CVE-2026-9375

✕ Withdrawn — historical dataHIGHPre-NVD 7.5
7.5CVSS
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
EchelonGraph score
Not yet assessedThis CVE record was withdrawn by its numbering authority, so there is no vulnerability to rate.
EG Score
—
EG Risk
—
EPSS PROB
0.3%
EPSS %ILE
22nd
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

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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(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
python-urllib31.26.12-1 ... 2.7.0-3 (29 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
python-urllib31.26.12-1 ... 2.7.0-3 (26 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
python-urllib32.3.0-3 ... 2.7.0-3 (11 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
python-urllib32.3.0-3 ... 2.6.3-2 (6 versions)
  • every version up to 2.7.0-1: fixed in 2.7.0-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 1× in last 7d / 2× 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 168 total refreshes for this CVE.

  1. 2026-10-02 15:10 UTCOSV refresh
  2. 2026-09-13 13:00 UTCGHSA enrichment
  3. 2026-08-30 20:45 UTCGHSA enrichment
  4. 2026-08-23 11:07 UTCGHSA enrichment
  5. 2026-08-20 07:59 UTCGHSA enrichment
  6. 2026-08-17 04:18 UTCGHSA enrichment
  7. 2026-08-14 01:09 UTCEG score recompute▼ 7.50
  8. 2026-08-14 01:09 UTCGHSA enrichment
  9. 2026-08-13 22:00 UTCEPSS rescore
  10. 2026-08-13 12:42 UTCGHSA enrichment
  11. 2026-08-13 00:02 UTCEG score recompute
  12. 2026-08-13 00:02 UTCGHSA enrichment
  13. 2026-08-12 13:51 UTCEPSS rescore
  14. 2026-08-12 11:36 UTCGHSA enrichment
  15. 2026-08-11 23:09 UTCEG score recompute
  16. 2026-08-11 23:09 UTCGHSA enrichment
  17. 2026-08-11 13:43 UTCEPSS rescore
  18. 2026-08-11 10:42 UTCEG score recompute
  19. 2026-08-11 10:42 UTCGHSA enrichment
  20. 2026-08-11 00:00 UTCEPSS rescore
  21. 2026-08-10 22:15 UTCGHSA enrichment
  22. 2026-08-10 09:47 UTCGHSA enrichment
  23. 2026-08-09 21:21 UTCEG score recompute
  24. 2026-08-09 21:21 UTCGHSA enrichment
  25. 2026-08-09 13:47 UTCEPSS rescore
Show 75 more
  1. 2026-08-09 08:54 UTCGHSA enrichment
  2. 2026-08-08 20:27 UTCEG score recompute
  3. 2026-08-08 20:27 UTCGHSA enrichment
  4. 2026-08-08 16:37 UTCEPSS rescore
  5. 2026-08-08 07:59 UTCGHSA enrichment
  6. 2026-08-07 19:32 UTCEG score recompute
  7. 2026-08-07 19:32 UTCGHSA enrichment
  8. 2026-08-07 16:30 UTCEPSS rescore
  9. 2026-08-07 07:05 UTCGHSA enrichment
  10. 2026-08-06 18:38 UTCEG score recompute
  11. 2026-08-06 18:38 UTCGHSA enrichment
  12. 2026-08-06 13:47 UTCEPSS rescore
  13. 2026-08-06 06:11 UTCEG score recompute
  14. 2026-08-06 06:11 UTCGHSA enrichment
  15. 2026-08-05 19:17 UTCEPSS rescore
  16. 2026-08-05 19:17 UTCEPSS rescore
  17. 2026-08-05 17:45 UTCGHSA enrichment
  18. 2026-08-05 03:59 UTCGHSA enrichment
  19. 2026-08-04 15:33 UTCEG score recompute
  20. 2026-08-04 15:32 UTCGHSA enrichment
  21. 2026-08-04 15:10 UTCEPSS rescore
  22. 2026-08-04 10:39 UTCEPSS rescore
  23. 2026-08-04 03:06 UTCGHSA enrichment
  24. 2026-08-03 14:38 UTCEG score recompute
  25. 2026-08-03 14:38 UTCGHSA enrichment
  26. 2026-08-03 10:36 UTCEPSS rescore
  27. 2026-08-03 02:11 UTCGHSA enrichment
  28. 2026-08-02 13:44 UTCEG score recompute
  29. 2026-08-02 13:44 UTCGHSA enrichment
  30. 2026-08-02 02:27 UTCEPSS rescore
  31. 2026-08-02 01:16 UTCGHSA enrichment
  32. 2026-08-01 12:49 UTCEG score recompute
  33. 2026-08-01 12:49 UTCGHSA enrichment
  34. 2026-08-01 04:16 UTCEPSS rescore
  35. 2026-08-01 00:21 UTCGHSA enrichment
  36. 2026-07-31 11:51 UTCGHSA enrichment
  37. 2026-07-30 22:17 UTCEG score recompute
  38. 2026-07-30 22:16 UTCGHSA enrichment
  39. 2026-07-30 16:28 UTCEPSS rescore
  40. 2026-07-30 02:53 UTCEG score recompute
  41. 2026-07-30 02:53 UTCGHSA enrichment
  42. 2026-07-30 01:30 UTCEPSS rescore
  43. 2026-07-29 14:00 UTCGHSA enrichment
  44. 2026-07-29 01:33 UTCEG score recompute
  45. 2026-07-29 01:33 UTCGHSA enrichment
  46. 2026-07-28 15:37 UTCEPSS rescore
  47. 2026-07-28 09:49 UTCGHSA enrichment
  48. 2026-07-27 21:17 UTCEG score recompute
  49. 2026-07-27 21:17 UTCGHSA enrichment
  50. 2026-07-27 14:14 UTCEPSS rescore
  51. 2026-07-27 06:40 UTCGHSA enrichment
  52. 2026-07-26 16:47 UTCEG score recompute
  53. 2026-07-26 16:47 UTCGHSA enrichment
  54. 2026-07-26 14:54 UTCEPSS rescore
  55. 2026-07-25 14:18 UTCEPSS rescore
  56. 2026-07-24 14:18 UTCEPSS rescore
  57. 2026-07-23 14:18 UTCEPSS rescore
  58. 2026-07-23 03:23 UTCEG score recompute
  59. 2026-07-22 14:08 UTCEPSS rescore
  60. 2026-07-21 15:25 UTCEPSS rescore
  61. 2026-07-21 15:25 UTCEPSS rescore
  62. 2026-07-20 17:08 UTCEPSS rescore
  63. 2026-07-19 14:31 UTCEPSS rescore
  64. 2026-07-19 02:29 UTCEPSS rescore
  65. 2026-07-18 10:04 UTCEPSS rescore
  66. 2026-07-16 23:48 UTCGHSA enrichment
  67. 2026-07-16 17:03 UTCEPSS rescore
  68. 2026-07-16 11:21 UTCGHSA enrichment
  69. 2026-07-15 22:16 UTCGHSA enrichment
  70. 2026-07-15 16:57 UTCEPSS rescore
  71. 2026-07-15 09:48 UTCGHSA enrichment
  72. 2026-07-15 02:00 UTCEPSS rescore
  73. 2026-07-14 21:21 UTCGHSA enrichment
  74. 2026-07-14 08:54 UTCGHSA enrichment
  75. 2026-07-13 22:31 UTCEPSS rescore

Related CVEs(same product + 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 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 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-9375?
CVE-2026-9375 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-9375?
A fix for CVE-2026-9375 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-9375 are linked in the Vendor Advisories panel on this page.

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