CVE-2026-11586

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 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

A fix is available — apply it.

By default, curl automatically responds to WebSocket PING frames. Because curl lacks an upper bound on memory allocation for unacknowledged frames, a malicious server can exhaust all available memory by flooding curl with rapid, sequential PING messages.

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
48%
KEV
Not listed

Published

July 3, 2026

Last Modified

September 15, 2026

Advisory Details (3)

Auto-updated Jul 6, 2026
No patch confirmed yet.
generic

HackerOne

https://hackerone.com/reports/3788931
generic

curl - WS Auto-PONG memory exhaustion - CVE-2026-11586

https://curl.se/docs/CVE-2026-11586.html
generic
https://curl.se/docs/CVE-2026-11586.json

Vendor Advisories for CVE-2026-11586(3)

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
ubuntulibcurl4-openssl-dev (7.35.0-1ubuntu2.20+esm21) @ trusty2026-09-18ubuntu
redhatrust-main-1.96.1-1.hum12026-07-02redhat
redhatcurl-main-8.21.0-0.1.hum12026-06-24redhat

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

(3 across 3 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
curl—8.22.0-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
curl—8.21.0-r0—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
curl8.14.1-2 ... 8.21.0~rc2-1+exp1 (61 versions)8.21.0~rc3-1—

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 17× 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.

Showing the most recent 100 of 285 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-11586?
CVE-2026-11586 is a high vulnerability published on July 3, 2026. By default, curl automatically responds to WebSocket PING frames. Because curl lacks an upper bound on memory allocation for unacknowledged frames, a malicious server can exhaust all available memory by flooding curl with rapid, sequential PING messages.
When was CVE-2026-11586 disclosed?
CVE-2026-11586 was first published in the National Vulnerability Database on July 3, 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-2026-11586 actively exploited?
CVE-2026-11586 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 52.3% of all scored CVEs.
What is the CVSS score of CVE-2026-11586?
CVE-2026-11586 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-11586?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-11586, 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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