CVE-2026-9375

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-19. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

urllib3 version 2.6.3 is vulnerable to a decompression bomb bypass in its streaming API (preload_content=False) when using Brotli support. The issue arises due to three independent code paths in response.py that bypass the max_length protection introduced in version 2.6.0 to mitigate CVE-2025-66471. Specifically, negative max_length values can be produced due to buffer arithmetic in read(), flush_decoder unconditionally overrides max_length to -1, and _flush_decoder() passes no limit at all, defaulting to unlimited decompression. This allows a malicious HTTP server to trigger an out-of-memory (OOM) condition by decompressing large payloads into memory, leading to a denial of service (DoS). The vulnerability affects urllib3 2.6.3 and Brotli 1.2.0 and impacts applications and libraries using requests or urllib3 to stream content from untrusted sources.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

June 19, 2026

Last Modified

June 22, 2026

Advisory Details (2)

Auto-updated Jun 22, 2026
Patch available. Sources: github_commit.
generic

huntr - The world's first bug bounty platform for AI/ML

https://huntr.com/bounties/ddd09eb9-b87d-4a43-84df-48837b1bbc23
github_commit Patch Available

commit 2bdcc44d1e16 (urllib3/urllib3)

Patch available: urllib3/urllib3 2.7.0 (contains commit 2bdcc44d1e16)

https://github.com/urllib3/urllib3/commit/2bdcc44d1e163fb5cc48a8662425e35e15adfe6a

Vendor Advisories for CVE-2026-9375(1)

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-9375?
CVE-2026-9375 is a high vulnerability published on June 19, 2026. urllib3 version 2.6.3 is vulnerable to a decompression bomb bypass in its streaming API (preloadcontent=False) when using Brotli support. The issue arises due to three independent code paths in response.py that bypass the maxlength protection introduced in version 2.6.0 to mitigate CVE-2025-66471.…
When was CVE-2026-9375 disclosed?
CVE-2026-9375 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on June 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9375 actively exploited?
CVE-2026-9375 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 77.4% of all scored CVEs.
What is the CVSS score of CVE-2026-9375?
CVE-2026-9375 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-9375?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9375, 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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