CVE-2026-8295

MEDIUMNVD 6.96.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.9 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 80% 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, nvd
6.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.9Exploit: NoneExposed: 0

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

An integer overflow vulnerability in the simdjson document-builder API allows incorrect buffer size calculations in "string_builder::escape_and_append()" when processing very large input strings on platforms with limited "size_t" width (e.g., 32-bit builds). The overflow can cause insufficient buffer allocation, leading to out-of-bounds memory reads in SIMD routines and potentially resulting in information disclosure, memory corruption, or malformed JSON output. This vulnerability has been fixed in 4.6.4 release

CVSS v3
6.9
EG Score
6.9(medium)
EPSS
19.9%
KEV
Not listed

Published

May 14, 2026

Last Modified

May 19, 2026

Advisory Details (2)

Auto-updated May 14, 2026
No patch confirmed yet.
generic

Release Version 4.6.4 · simdjson/simdjson · GitHub

https://github.com/simdjson/simdjson/releases/tag/v4.6.4
generic

Podatność w bibliotece simdjson | CERT Polska

https://cert.pl/posts/2026/05/CVE-2026-8295

Vendor Advisories for CVE-2026-8295(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 7× in last 7d / 45× 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 107 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-8295?
CVE-2026-8295 is a medium vulnerability published on May 14, 2026. An integer overflow vulnerability in the simdjson document-builder API allows incorrect buffer size calculations in "stringbuilder::escapeandappend()" when processing very large input strings on platforms with limited "sizet" width (e.g., 32-bit builds). The overflow can cause insufficient buffer…
When was CVE-2026-8295 disclosed?
CVE-2026-8295 was first published in the National Vulnerability Database on May 14, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8295 actively exploited?
CVE-2026-8295 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8295?
CVE-2026-8295 has a CVSS v3 base score of 6.9 (NVD).
How do I remediate CVE-2026-8295?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8295, 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.

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