CVE-2026-37737

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-06-05. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

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

sanic-cors version 2.2.0 and prior contains an improper regular expression in the try_match() function in sanic_cors/core.py that uses re.match without end-anchoring. This allows an attacker to bypass CORS origin allowlists by registering a domain that begins with a trusted origin string, to gain unauthorized access to cross-origin requests for authenticated resources.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
6.0%
KEV
Not listed

Published

June 5, 2026

Last Modified

June 5, 2026

Advisory Details (4)

Auto-updated Jun 12, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Sanic-Cors · PyPI

https://pypi.org/project/Sanic-Cors/
generic🟡 PoC Available

security-advisories/CVE-2026-37737-sanic-cors-advisory.md at main · npbhatter17/security-advisories · GitHub

https://github.com/npbhatter17/security-advisories/blob/main/CVE-2026-37737-sanic-cors-advisory.md
generic

sanic-cors/sanic_cors/core.py at master · ashleysommer/sanic-cors · GitHub

https://github.com/ashleysommer/sanic-cors/blob/master/sanic_cors/core.py
generic

GitHub - ashleysommer/sanic-cors: A Sanic extension for handling Cross Origin Resource Sharing (CORS), making cross-origin AJAX possible. Based on flask-cors by Cory Dolphin. · GitHub

https://github.com/ashleysommer/sanic-cors

Vendor Advisories for CVE-2026-37737(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 16× in last 7d / 85× 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.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-05 23:48 UTCEG score recompute
  4. 2026-07-05 23:48 UTCGHSA enrichment
  5. 2026-07-05 02:30 UTCEPSS rescore
  6. 2026-07-04 20:55 UTCEG score recompute
  7. 2026-07-04 20:55 UTCGHSA enrichment
  8. 2026-07-04 06:31 UTCEPSS rescore
  9. 2026-07-03 16:56 UTCEG score recompute
  10. 2026-07-03 16:56 UTCGHSA enrichment
  11. 2026-07-02 01:08 UTCEG score recompute
  12. 2026-07-02 01:08 UTCGHSA enrichment
  13. 2026-07-01 15:06 UTCEPSS rescore
  14. 2026-06-30 23:22 UTCEPSS rescore
  15. 2026-06-30 22:35 UTCEG score recompute
  16. 2026-06-30 22:35 UTCGHSA enrichment
  17. 2026-06-29 20:12 UTCEG score recompute
  18. 2026-06-29 14:06 UTCEPSS rescore
  19. 2026-06-28 17:52 UTCEG score recompute
  20. 2026-06-28 17:52 UTCGHSA enrichment
  21. 2026-06-28 14:07 UTCEPSS rescore
  22. 2026-06-28 04:56 UTCEPSS rescore
  23. 2026-06-27 15:31 UTCEG score recompute
  24. 2026-06-27 15:31 UTCGHSA enrichment
  25. 2026-06-27 03:08 UTCEPSS rescore
Show 63 more
  1. 2026-06-26 13:10 UTCEG score recompute
  2. 2026-06-26 13:10 UTCGHSA enrichment
  3. 2026-06-25 13:49 UTCEPSS rescore
  4. 2026-06-25 13:49 UTCEPSS rescore
  5. 2026-06-25 04:05 UTCEG score recompute
  6. 2026-06-25 04:05 UTCGHSA enrichment
  7. 2026-06-24 14:05 UTCEPSS rescore
  8. 2026-06-24 01:41 UTCEG score recompute
  9. 2026-06-24 01:41 UTCGHSA enrichment
  10. 2026-06-23 21:33 UTCEPSS rescore
  11. 2026-06-22 23:19 UTCEG score recompute
  12. 2026-06-22 23:19 UTCGHSA enrichment
  13. 2026-06-22 14:25 UTCEPSS rescore
  14. 2026-06-22 14:25 UTCEPSS rescore
  15. 2026-06-21 14:56 UTCEPSS rescore
  16. 2026-06-21 14:56 UTCEPSS rescore
  17. 2026-06-21 01:59 UTCEPSS rescore
  18. 2026-06-20 14:48 UTCEG score recompute
  19. 2026-06-20 14:48 UTCGHSA enrichment
  20. 2026-06-19 19:25 UTCEPSS rescore
  21. 2026-06-19 19:25 UTCEPSS rescore
  22. 2026-06-19 12:19 UTCEG score recompute
  23. 2026-06-19 12:19 UTCGHSA enrichment
  24. 2026-06-18 17:52 UTCEPSS rescore
  25. 2026-06-18 17:52 UTCEPSS rescore
  26. 2026-06-18 07:30 UTCEG score recompute
  27. 2026-06-18 07:29 UTCGHSA enrichment
  28. 2026-06-17 17:53 UTCEPSS rescore
  29. 2026-06-17 04:03 UTCEG score recompute
  30. 2026-06-17 04:03 UTCGHSA enrichment
  31. 2026-06-16 17:52 UTCEPSS rescore
  32. 2026-06-16 01:43 UTCEG score recompute
  33. 2026-06-16 01:43 UTCGHSA enrichment
  34. 2026-06-15 17:49 UTCEPSS rescore
  35. 2026-06-14 23:22 UTCEG score recompute
  36. 2026-06-14 23:22 UTCGHSA enrichment
  37. 2026-06-14 23:18 UTCEPSS rescore
  38. 2026-06-13 23:00 UTCEPSS rescore
  39. 2026-06-13 21:01 UTCEG score recompute
  40. 2026-06-13 21:01 UTCGHSA enrichment
  41. 2026-06-12 23:12 UTCEPSS rescore
  42. 2026-06-12 23:12 UTCEPSS rescore
  43. 2026-06-12 18:40 UTCEG score recompute
  44. 2026-06-12 18:40 UTCGHSA enrichment
  45. 2026-06-11 16:20 UTCEG score recompute
  46. 2026-06-11 16:19 UTCGHSA enrichment
  47. 2026-06-11 14:00 UTCEPSS rescore
  48. 2026-06-10 22:18 UTCEPSS rescore
  49. 2026-06-10 13:55 UTCEG score recompute
  50. 2026-06-10 13:55 UTCGHSA enrichment
  51. 2026-06-10 13:22 UTCEPSS rescore
  52. 2026-06-09 11:34 UTCEG score recompute
  53. 2026-06-09 11:34 UTCGHSA enrichment
  54. 2026-06-08 14:17 UTCEPSS rescore
  55. 2026-06-08 14:17 UTCEPSS rescore
  56. 2026-06-08 09:14 UTCEG score recompute▲ 6.50
  57. 2026-06-08 09:14 UTCGHSA enrichment
  58. 2026-06-07 15:25 UTCEPSS rescore
  59. 2026-06-07 15:25 UTCEPSS rescore
  60. 2026-06-07 15:25 UTCEPSS rescore
  61. 2026-06-06 13:47 UTCEPSS rescore
  62. 2026-06-06 13:47 UTCEPSS rescore
  63. 2026-06-05 14:42 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-37737?
CVE-2026-37737 is a medium vulnerability published on June 5, 2026. sanic-cors version 2.2.0 and prior contains an improper regular expression in the trymatch() function in saniccors/core.py that uses re.match without end-anchoring. This allows an attacker to bypass CORS origin allowlists by registering a domain that begins with a trusted origin string, to gain…
When was CVE-2026-37737 disclosed?
CVE-2026-37737 was first published in the National Vulnerability Database on June 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-37737 actively exploited?
CVE-2026-37737 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-37737?
CVE-2026-37737 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-37737?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-37737, 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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