CVE-2026-44909

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-23. 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: 1%CVSS: 7.5Exploit: None knownExposed: 0

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

Proxygen lacked a generalized slow-consumer detection mechanism in its core HTTP session layer. A remote, unauthenticated attacker could exploit HTTP/2 flow-control by setting SETTINGS_INITIAL_WINDOW_SIZE to 0 or withholding WINDOW_UPDATE frames, causing the server to buffer complete response bodies in memory indefinitely for stalled streams. By opening many simultaneous streams requesting large resources while preventing the server from transmitting responses, an attacker could induce unbounded memory growth leading to service degradation, resource exhaustion, or denial of service. Versions v2017.01.16.00 through v2026.07.20.00 are affected.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

July 23, 2026

Last Modified

July 23, 2026

Advisory Details (1)

Auto-updated Jul 23, 2026
Patch available. Sources: github_commit.
github_commit Patch Available

commit f28742f21f70 (facebook/proxygen)

Patch available: facebook/proxygen v2026.07.20.00 (contains commit f28742f21f70)

https://github.com/facebook/proxygen/commit/f28742f21f7022c261b7620d4e6b20d82b6cff72

Vendor Advisories for CVE-2026-44909(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 112× 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 141 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-44909?
CVE-2026-44909 is a high vulnerability published on July 23, 2026. Proxygen lacked a generalized slow-consumer detection mechanism in its core HTTP session layer. A remote, unauthenticated attacker could exploit HTTP/2 flow-control by setting SETTINGSINITIALWINDOWSIZE to 0 or withholding WINDOWUPDATE frames, causing the server to buffer complete response bodies in…
When was CVE-2026-44909 disclosed?
CVE-2026-44909 was first published in the National Vulnerability Database on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44909 actively exploited?
CVE-2026-44909 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.2% of all scored CVEs.
What is the CVSS score of CVE-2026-44909?
CVE-2026-44909 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-44909?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44909, 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.

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