CVE-2026-39820

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-07. NVD baseline CVSS 7.5; sources differ by 0.0.

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.

Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
51.6%
KEV
Not listed

Published

May 7, 2026

Last Modified

July 6, 2026

Advisory Details (4)

Auto-updated Jun 5, 2026
No patch confirmed yet.
generic

GO-2026-4986 - Go Packages

https://pkg.go.dev/vuln/GO-2026-4986
generic
https://groups.google.com/g/golang-announce/c/qcCIEXso47M
generic

net/mail: ParseAddress: quadratic complexity in consumeComment · Issue #78566 · golang/go · GitHub

https://go.dev/issue/78566
generic
https://go.dev/cl/759940

Vendor Advisories for CVE-2026-39820(8)

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)
Go(1)
PackageVulnerable rangeFixed inDependents
stdlib—1.26.3—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 75× 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 137 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-39820?
CVE-2026-39820 is a high vulnerability published on May 7, 2026. Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.
When was CVE-2026-39820 disclosed?
CVE-2026-39820 was first published in the National Vulnerability Database on May 7, 2026, with the most recent update on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39820 actively exploited?
CVE-2026-39820 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 51.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-39820?
CVE-2026-39820 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-39820?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39820, 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.

Dependency Blast Radius

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