CVE-2026-15996

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory published 2026-08-05. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
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: 0.8%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A denial of service vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to cause excessive CPU consumption and exhaust the pool of request-handling worker processes by sending a crafted form-encoded HTTP POST request containing deeply nested parameters. Because request parameters were parsed before routing and authentication, any POST endpoint could be used to trigger the condition, which could render the instance unresponsive. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.3, 3.19.7, 3.18.10, and 3.17.16.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.8%
EPSS %ILE
53rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 5, 2026

Last Modified

August 18, 2026

Advisory Details (4)

Auto-updated Aug 5, 2026
Fix named in the CVE record.
generic

Release notes - GitHub Enterprise Server 3.20 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.20.3
generic

Release notes - GitHub Enterprise Server 3.19 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.19.7
generic

Release notes - GitHub Enterprise Server 3.18 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.18.10
generic

Release notes - GitHub Enterprise Server 3.17 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.17.16

Vendor Advisories for CVE-2026-15996(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 17× in last 7d / 84× 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 188 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-15996?
CVE-2026-15996 is a high vulnerability published on August 5, 2026. A denial of service vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to cause excessive CPU consumption and exhaust the pool of request-handling worker processes by sending a crafted form-encoded HTTP POST request containing deeply nested parameters.…
When was CVE-2026-15996 disclosed?
CVE-2026-15996 was first published on August 5, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15996 actively exploited?
CVE-2026-15996 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (53rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-15996?
CVE-2026-15996 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-15996?
A fix for CVE-2026-15996 is available — its CVE record says: "This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.3, 3.19.7, 3.18.10, and 3.17.16." The vendor advisories EchelonGraph has for CVE-2026-15996 are linked in the Vendor Advisories panel on this page.

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