03 UTCEPSS rescore
  32. 2026-07-15 16:57 UTCEPSS rescore
  33. 2026-07-15 16:57 UTCEPSS rescore
  34. 2026-07-15 02:00 UTCEPSS rescore
  35. 2026-07-15 02:00 UTCEPSS rescore
  36. 2026-07-13 22:30 UTCEPSS rescore
  37. 2026-07-13 06:13 UTCEPSS rescore
  38. 2026-07-13 06:13 UTCEPSS rescore
  39. 2026-07-12 05:46 UTCEPSS rescore
  40. 2026-07-12 05:46 UTCEPSS rescore
  41. 2026-07-11 08:27 UTCEPSS rescore
  42. 2026-07-09 19:10 UTCEPSS rescore
  43. 2026-07-08 15:15 UTCEPSS rescore
  44. 2026-07-08 15:15 UTCEPSS rescore
  45. 2026-07-07 13:46 UTCEPSS rescore
  46. 2026-07-06 16:27 UTCEPSS rescore
  47. 2026-07-06 16:27 UTCEPSS rescore
  48. 2026-07-06 02:23 UTCEPSS rescore
  49. 2026-07-06 02:23 UTCEPSS rescore
  50. 2026-07-05 02:30 UTCEPSS rescore
  51. 2026-07-04 06:31 UTCEPSS rescore
  52. 2026-07-04 06:31 UTCEPSS rescore
  53. 2026-07-01 15:06 UTCEPSS rescore
  54. 2026-07-01 15:06 UTCEPSS rescore
  55. 2026-06-30 23:22 UTCEPSS rescore
  56. 2026-06-30 23:22 UTCEPSS rescore
  57. 2026-06-30 04:42 UTCEG score recompute
  58. 2026-06-30 04:31 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-26200?
CVE-2026-26200 is a high vulnerability published on February 19, 2026. HDF5 is software for managing data. Prior to version 1.14.4-2, an attacker who can control an h5 file parsed by HDF5 can trigger a write-based heap buffer overflow condition. This can lead to a denial-of-service condition, and potentially further issues such as remote code execution depending on…
When was CVE-2026-26200 disclosed?
CVE-2026-26200 was first published in the National Vulnerability Database on February 19, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-26200 actively exploited?
CVE-2026-26200 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 71.8% of all scored CVEs.
What is the CVSS score of CVE-2026-26200?
CVE-2026-26200 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-26200?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-26200, 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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