CVE-2026-11586

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH 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 — 3 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 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(high)
EG Risk
—
EPSS
54.7%
KEV
Not listed

Published

July 3, 2026

Last Modified

July 7, 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
ubuntulibcurl4t64 (8.14.1-2ubuntu1.5) @ questing2026-07-16ubuntu
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.

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 11× in last 7d / 56× 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.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:24 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 14:30 UTCEPSS rescore
  5. 2026-07-19 02:28 UTCEPSS rescore
  6. 2026-07-18 10:04 UTCEPSS rescore
  7. 2026-07-17 00:36 UTCVendor advisory
  8. 2026-07-17 00:36 UTCGHSA enrichment
  9. 2026-07-16 17:02 UTCEPSS rescore
  10. 2026-07-16 11:58 UTCVendor advisory
  11. 2026-07-16 11:58 UTCGHSA enrichment
  12. 2026-07-15 23:19 UTCVendor advisory
  13. 2026-07-15 23:19 UTCGHSA enrichment
  14. 2026-07-15 16:57 UTCEPSS rescore
  15. 2026-07-15 10:41 UTCVendor advisory
  16. 2026-07-15 10:40 UTCGHSA enrichment
  17. 2026-07-15 02:00 UTCEPSS rescore
  18. 2026-07-14 21:55 UTCVendor advisory
  19. 2026-07-14 21:55 UTCGHSA enrichment
  20. 2026-07-14 09:16 UTCVendor advisory
  21. 2026-07-14 09:16 UTCGHSA enrichment
  22. 2026-07-13 22:30 UTCEPSS rescore
  23. 2026-07-13 20:37 UTCVendor advisory
  24. 2026-07-13 20:37 UTCGHSA enrichment
  25. 2026-07-13 07:58 UTCVendor advisory
Show 31 more
  1. 2026-07-13 07:58 UTCGHSA enrichment
  2. 2026-07-13 06:12 UTCEPSS rescore
  3. 2026-07-12 19:19 UTCVendor advisory
  4. 2026-07-12 19:19 UTCGHSA enrichment
  5. 2026-07-12 06:40 UTCVendor advisory
  6. 2026-07-12 06:40 UTCGHSA enrichment
  7. 2026-07-12 05:46 UTCEPSS rescore
  8. 2026-07-11 18:01 UTCVendor advisory
  9. 2026-07-11 18:00 UTCGHSA enrichment
  10. 2026-07-11 08:27 UTCEPSS rescore
  11. 2026-07-11 05:21 UTCVendor advisory
  12. 2026-07-11 05:21 UTCGHSA enrichment
  13. 2026-07-10 16:42 UTCVendor advisory
  14. 2026-07-10 16:42 UTCGHSA enrichment
  15. 2026-07-10 04:04 UTCVendor advisory
  16. 2026-07-10 04:04 UTCGHSA enrichment
  17. 2026-07-09 19:10 UTCEPSS rescore
  18. 2026-07-09 15:24 UTCEG score recompute▲ 7.50
  19. 2026-07-09 15:24 UTCVendor advisory
  20. 2026-07-09 15:24 UTCGHSA enrichment
  21. 2026-07-08 15:15 UTCEPSS rescore
  22. 2026-07-08 15:15 UTCEPSS rescore
  23. 2026-07-07 13:46 UTCEPSS rescore
  24. 2026-07-06 16:27 UTCEPSS rescore
  25. 2026-07-06 15:36 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  26. 2026-07-06 11:57 UTCGHSA enrichment
  27. 2026-07-06 02:23 UTCEPSS rescore
  28. 2026-07-05 02:30 UTCEPSS rescore
  29. 2026-07-05 02:30 UTCEPSS rescore
  30. 2026-07-03 08:29 UTCEG score recompute
  31. 2026-07-03 08:26 UTCNVD updatefirst tracked

Related CVEs(same vendor + same CWE)

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 July 7, 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 54.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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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