CVE-2026-9375

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH 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
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 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(high)
EPSS
22.2%
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 33× in last 7d / 82× 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. 2026-07-07 01:04 UTCEG score recompute
  2. 2026-07-07 01:04 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 12:36 UTCEG score recompute
  5. 2026-07-06 12:36 UTCGHSA enrichment
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-06 00:10 UTCEG score recompute
  8. 2026-07-06 00:10 UTCGHSA enrichment
  9. 2026-07-05 11:42 UTCEG score recompute
  10. 2026-07-05 11:42 UTCGHSA enrichment
  11. 2026-07-05 02:31 UTCEPSS rescore
  12. 2026-07-04 23:15 UTCEG score recompute
  13. 2026-07-04 23:15 UTCGHSA enrichment
  14. 2026-07-04 10:47 UTCEG score recompute
  15. 2026-07-04 10:47 UTCGHSA enrichment
  16. 2026-07-04 06:31 UTCEPSS rescore
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-03 22:17 UTCEG score recompute
  19. 2026-07-03 22:17 UTCGHSA enrichment
  20. 2026-07-03 09:49 UTCEG score recompute
  21. 2026-07-03 09:48 UTCGHSA enrichment
  22. 2026-07-02 21:21 UTCEG score recompute
  23. 2026-07-02 21:20 UTCGHSA enrichment
  24. 2026-07-02 08:53 UTCEG score recompute
  25. 2026-07-02 08:53 UTCGHSA enrichment
Show 57 more
  1. 2026-07-01 20:25 UTCEG score recompute
  2. 2026-07-01 20:25 UTCGHSA enrichment
  3. 2026-07-01 15:07 UTCEPSS rescore
  4. 2026-07-01 07:58 UTCEG score recompute
  5. 2026-07-01 07:58 UTCGHSA enrichment
  6. 2026-06-30 23:22 UTCEPSS rescore
  7. 2026-06-30 19:31 UTCEG score recompute
  8. 2026-06-30 19:31 UTCGHSA enrichment
  9. 2026-06-30 07:03 UTCEG score recompute
  10. 2026-06-30 07:03 UTCGHSA enrichment
  11. 2026-06-29 18:35 UTCEG score recompute
  12. 2026-06-29 18:35 UTCGHSA enrichment
  13. 2026-06-29 14:06 UTCEPSS rescore
  14. 2026-06-29 06:08 UTCEG score recompute
  15. 2026-06-29 06:08 UTCGHSA enrichment
  16. 2026-06-28 17:41 UTCEG score recompute
  17. 2026-06-28 17:41 UTCGHSA enrichment
  18. 2026-06-28 14:07 UTCEPSS rescore
  19. 2026-06-28 05:13 UTCEG score recompute
  20. 2026-06-28 05:13 UTCGHSA enrichment
  21. 2026-06-28 04:56 UTCEPSS rescore
  22. 2026-06-27 16:46 UTCEG score recompute
  23. 2026-06-27 16:45 UTCGHSA enrichment
  24. 2026-06-27 04:17 UTCEG score recompute
  25. 2026-06-27 04:17 UTCGHSA enrichment
  26. 2026-06-27 03:08 UTCEPSS rescore
  27. 2026-06-26 15:50 UTCEG score recompute
  28. 2026-06-26 15:50 UTCGHSA enrichment
  29. 2026-06-26 03:23 UTCEG score recompute
  30. 2026-06-26 03:23 UTCGHSA enrichment
  31. 2026-06-25 14:56 UTCEG score recompute
  32. 2026-06-25 14:56 UTCGHSA enrichment
  33. 2026-06-25 13:50 UTCEPSS rescore
  34. 2026-06-25 02:28 UTCEG score recompute
  35. 2026-06-25 02:28 UTCGHSA enrichment
  36. 2026-06-24 14:05 UTCEPSS rescore
  37. 2026-06-24 14:01 UTCEG score recompute
  38. 2026-06-24 14:01 UTCGHSA enrichment
  39. 2026-06-24 01:33 UTCEG score recompute
  40. 2026-06-24 01:33 UTCGHSA enrichment
  41. 2026-06-23 21:33 UTCEPSS rescore
  42. 2026-06-23 13:05 UTCEG score recompute
  43. 2026-06-23 13:05 UTCGHSA enrichment
  44. 2026-06-23 00:36 UTCEG score recompute
  45. 2026-06-23 00:36 UTCGHSA enrichment
  46. 2026-06-22 12:07 UTCEG score recompute
  47. 2026-06-22 12:07 UTCGHSA enrichment
  48. 2026-06-21 23:34 UTCEG score recompute
  49. 2026-06-21 23:34 UTCGHSA enrichment
  50. 2026-06-21 11:05 UTCEG score recompute
  51. 2026-06-21 11:04 UTCGHSA enrichment
  52. 2026-06-20 22:35 UTCEG score recompute
  53. 2026-06-20 22:35 UTCGHSA enrichment
  54. 2026-06-20 10:08 UTCEG score recompute
  55. 2026-06-20 10:07 UTCGHSA enrichment
  56. 2026-06-19 21:37 UTCEG score recompute
  57. 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 22.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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

Explore the affected products and dependency analysis for CVE-2026-9375

Explore →

Is Your Infrastructure Affected by CVE-2026-9375?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs