CVE-2026-10536

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via CURLOPT_STREAM_DEPENDS or CURLOPT_STREAM_DEPENDS_E, subsequently invokes curl_easy_reset(), and finally terminates the handle with curl_easy_cleanup(). During this final cleanup phase, libcurl attempts to access and modify an internal structure that was already freed during the reset operation.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
57%
KEV
Not listed

Published

July 3, 2026

Last Modified

July 7, 2026

Advisory Details (3)

Auto-updated Aug 30, 2026
No patch confirmed yet.
generic

HackerOne

https://hackerone.com/reports/3751697
generic
https://curl.se/docs/CVE-2026-10536.json
generic

curl - HTTP/2 stream-dependency tree UAF - CVE-2026-10536

https://curl.se/docs/CVE-2026-10536.html

Vendor Advisories for CVE-2026-10536(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 (8.5.0-2ubuntu10.11) @ noble2026-08-31ubuntu
redhatlibcurl-1.dll2026-08-19redhat
redhatcurl-main-8.21.0-0.1.1.hum12026-07-17redhat

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

(4 across 4 ecosystems)
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
curl—8.21.0-r0—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
curl7.88.1-10 ... 8.9.1-2~bpo12+1 (174 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
curl8.14.1-2 ... 8.21.0~rc3-1+exp1 (74 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
curl8.14.1-2 ... 8.21.0~rc1-1+exp1 (59 versions)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 37× in last 7d / 342× 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 542 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-10536?
CVE-2026-10536 is a critical vulnerability published on July 3, 2026. A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via CURLOPTSTREAMDEPENDS or CURLOPTSTREAMDEPENDSE, subsequently invokes curleasy_reset(), and finally terminates the handle with curleasycleanup(). During this final cleanup phase,…
When was CVE-2026-10536 disclosed?
CVE-2026-10536 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-2026-10536 actively exploited?
CVE-2026-10536 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 43.1% of all scored CVEs.
What is the CVSS score of CVE-2026-10536?
CVE-2026-10536 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-10536?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-10536, 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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