CVE-2026-8924

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-03. 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 curl’s cookie parsing logic allows a malicious HTTP server to set 'super cookies' that bypass the Public Suffix List check. This enables an attacker-controlled origin to inject cookies that curl subsequently scopes and transmits to unrelated third-party domains.

CVSS v3
9.1
EG Score
9.1(medium)
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
44%
KEV
Not listed

Published

July 3, 2026

Last Modified

July 7, 2026

Advisory Details (3)

Auto-updated Aug 1, 2026
No patch confirmed yet.
generic

HackerOne

https://hackerone.com/reports/3733905
generic
https://curl.se/docs/CVE-2026-8924.json
generic

curl - trailing dot domain super cookie - CVE-2026-8924

https://curl.se/docs/CVE-2026-8924.html

Vendor Advisories for CVE-2026-8924(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
ubuntulibcurl4-openssl-dev (7.81.0-1ubuntu1.25) @ jammy2026-08-21ubuntu
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

(5 across 5 ecosystems)
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
curl—8.21.0-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
curl7.74.0-1.3 ... 8.9.1-2~bpo12+1 (219 versions)——
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—

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 92× in last 7d / 367× 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 499 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-8924?
CVE-2026-8924 is a critical vulnerability published on July 3, 2026. A flaw in curl’s cookie parsing logic allows a malicious HTTP server to set 'super cookies' that bypass the Public Suffix List check. This enables an attacker-controlled origin to inject cookies that curl subsequently scopes and transmits to unrelated third-party domains.
When was CVE-2026-8924 disclosed?
CVE-2026-8924 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-2026-8924 actively exploited?
CVE-2026-8924 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 55.8% of all scored CVEs.
What is the CVSS score of CVE-2026-8924?
CVE-2026-8924 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-8924?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8924, 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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