CVE-2026-48207

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-21. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
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.

Deserialization of untrusted data in Apache Fory PyFory. PyFory's ReduceSerializer could bypass documented DeserializationPolicy validation hooks during reduce-state restoration and global-name resolution. An application is vulnerable if it deserializes attacker-controlled data using PyFory Python-native mode with strict mode disabled and relies on DeserializationPolicy to restrict unsafe classes, functions, or module attributes.

This issue affects Apache Fory: from before 1.0.0.

Mitigation: Users of Apache Fory are recommended to upgrade to version 1.0.0 or later, which enforces DeserializationPolicy validation for the affected ReduceSerializer paths and thus fixes this issue.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
43.5%
KEV
Not listed

Published

May 21, 2026

Last Modified

May 22, 2026

Advisory Details (2)

Auto-updated Jun 20, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-48207: Apache Fory: PyFory ReduceSerializer Incomplete Policy Enforcement

http://www.openwall.com/lists/oss-security/2026/05/21/10
generic

Apache Fory™ Download | Apache Fory™

https://fory.apache.org/security/#cve-2026-48207-pyfory-reduceserializer-deserializationpolicy-bypass

Vendor Advisories for CVE-2026-48207(1)

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

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
pyfory0.13.0 ... 0.17.0 (8 versions)1.0.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 87× 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 299 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 22:30 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. 2026-07-08 15:16 UTCEPSS rescore
  9. 2026-07-07 13:46 UTCEPSS rescore
  10. 2026-07-06 16:27 UTCEPSS rescore
  11. 2026-07-06 02:23 UTCEPSS rescore
  12. 2026-07-05 02:30 UTCEPSS rescore
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-01 15:07 UTCEPSS rescore
  15. 2026-06-30 23:22 UTCEPSS rescore
  16. 2026-06-29 20:06 UTCEG score recompute
  17. 2026-06-29 20:06 UTCGHSA enrichment
  18. 2026-06-29 14:06 UTCEPSS rescore
  19. 2026-06-29 14:06 UTCEPSS rescore
  20. 2026-06-28 14:07 UTCEPSS rescore
  21. 2026-06-28 11:54 UTCEG score recompute
  22. 2026-06-28 11:53 UTCGHSA enrichment
  23. 2026-06-28 07:53 UTCEG score recompute
  24. 2026-06-28 07:53 UTCGHSA enrichment
  25. 2026-06-28 04:56 UTCEPSS rescore
Show 75 more
  1. 2026-06-28 04:56 UTCEPSS rescore
  2. 2026-06-28 03:54 UTCEG score recompute
  3. 2026-06-28 03:54 UTCGHSA enrichment
  4. 2026-06-27 23:55 UTCEG score recompute
  5. 2026-06-27 23:55 UTCGHSA enrichment
  6. 2026-06-27 19:57 UTCEG score recompute
  7. 2026-06-27 19:57 UTCGHSA enrichment
  8. 2026-06-27 12:04 UTCEG score recompute
  9. 2026-06-27 12:04 UTCGHSA enrichment
  10. 2026-06-27 07:23 UTCEG score recompute
  11. 2026-06-27 07:23 UTCGHSA enrichment
  12. 2026-06-27 03:08 UTCEPSS rescore
  13. 2026-06-26 23:20 UTCEG score recompute
  14. 2026-06-26 23:20 UTCGHSA enrichment
  15. 2026-06-26 19:22 UTCEG score recompute
  16. 2026-06-26 19:22 UTCGHSA enrichment
  17. 2026-06-26 03:36 UTCEG score recompute
  18. 2026-06-26 03:36 UTCGHSA enrichment
  19. 2026-06-25 23:16 UTCEG score recompute
  20. 2026-06-25 23:16 UTCGHSA enrichment
  21. 2026-06-25 18:23 UTCEG score recompute
  22. 2026-06-25 18:23 UTCGHSA enrichment
  23. 2026-06-25 14:21 UTCEG score recompute
  24. 2026-06-25 14:21 UTCGHSA enrichment
  25. 2026-06-25 13:49 UTCEPSS rescore
  26. 2026-06-24 14:05 UTCEPSS rescore
  27. 2026-06-23 21:33 UTCEPSS rescore
  28. 2026-06-23 21:33 UTCEPSS rescore
  29. 2026-06-22 14:25 UTCEPSS rescore
  30. 2026-06-22 14:25 UTCEPSS rescore
  31. 2026-06-21 14:56 UTCEPSS rescore
  32. 2026-06-21 14:56 UTCEPSS rescore
  33. 2026-06-21 01:59 UTCEPSS rescore
  34. 2026-06-21 01:59 UTCEPSS rescore
  35. 2026-06-19 19:26 UTCEPSS rescore
  36. 2026-06-19 19:26 UTCEPSS rescore
  37. 2026-06-18 17:52 UTCEPSS rescore
  38. 2026-06-18 17:52 UTCEPSS rescore
  39. 2026-06-18 03:55 UTCEG score recompute
  40. 2026-06-18 03:55 UTCGHSA enrichment
  41. 2026-06-17 23:57 UTCEG score recompute
  42. 2026-06-17 23:57 UTCGHSA enrichment
  43. 2026-06-17 19:59 UTCEG score recompute
  44. 2026-06-17 19:58 UTCGHSA enrichment
  45. 2026-06-17 17:53 UTCEPSS rescore
  46. 2026-06-17 15:10 UTCEG score recompute
  47. 2026-06-17 15:10 UTCGHSA enrichment
  48. 2026-06-17 11:11 UTCEG score recompute
  49. 2026-06-17 11:11 UTCGHSA enrichment
  50. 2026-06-17 03:54 UTCEG score recompute
  51. 2026-06-17 03:54 UTCGHSA enrichment
  52. 2026-06-16 23:55 UTCEG score recompute
  53. 2026-06-16 23:55 UTCGHSA enrichment
  54. 2026-06-16 19:57 UTCEG score recompute
  55. 2026-06-16 19:57 UTCGHSA enrichment
  56. 2026-06-16 17:53 UTCEPSS rescore
  57. 2026-06-16 10:45 UTCEG score recompute
  58. 2026-06-16 10:45 UTCGHSA enrichment
  59. 2026-06-16 06:44 UTCEG score recompute
  60. 2026-06-16 06:44 UTCGHSA enrichment
  61. 2026-06-16 02:46 UTCEG score recompute
  62. 2026-06-16 02:46 UTCGHSA enrichment
  63. 2026-06-15 22:48 UTCEG score recompute
  64. 2026-06-15 22:47 UTCGHSA enrichment
  65. 2026-06-15 17:49 UTCEPSS rescore
  66. 2026-06-15 17:49 UTCEPSS rescore
  67. 2026-06-15 15:38 UTCEG score recompute
  68. 2026-06-15 15:38 UTCGHSA enrichment
  69. 2026-06-15 06:20 UTCEG score recompute
  70. 2026-06-15 06:20 UTCGHSA enrichment
  71. 2026-06-15 02:19 UTCEG score recompute
  72. 2026-06-15 02:19 UTCGHSA enrichment
  73. 2026-06-14 23:18 UTCEPSS rescore
  74. 2026-06-14 22:20 UTCEG score recompute
  75. 2026-06-14 22:20 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-48207?
CVE-2026-48207 is a critical vulnerability published on May 21, 2026. Deserialization of untrusted data in Apache Fory PyFory. PyFory's ReduceSerializer could bypass documented DeserializationPolicy validation hooks during reduce-state restoration and global-name resolution. An application is vulnerable if it deserializes attacker-controlled data using PyFory…
When was CVE-2026-48207 disclosed?
CVE-2026-48207 was first published in the National Vulnerability Database on May 21, 2026, with the most recent update on May 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48207 actively exploited?
CVE-2026-48207 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 43.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-48207?
CVE-2026-48207 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-48207?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48207, 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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