CVE-2026-7210

HIGHNVD 7.59.8▲
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory published 2026-05-11. NVD baseline CVSS 7.5; sources differ by 2.3.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

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

xml.parsers.expat and xml.etree.ElementTree use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.

CVSS v3
7.5
EG Score
9.8(medium)
EG Risk
—
EPSS
52.4%
KEV
Not listed

Published

May 11, 2026

Last Modified

June 15, 2026

Advisory Details (5)

Auto-updated May 16, 2026
No patch confirmed yet.
generic

oss-security - [CVE-2026-7210] Cpython: The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection

http://www.openwall.com/lists/oss-security/2026/05/11/8
generic

oss-security - Re: [CVE-2026-7210] Cpython: The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection

http://www.openwall.com/lists/oss-security/2026/05/11/13
generic

Mailman 3 [CVE-2026-7210] The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection - Security-announce - python.org

https://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/
generic

gh-149018: Use `XML_SetHashSalt16Bytes` in `pyexpat`/`_elementtree` when possible by StanFromIreland · Pull Request #149023 · python/cpython · GitHub

https://github.com/python/cpython/pull/149023
generic

[CVE-2026-7210] Insufficient entropy in `pyexpat` with protection against hash flooding · Issue #149018 · python/cpython · GitHub

https://github.com/python/cpython/issues/149018

Vendor Advisories for CVE-2026-7210(2)

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 10× in last 7d / 46× 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 190 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:25 UTCEPSS rescore
  4. 2026-07-21 15:25 UTCEPSS rescore
  5. 2026-07-20 17:08 UTCEPSS rescore
  6. 2026-07-19 14:31 UTCEPSS rescore
  7. 2026-07-19 02:29 UTCEPSS rescore
  8. 2026-07-18 10:04 UTCEPSS rescore
  9. 2026-07-16 17:03 UTCEPSS rescore
  10. 2026-07-16 09:19 UTCOSV refresh
  11. 2026-07-15 16:57 UTCEPSS rescore
  12. 2026-07-15 02:00 UTCEPSS rescore
  13. 2026-07-13 22:31 UTCEPSS rescore
  14. 2026-07-13 06:13 UTCEPSS rescore
  15. 2026-07-12 05:46 UTCEPSS rescore
  16. 2026-07-11 08:27 UTCEPSS rescore
  17. 2026-07-11 08:27 UTCEPSS rescore
  18. 2026-07-09 19:10 UTCEPSS rescore
  19. 2026-07-09 19:10 UTCEPSS rescore
  20. 2026-07-08 15:16 UTCEPSS rescore
  21. 2026-07-08 15:16 UTCEPSS rescore
  22. 2026-07-07 13:46 UTCEPSS rescore
  23. 2026-07-07 13:46 UTCEPSS rescore
  24. 2026-07-06 16:27 UTCEPSS rescore
  25. 2026-07-06 16:27 UTCEPSS rescore
Show 75 more
  1. 2026-07-06 02:23 UTCEPSS rescore
  2. 2026-07-06 02:23 UTCEPSS rescore
  3. 2026-07-05 02:31 UTCEPSS rescore
  4. 2026-07-05 02:30 UTCEPSS rescore
  5. 2026-07-04 06:31 UTCEPSS rescore
  6. 2026-07-04 06:31 UTCEPSS rescore
  7. 2026-07-01 15:07 UTCEPSS rescore
  8. 2026-06-30 23:22 UTCEPSS rescore
  9. 2026-06-29 14:06 UTCEPSS rescore
  10. 2026-06-28 14:07 UTCEPSS rescore
  11. 2026-06-28 08:46 UTCGHSA enrichment
  12. 2026-06-28 04:56 UTCEPSS rescore
  13. 2026-06-28 03:21 UTCGHSA enrichment
  14. 2026-06-27 13:21 UTCGHSA enrichment
  15. 2026-06-27 09:43 UTCGHSA enrichment
  16. 2026-06-27 03:08 UTCEPSS rescore
  17. 2026-06-26 21:05 UTCGHSA enrichment
  18. 2026-06-26 04:49 UTCGHSA enrichment
  19. 2026-06-25 13:50 UTCEPSS rescore
  20. 2026-06-24 14:05 UTCEPSS rescore
  21. 2026-06-23 21:33 UTCEPSS rescore
  22. 2026-06-22 14:25 UTCEPSS rescore
  23. 2026-06-22 14:25 UTCEPSS rescore
  24. 2026-06-21 14:56 UTCEPSS rescore
  25. 2026-06-21 14:56 UTCEPSS rescore
  26. 2026-06-21 01:59 UTCEPSS rescore
  27. 2026-06-21 01:59 UTCEPSS rescore
  28. 2026-06-19 19:26 UTCEPSS rescore
  29. 2026-06-19 19:26 UTCEPSS rescore
  30. 2026-06-18 17:52 UTCEPSS rescore
  31. 2026-06-18 17:52 UTCEPSS rescore
  32. 2026-06-17 17:53 UTCEPSS rescore
  33. 2026-06-17 05:25 UTCGHSA enrichment
  34. 2026-06-17 00:56 UTCGHSA enrichment
  35. 2026-06-16 17:53 UTCEPSS rescore
  36. 2026-06-16 11:57 UTCGHSA enrichment
  37. 2026-06-16 07:19 UTCGHSA enrichment
  38. 2026-06-15 18:09 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  39. 2026-06-15 17:49 UTCEPSS rescore
  40. 2026-06-15 17:49 UTCEPSS rescore
  41. 2026-06-15 05:26 UTCGHSA enrichment
  42. 2026-06-15 01:47 UTCGHSA enrichment
  43. 2026-06-14 23:18 UTCEPSS rescore
  44. 2026-06-14 22:09 UTCGHSA enrichment
  45. 2026-06-14 18:29 UTCGHSA enrichment
  46. 2026-06-14 14:32 UTCGHSA enrichment
  47. 2026-06-14 10:28 UTCGHSA enrichment
  48. 2026-06-14 06:42 UTCGHSA enrichment
  49. 2026-06-14 01:53 UTCGHSA enrichment
  50. 2026-06-13 23:00 UTCEPSS rescore
  51. 2026-06-13 08:05 UTCGHSA enrichment
  52. 2026-06-13 01:06 UTCGHSA enrichment
  53. 2026-06-12 23:12 UTCEPSS rescore
  54. 2026-06-12 23:12 UTCEPSS rescore
  55. 2026-06-12 21:29 UTCGHSA enrichment
  56. 2026-06-12 17:46 UTCGHSA enrichment
  57. 2026-06-12 14:03 UTCGHSA enrichment
  58. 2026-06-12 09:25 UTCGHSA enrichment
  59. 2026-06-12 05:44 UTCGHSA enrichment
  60. 2026-06-12 02:06 UTCGHSA enrichment
  61. 2026-06-11 22:28 UTCGHSA enrichment
  62. 2026-06-11 18:50 UTCGHSA enrichment
  63. 2026-06-11 15:12 UTCGHSA enrichment
  64. 2026-06-11 14:00 UTCEPSS rescore
  65. 2026-06-11 11:21 UTCGHSA enrichment
  66. 2026-06-11 07:43 UTCGHSA enrichment
  67. 2026-06-11 04:05 UTCGHSA enrichment
  68. 2026-06-11 00:08 UTCGHSA enrichment
  69. 2026-06-10 22:19 UTCEPSS rescore
  70. 2026-06-10 20:22 UTCGHSA enrichment
  71. 2026-06-10 16:44 UTCGHSA enrichment
  72. 2026-06-10 13:22 UTCEPSS rescore
  73. 2026-06-10 13:05 UTCGHSA enrichment
  74. 2026-06-10 09:28 UTCGHSA enrichment
  75. 2026-06-10 05:50 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-7210?
CVE-2026-7210 is a high vulnerability published on May 11, 2026. xml.parsers.expat and xml.etree.ElementTree use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.
When was CVE-2026-7210 disclosed?
CVE-2026-7210 was first published in the National Vulnerability Database on May 11, 2026, with the most recent update on June 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-7210 actively exploited?
CVE-2026-7210 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 52.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-7210?
CVE-2026-7210 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
How do I remediate CVE-2026-7210?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-7210, 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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