CVE-2026-18924

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-06. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this weekElevated
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: Elevated riskExposed: 0

A fix is available — apply it.

A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent handle is set to share connections with other handles, can lead to use-after-free in the cleanup process.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
72(Attend)
EG Risk 72/100SSVC: Attend

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
Severity91% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

September 6, 2026

Last Modified

September 15, 2026

Advisory Details (3)

Auto-updated Sep 15, 2026
No patch confirmed yet.
generic

HackerOne

https://hackerone.com/reports/3916059
generic
https://curl.se/docs/CVE-2026-18924.json
generic

curl - HTTP/2 server push UAF - CVE-2026-18924

https://curl.se/docs/CVE-2026-18924.html

Vendor Advisories for CVE-2026-18924(4)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibcurl4t64 (8.5.0-2ubuntu10.15) @ noble2026-09-25ubuntu
redhatrust-main-1.98.0-1.hum12026-09-04redhat
redhatcurl-main-8.22.0-0.1.hum12026-09-03redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
curl—8.22.0-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
curl—8.22.0-r0—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
curl7.88.1-10 ... 8.9.1-2~bpo12+1 (179 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
curl8.14.1-2 ... 8.22.0~rc3-1+exp1 (79 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
curl8.14.1-2 ... 8.22.0~rc3-1+exp1 (73 versions)——

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 98× in last 7d / 244× 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 244 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-18924?
CVE-2026-18924 is a critical vulnerability published on September 6, 2026. A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent handle is set to share connections with other handles, can lead to use-after-free in the cleanup process.
When was CVE-2026-18924 disclosed?
CVE-2026-18924 was first published in the National Vulnerability Database on September 6, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18924 actively exploited?
CVE-2026-18924 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 54.5% of all scored CVEs.
What is the CVSS score of CVE-2026-18924?
CVE-2026-18924 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-18924?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18924, 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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