CVE-2026-87824

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-09. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

zstd-jni before 1.5.7-14 fails to validate the samples buffer capacity in Zstd.trainFromBufferDirect, allowing attackers to read past buffer boundaries by supplying oversized per-sample lengths. Attackers can trigger out-of-bounds memory access by providing crafted sample length arrays that cause the native implementation to walk past the buffer allocation, resulting in JVM termination.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
49
EG Risk 49/100CISA 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
30th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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

September 9, 2026

Last Modified

September 20, 2026

Advisory Details (7)

Auto-updated Sep 9, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
generic

zstd-jni 1.3.3-1 through 1.5.7-13 Out-of-Bounds Read via Zstd.trainFromBufferDirect | Advisories | VulnCheck

https://www.vulncheck.com/advisories/zstd-jni-1.3.3-1-through-1.5.7-13-out-of-bounds-read-via-zstd-trainfrombufferdirect
generic

GitHub - luben/zstd-jni: JNI binding for Zstd · GitHub

https://github.com/luben/zstd-jni
github_commit

commit 53d3c6342883 (luben/zstd-jni)

Fix landed in luben/zstd-jni commit 53d3c6342883 — awaiting tagged release

https://github.com/luben/zstd-jni/commit/53d3c6342883f7d6717b2477a7f9c1b4a4a56980
generic

zstd-jni/src/main/java/com/github/luben/zstd/Zstd.java at v1.5.7-13 · luben/zstd-jni · GitHub

https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/Zstd.java
generic

zstd-jni/src/main/native/jni_zdict.c at v1.5.7-13 · luben/zstd-jni · GitHub

https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/native/jni_zdict.c
github_commit

commit bba6cfca2c08 (luben/zstd-jni)

Fix landed in luben/zstd-jni commit bba6cfca2c08 — awaiting tagged release

https://github.com/luben/zstd-jni/commit/bba6cfca2c0897f1fa004f4193247479f10da853
github Patch Available🟡 PoC Available

Out-of-Bounds Read via Zstd.trainFromBufferDirect() Unchecked Sample Sizes · Advisory · luben/zstd-jni · GitHub

https://github.com/luben/zstd-jni/security/advisories/GHSA-257p-3h6w-pg7h

Vendor Advisories for CVE-2026-87824(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
redhatzstd-jni2026-09-24redhat

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

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
zstd-jni-java1.5.2-5+ds-3 ... 1.5.4-2+ds-3~exp4 (12 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
zstd-jni-java1.5.2-5+ds-7 ... 1.5.4-2+ds-3~exp4 (8 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
zstd-jni-java1.5.2-5+ds-7 ... 1.5.4-2+ds-3~exp4 (8 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 38× in last 7d / 124× 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 124 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-87824?
CVE-2026-87824 is a high vulnerability published on September 9, 2026. zstd-jni before 1.5.7-14 fails to validate the samples buffer capacity in Zstd.trainFromBufferDirect, allowing attackers to read past buffer boundaries by supplying oversized per-sample lengths. Attackers can trigger out-of-bounds memory access by providing crafted sample length arrays that cause…
When was CVE-2026-87824 disclosed?
CVE-2026-87824 was first published on September 9, 2026, with the most recent update on September 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87824 actively exploited?
CVE-2026-87824 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-87824?
CVE-2026-87824 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-87824?
A fix for CVE-2026-87824 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-87824 are linked in the Vendor Advisories panel on this page.

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