CVE-2021-47952

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-16. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

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

python jsonpickle 2.0.0 contains a remote code execution vulnerability that allows attackers to execute arbitrary Python commands by deserializing malicious JSON payloads containing py/repr objects. Attackers can craft JSON strings with py/repr directives that invoke the eval function during deserialization to execute arbitrary code.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
49.2%
KEV
Not listed

Published

May 16, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Jul 16, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

python jsonpickle 2.0.0 Remote Code Execution via py/repr | Advisories | VulnCheck

https://www.vulncheck.com/advisories/python-jsonpickle-remote-code-execution-via-py-repr
generic

GitHub - jsonpickle/jsonpickle: Python library for serializing any arbitrary object graph into JSON. It can take almost any Python object and turn the object into JSON. Additionally, it can reconstitute the object back into Python. · GitHub

https://github.com/jsonpickle/jsonpickle
generic

jsonpickle documentation

https://jsonpickle.github.io
generic🟡 PoC Available

python jsonpickle 2.0.0 - Remote Code Execution - Multiple remote Exploit

https://www.exploit-db.com/exploits/49585

Vendor Advisories for CVE-2021-47952(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 59× 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 258 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2021-47952?
CVE-2021-47952 is a critical vulnerability published on May 16, 2026. python jsonpickle 2.0.0 contains a remote code execution vulnerability that allows attackers to execute arbitrary Python commands by deserializing malicious JSON payloads containing py/repr objects. Attackers can craft JSON strings with py/repr directives that invoke the eval function during…
When was CVE-2021-47952 disclosed?
CVE-2021-47952 was first published in the National Vulnerability Database on May 16, 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-2021-47952 actively exploited?
CVE-2021-47952 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 49.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-47952?
CVE-2021-47952 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2021-47952?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47952, 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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