CVE-2026-11352

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
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server to trigger a remote denial of service against a curl or libcurl client. Because the helper function discards zero-length UDP datagrams before counting them toward the per-call packet budget, a connected QUIC peer can continuously stream empty datagrams to indefinitely stall the client.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

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%
Exploitation40% × 40%
Automatability100% × 15%
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

Published

July 3, 2026

Last Modified

September 15, 2026

Advisory Details (3)

Auto-updated Jul 7, 2026
Patch available.
generic

HackerOne

https://hackerone.com/reports/3783438
generic
https://curl.se/docs/CVE-2026-11352.json
generic

curl - QUIC zero-length UDP datagrams busy-loop - CVE-2026-11352

https://curl.se/docs/CVE-2026-11352.html

Vendor Advisories for CVE-2026-11352(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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibcurl4-openssl-dev (7.68.0-1ubuntu2.25+esm5) @ focal2026-09-23ubuntu
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 rangeFix by version rangeDependents
curl—
  • 8.18.0 up to 8.22.0-r0: fixed in 8.22.0-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
curl—
  • 8.18.0 up to 8.21.0-r0: fixed in 8.21.0-r0
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
curl8.14.1-2 ... 8.21.0~rc1-1+exp1 (59 versions)
  • every version up to 8.21.0~rc2-1: fixed in 8.21.0~rc2-1
—

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 7× in last 7d / 41× 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 315 total refreshes for this CVE.

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

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

Frequently asked(5)

What is CVE-2026-11352?
CVE-2026-11352 is a high vulnerability published on July 3, 2026. An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server to trigger a remote denial of service against a curl or libcurl client. Because the helper function discards zero-length UDP datagrams before counting them toward the per-call packet budget, a connected QUIC peer can…
When was CVE-2026-11352 disclosed?
CVE-2026-11352 was first published 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-2026-11352 actively exploited?
CVE-2026-11352 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-11352?
CVE-2026-11352 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-11352?
A fix for CVE-2026-11352 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-11352 are linked in the Vendor Advisories panel on this page.

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