CVE-2026-87824

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

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, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-75022 (ENISA EUVD) · GHSA-v36p-vv44-8qfg (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • 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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
33rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). 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)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

September 9, 2026

Last Modified

September 20, 2026

Advisory Details (7)

Auto-updated Sep 9, 2026
Patch available. Sources: github, github_commit.
Web page

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
Web page

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
Web page

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
Web page

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 advisoryMentions a patch (unverified)

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

Patch Availability(14)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatzstd-jni2026-11-04redhat
redhatocp-tools-4/jenkins-rhel9:17920402872026-10-22redhat
redhatocp-tools-4/jenkins-rhel9:17920407332026-10-22redhat
redhatocp-tools-4/jenkins-rhel8:17920443862026-10-22redhat
redhatocp-tools-4/jenkins-rhel9:17920401312026-10-22redhat
redhatocp-tools-4/jenkins-rhel8:17920443262026-10-22redhat
redhatocp-tools-4/jenkins-rhel8:17920443822026-10-22redhat
redhatocp-tools-4/jenkins-rhel9:17920400812026-10-22redhat
redhatocp-tools-4/jenkins-rhel9:17920404282026-10-22redhat
redhatocp-tools-4/jenkins-rhel8:17920443272026-10-22redhat
redhatocp-tools-4/jenkins-rhel9:17920415142026-10-22redhat
redhatocp-tools-4/jenkins-rhel9:17920400962026-10-22redhat
redhatrhoai/odh-th06-rocm64-torch291-py312-rhel9:17918721192026-10-19redhat
redhatcom.github.luben/zstd-jni:1.5.7.16-rhel8-redhat-000012026-09-22redhat

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 ... 1.5.7-23+ds-2 (14 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
zstd-jni-java1.5.2-5+ds-7 ... 1.5.7-23+ds-2 (10 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 up to 1.5.7-23+ds-1: fixed in 1.5.7-23+ds-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 39× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 216 rows 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. None are among the latest 100 rows. The 116 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:58 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  2. 2026-11-13 01:15 UTCEchelonGraph re-scored
  3. 2026-11-13 01:15 UTCVendor advisory
  4. 2026-11-13 01:15 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  5. 2026-11-12 16:35 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  6. 2026-11-11 16:41 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  7. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  8. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  9. 2026-11-08 16:41 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  10. 2026-11-07 16:40 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  11. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  12. 2026-11-05 16:39 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  13. 2026-11-05 10:24 UTCEchelonGraph re-scored
  14. 2026-11-05 10:24 UTCVendor advisory
  15. 2026-11-05 10:24 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  16. 2026-11-04 16:37 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  17. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  18. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  19. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  20. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  21. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  22. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  23. 2026-10-28 19:24 UTCEchelonGraph re-scored
  24. 2026-10-28 19:24 UTCVendor advisory
  25. 2026-10-28 19:24 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
Show 75 more
  1. 2026-10-28 16:55 UTCOSV refresh
  2. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  3. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  4. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  5. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  6. 2026-10-25 13:53 UTCEchelonGraph re-scored
  7. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  8. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  9. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  10. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  11. 2026-10-20 19:49 UTCEchelonGraph re-scored
  12. 2026-10-20 19:49 UTCVendor advisory
  13. 2026-10-20 19:49 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  14. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  15. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  16. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  17. 2026-10-18 03:03 UTCEchelonGraph re-scored
  18. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  19. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  20. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  21. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  22. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  23. 2026-10-13 05:05 UTCEchelonGraph re-scored
  24. 2026-10-13 05:05 UTCVendor advisory
  25. 2026-10-13 05:05 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  26. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  27. 2026-10-12 14:49 UTCEchelonGraph re-scored
  28. 2026-10-11 21:57 UTCVendor advisory
  29. 2026-10-11 21:57 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  30. 2026-10-11 19:16 UTCEchelonGraph re-scored
  31. 2026-10-11 16:33 UTCEchelonGraph re-scored
  32. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  33. 2026-10-11 13:49 UTCEchelonGraph re-scored
  34. 2026-10-11 07:17 UTCEchelonGraph re-scored
  35. 2026-10-11 07:17 UTCVendor advisory
  36. 2026-10-11 07:17 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  37. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  38. 2026-10-10 19:42 UTCVendor advisory
  39. 2026-10-10 19:42 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  40. 2026-10-10 08:18 UTCVendor advisory
  41. 2026-10-10 08:17 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  42. 2026-10-09 20:08 UTCEchelonGraph re-scored
  43. 2026-10-09 20:08 UTCVendor advisory
  44. 2026-10-09 20:08 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  45. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  46. 2026-10-08 23:59 UTCEchelonGraph re-scored
  47. 2026-10-08 23:59 UTCVendor advisory
  48. 2026-10-08 23:59 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  49. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  50. 2026-10-08 07:05 UTCEchelonGraph re-scored
  51. 2026-10-08 07:05 UTCVendor advisory
  52. 2026-10-08 07:05 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  53. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  54. 2026-10-07 20:00 UTCVendor advisory
  55. 2026-10-07 20:00 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  56. 2026-10-07 06:00 UTCVendor advisory
  57. 2026-10-07 06:00 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  58. 2026-10-06 18:54 UTCEchelonGraph re-scored
  59. 2026-10-06 18:54 UTCVendor advisory
  60. 2026-10-06 18:54 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  61. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  62. 2026-10-06 07:49 UTCVendor advisory
  63. 2026-10-06 07:49 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  64. 2026-10-05 20:44 UTCEchelonGraph re-scored
  65. 2026-10-05 20:44 UTCVendor advisory
  66. 2026-10-05 20:44 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  67. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  68. 2026-10-05 09:39 UTCEchelonGraph re-scored
  69. 2026-10-05 09:39 UTCVendor advisory
  70. 2026-10-05 09:39 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  71. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  72. 2026-10-04 22:34 UTCVendor advisory
  73. 2026-10-04 22:34 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5
  74. 2026-10-04 11:29 UTCVendor advisory
  75. 2026-10-04 11:29 UTCGHSA enrichmentGHSA-v36p-vv44-8qfg · GitHub severity HIGH · GitHub CVSS 7.5

Frequently asked(5)

What is CVE-2026-87824?
CVE-2026-87824 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-87824 was made public on August 19, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on September 9, 2026. EchelonGraph's copy of the record carries a last-modified date of September 20, 2026; the record at its source may have been updated since.
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 (33rd 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.

Dependency Blast Radius

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