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
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 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)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
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.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
pipsanic-cors—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
sanic-cors0.10.0 ... 2.2.0b1 (38 versions)——

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 51× 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. 2026-07-26 21:57 UTCEG score recompute
  2. 2026-07-26 21:57 UTCGHSA enrichment
  3. 2026-07-26 14:54 UTCEPSS rescore
  4. 2026-07-26 14:54 UTCEPSS rescore
  5. 2026-07-25 14:18 UTCEPSS rescore
  6. 2026-07-25 14:18 UTCEPSS rescore
  7. 2026-07-24 14:17 UTCEPSS rescore
  8. 2026-07-24 14:17 UTCEPSS rescore
  9. 2026-07-23 14:18 UTCEPSS rescore
  10. 2026-07-23 14:18 UTCEPSS rescore
  11. 2026-07-23 03:10 UTCEG score recompute
  12. 2026-07-22 14:08 UTCEPSS rescore
  13. 2026-07-21 15:24 UTCEPSS rescore
  14. 2026-07-20 17:08 UTCEPSS rescore
  15. 2026-07-19 14:31 UTCEPSS rescore
  16. 2026-07-19 02:29 UTCEPSS rescore
  17. 2026-07-18 10:04 UTCEPSS rescore
  18. 2026-07-16 17:03 UTCEPSS rescore
  19. 2026-07-15 22:53 UTCGHSA enrichment
  20. 2026-07-15 16:57 UTCEPSS rescore
  21. 2026-07-15 16:57 UTCEPSS rescore
  22. 2026-07-15 02:00 UTCEPSS rescore
  23. 2026-07-14 03:07 UTCGHSA enrichment
  24. 2026-07-13 22:30 UTCEPSS rescore
  25. 2026-07-13 06:13 UTCEPSS rescore
Show 75 more
  1. 2026-07-13 06:13 UTCEPSS rescore
  2. 2026-07-12 12:36 UTCGHSA enrichment
  3. 2026-07-12 05:46 UTCEPSS rescore
  4. 2026-07-11 08:27 UTCEPSS rescore
  5. 2026-07-11 05:21 UTCGHSA enrichment
  6. 2026-07-09 19:10 UTCEPSS rescore
  7. 2026-07-09 10:28 UTCGHSA enrichment
  8. 2026-07-08 15:15 UTCEPSS rescore
  9. 2026-07-08 07:56 UTCGHSA enrichment
  10. 2026-07-07 13:46 UTCEPSS rescore
  11. 2026-07-06 16:27 UTCEPSS rescore
  12. 2026-07-06 16:27 UTCEPSS rescore
  13. 2026-07-05 23:48 UTCGHSA enrichment
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-04 20:55 UTCGHSA enrichment
  16. 2026-07-04 06:31 UTCEPSS rescore
  17. 2026-07-03 16:56 UTCGHSA enrichment
  18. 2026-07-02 01:08 UTCGHSA enrichment
  19. 2026-07-01 15:06 UTCEPSS rescore
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 22:35 UTCGHSA enrichment
  22. 2026-06-29 14:06 UTCEPSS rescore
  23. 2026-06-28 17:52 UTCGHSA enrichment
  24. 2026-06-28 14:07 UTCEPSS rescore
  25. 2026-06-28 04:56 UTCEPSS rescore
  26. 2026-06-27 15:31 UTCGHSA enrichment
  27. 2026-06-27 03:08 UTCEPSS rescore
  28. 2026-06-26 13:10 UTCGHSA enrichment
  29. 2026-06-25 13:49 UTCEPSS rescore
  30. 2026-06-25 13:49 UTCEPSS rescore
  31. 2026-06-25 04:05 UTCGHSA enrichment
  32. 2026-06-24 14:05 UTCEPSS rescore
  33. 2026-06-24 01:41 UTCGHSA enrichment
  34. 2026-06-23 21:33 UTCEPSS rescore
  35. 2026-06-22 23:19 UTCGHSA enrichment
  36. 2026-06-22 14:25 UTCEPSS rescore
  37. 2026-06-22 14:25 UTCEPSS rescore
  38. 2026-06-21 14:56 UTCEPSS rescore
  39. 2026-06-21 14:56 UTCEPSS rescore
  40. 2026-06-21 01:59 UTCEPSS rescore
  41. 2026-06-20 14:48 UTCGHSA enrichment
  42. 2026-06-19 19:25 UTCEPSS rescore
  43. 2026-06-19 19:25 UTCEPSS rescore
  44. 2026-06-19 12:19 UTCGHSA enrichment
  45. 2026-06-18 17:52 UTCEPSS rescore
  46. 2026-06-18 17:52 UTCEPSS rescore
  47. 2026-06-18 07:29 UTCGHSA enrichment
  48. 2026-06-17 17:53 UTCEPSS rescore
  49. 2026-06-17 04:03 UTCGHSA enrichment
  50. 2026-06-16 17:52 UTCEPSS rescore
  51. 2026-06-16 01:43 UTCGHSA enrichment
  52. 2026-06-15 17:49 UTCEPSS rescore
  53. 2026-06-14 23:22 UTCGHSA enrichment
  54. 2026-06-14 23:18 UTCEPSS rescore
  55. 2026-06-13 23:00 UTCEPSS rescore
  56. 2026-06-13 21:01 UTCGHSA enrichment
  57. 2026-06-12 23:12 UTCEPSS rescore
  58. 2026-06-12 23:12 UTCEPSS rescore
  59. 2026-06-12 18:40 UTCGHSA enrichment
  60. 2026-06-11 16:19 UTCGHSA enrichment
  61. 2026-06-11 14:00 UTCEPSS rescore
  62. 2026-06-10 22:18 UTCEPSS rescore
  63. 2026-06-10 13:55 UTCGHSA enrichment
  64. 2026-06-10 13:22 UTCEPSS rescore
  65. 2026-06-09 11:34 UTCGHSA enrichment
  66. 2026-06-08 14:17 UTCEPSS rescore
  67. 2026-06-08 14:17 UTCEPSS rescore
  68. 2026-06-08 09:14 UTCEG score recompute▲ 6.50
  69. 2026-06-08 09:14 UTCGHSA enrichment
  70. 2026-06-07 15:25 UTCEPSS rescore
  71. 2026-06-07 15:25 UTCEPSS rescore
  72. 2026-06-07 15:25 UTCEPSS rescore
  73. 2026-06-06 13:47 UTCEPSS rescore
  74. 2026-06-06 13:47 UTCEPSS rescore
  75. 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 0% probability of exploitation in the next 30 days, which ranks it in the top 94.0% of all scored CVEs.
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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