CVE-2026-90559

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-12. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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

snappy-java through 1.1.10.8 contains an out-of-bounds write vulnerability in Snappy.uncompress(ByteBuffer, ByteBuffer) because destination buffer capacity is never validated against decompressed size. Attackers can supply valid compressed data that decompresses larger than the destination buffer, causing writes past buffer boundaries and 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%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend 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 at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.6%
EPSS %ILE
48th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend 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 at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

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 12, 2026

Last Modified

September 24, 2026

Advisory Details (4)

Auto-updated Sep 12, 2026
No patch confirmed yet.
generic

snappy-java through 1.1.10.8 Out-of-Bounds Write via uncompress | Advisories | VulnCheck

https://www.vulncheck.com/advisories/snappy-java-through-1.1.10.8-out-of-bounds-write-via-uncompress
generic

Off heap OOB Write in ByteBuffer Uncompress · Issue #728 · xerial/snappy-java · GitHub

https://github.com/xerial/snappy-java/issues/728
generic

snappy-java/src/main/java/org/xerial/snappy/Snappy.java at v1.1.10.8 · xerial/snappy-java · GitHub

https://github.com/xerial/snappy-java/blob/v1.1.10.8/src/main/java/org/xerial/snappy/Snappy.java#L561
generic

GitHub - xerial/snappy-java: Snappy compressor/decompressor for Java · GitHub

https://github.com/xerial/snappy-java

Vendor Advisories for CVE-2026-90559(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 26× in last 7d / 91× 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. 2026-10-05 02:24 UTCEG score recompute
  2. 2026-10-05 02:24 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 14:24 UTCGHSA enrichment
  5. 2026-10-04 02:05 UTCEG score recompute
  6. 2026-10-04 02:05 UTCGHSA enrichment
  7. 2026-10-03 14:05 UTCGHSA enrichment
  8. 2026-10-03 01:55 UTCEG score recompute
  9. 2026-10-03 01:55 UTCGHSA enrichment
  10. 2026-10-02 13:55 UTCGHSA enrichment
  11. 2026-10-02 01:53 UTCEG score recompute
  12. 2026-10-02 01:53 UTCGHSA enrichment
  13. 2026-10-01 19:51 UTCEPSS rescore
  14. 2026-10-01 13:38 UTCGHSA enrichment
  15. 2026-10-01 01:38 UTCEG score recompute
  16. 2026-10-01 01:38 UTCGHSA enrichment
  17. 2026-09-30 15:04 UTCEPSS rescore
  18. 2026-09-30 13:39 UTCGHSA enrichment
  19. 2026-09-30 01:36 UTCEG score recompute
  20. 2026-09-30 01:36 UTCGHSA enrichment
  21. 2026-09-29 09:14 UTCEG score recompute
  22. 2026-09-29 09:14 UTCGHSA enrichment
  23. 2026-09-28 21:14 UTCEG score recompute
  24. 2026-09-28 21:14 UTCGHSA enrichment
  25. 2026-09-28 13:52 UTCEPSS rescore
Show 66 more
  1. 2026-09-28 13:52 UTCEPSS rescore
  2. 2026-09-28 09:13 UTCGHSA enrichment
  3. 2026-09-27 21:13 UTCEG score recompute
  4. 2026-09-27 21:13 UTCGHSA enrichment
  5. 2026-09-27 13:49 UTCEPSS rescore
  6. 2026-09-27 09:13 UTCGHSA enrichment
  7. 2026-09-26 21:11 UTCEG score recompute
  8. 2026-09-26 21:11 UTCGHSA enrichment
  9. 2026-09-26 15:59 UTCEPSS rescore
  10. 2026-09-26 09:11 UTCEG score recompute
  11. 2026-09-26 09:11 UTCGHSA enrichment
  12. 2026-09-25 21:00 UTCGHSA enrichment
  13. 2026-09-25 08:35 UTCGHSA enrichment
  14. 2026-09-24 20:35 UTCGHSA enrichment
  15. 2026-09-24 20:01 UTCEG score recompute
  16. 2026-09-24 20:01 UTCGHSA enrichment
  17. 2026-09-24 14:04 UTCEPSS rescore
  18. 2026-09-24 08:01 UTCGHSA enrichment
  19. 2026-09-23 20:01 UTCEG score recompute
  20. 2026-09-23 20:01 UTCGHSA enrichment
  21. 2026-09-23 17:54 UTCEPSS rescore
  22. 2026-09-23 08:01 UTCGHSA enrichment
  23. 2026-09-22 20:01 UTCEG score recompute
  24. 2026-09-22 20:00 UTCGHSA enrichment
  25. 2026-09-22 16:01 UTCEPSS rescore
  26. 2026-09-22 08:01 UTCEG score recompute
  27. 2026-09-22 08:00 UTCGHSA enrichment
  28. 2026-09-21 21:09 UTCEPSS rescore
  29. 2026-09-21 20:00 UTCGHSA enrichment
  30. 2026-09-21 08:00 UTCEG score recompute
  31. 2026-09-21 08:00 UTCGHSA enrichment
  32. 2026-09-20 20:16 UTCEPSS rescore
  33. 2026-09-20 20:00 UTCGHSA enrichment
  34. 2026-09-20 08:00 UTCGHSA enrichment
  35. 2026-09-19 19:36 UTCEG score recompute
  36. 2026-09-19 19:36 UTCGHSA enrichment
  37. 2026-09-19 07:35 UTCGHSA enrichment
  38. 2026-09-18 19:35 UTCEG score recompute
  39. 2026-09-18 19:35 UTCGHSA enrichment
  40. 2026-09-18 19:28 UTCEPSS rescore
  41. 2026-09-18 07:35 UTCGHSA enrichment
  42. 2026-09-17 19:35 UTCEG score recompute
  43. 2026-09-17 19:35 UTCGHSA enrichment
  44. 2026-09-17 19:32 UTCEPSS rescore
  45. 2026-09-17 07:22 UTCGHSA enrichment
  46. 2026-09-16 19:21 UTCEG score recompute
  47. 2026-09-16 19:21 UTCGHSA enrichment
  48. 2026-09-16 14:09 UTCEPSS rescore
  49. 2026-09-16 07:21 UTCEG score recompute
  50. 2026-09-16 07:21 UTCGHSA enrichment
  51. 2026-09-16 05:15 UTCEPSS rescore
  52. 2026-09-15 19:21 UTCGHSA enrichment
  53. 2026-09-15 07:21 UTCEG score recompute
  54. 2026-09-15 07:21 UTCGHSA enrichment
  55. 2026-09-15 03:12 UTCEPSS rescore
  56. 2026-09-14 19:21 UTCEG score recompute
  57. 2026-09-14 19:21 UTCGHSA enrichment
  58. 2026-09-14 18:28 UTCEG score recompute
  59. 2026-09-14 18:28 UTCGHSA enrichment
  60. 2026-09-14 06:27 UTCGHSA enrichment
  61. 2026-09-13 18:27 UTCGHSA enrichment
  62. 2026-09-13 06:27 UTCEG score recompute
  63. 2026-09-13 06:27 UTCGHSA enrichment
  64. 2026-09-12 18:27 UTCEG score recompute
  65. 2026-09-12 18:12 UTCEG score recompute
  66. 2026-09-12 18:12 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-90559?
CVE-2026-90559 is a high vulnerability published on September 12, 2026. snappy-java through 1.1.10.8 contains an out-of-bounds write vulnerability in Snappy.uncompress(ByteBuffer, ByteBuffer) because destination buffer capacity is never validated against decompressed size. Attackers can supply valid compressed data that decompresses larger than the destination buffer,…
When was CVE-2026-90559 disclosed?
CVE-2026-90559 was first published on September 12, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90559 actively exploited?
CVE-2026-90559 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-90559?
CVE-2026-90559 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-2026-90559?
No fix for CVE-2026-90559 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-2026-90559 are linked in the Vendor Advisories panel on this page.

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