CVE-2026-45300

HIGHPre-NVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 76% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
7.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.4Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Versions on the 2.x branch prior to 2.15.0 and the 3.x branch prior to 3.0.10 leak Cookie headers to cross-origin redirect targets. When following a redirect to a different origin, the propagatedHeaders() method in Redirect30xInterceptor.java strips Authorization and Proxy-Authorization headers but does not strip the Cookie header, causing session cookies and other sensitive cookie values to be sent to attacker-controlled servers. Versions 2.15.0 and 3.0.10 patch the issue.

CVSS v3
7.4
EG Score
7.4(medium)
EPSS
24.1%
KEV
Not listed

Published

May 18, 2026

Last Modified

June 8, 2026

Advisory Details (3)

Auto-updated Jun 9, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
github Patch Available🟡 PoC Available

Cookie header not stripped on cross-origin redirect · Advisory · AsyncHttpClient/async-http-client · GitHub

https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-fmxf-pm6p-7xgm
github_release Patch Available

AHC v3.0.10 Release

Patch available: AsyncHttpClient/async-http-client async-http-client-project-3.0.10

https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.10
github_commit Patch Available

commit 3b0e3e9e (AsyncHttpClient/async-http-client)

Patch available: AsyncHttpClient/async-http-client async-http-client-project-3.0.10 (contains commit 3b0e3e9e)

https://github.com/AsyncHttpClient/async-http-client/commit/3b0e3e9e

Vendor Advisories for CVE-2026-45300(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.asynchttpclient:async-http-client2.0.0 ... 2.9.0 (110 versions)2.15.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 52× 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. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:10 UTCEPSS rescore
  4. 2026-07-08 15:16 UTCEPSS rescore
  5. 2026-07-07 13:46 UTCEPSS rescore
  6. 2026-07-06 16:27 UTCEPSS rescore
  7. 2026-07-06 02:23 UTCEPSS rescore
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  9. 2026-07-04 06:31 UTCEPSS rescore
  10. 2026-07-01 15:07 UTCEPSS rescore
  11. 2026-06-30 23:22 UTCEPSS rescore
  12. 2026-06-29 21:09 UTCEG score recompute
  13. 2026-06-29 14:06 UTCEPSS rescore
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  15. 2026-06-28 14:07 UTCEPSS rescore
  16. 2026-06-28 08:40 UTCEG score recompute
  17. 2026-06-28 04:56 UTCEPSS rescore
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  19. 2026-06-27 21:22 UTCEG score recompute
  20. 2026-06-27 07:44 UTCEG score recompute
  21. 2026-06-27 03:08 UTCEPSS rescore
  22. 2026-06-26 19:56 UTCEG score recompute
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  24. 2026-06-25 17:45 UTCEG score recompute
  25. 2026-06-25 13:49 UTCEPSS rescore
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  1. 2026-06-24 14:05 UTCEPSS rescore
  2. 2026-06-23 21:33 UTCEPSS rescore
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  4. 2026-06-22 14:25 UTCEPSS rescore
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  6. 2026-06-21 14:56 UTCEPSS rescore
  7. 2026-06-21 14:56 UTCEPSS rescore
  8. 2026-06-21 01:59 UTCEPSS rescore
  9. 2026-06-19 19:25 UTCEPSS rescore
  10. 2026-06-18 17:52 UTCEPSS rescore
  11. 2026-06-18 17:52 UTCEPSS rescore
  12. 2026-06-18 02:21 UTCEG score recompute
  13. 2026-06-17 17:53 UTCEPSS rescore
  14. 2026-06-17 13:15 UTCEG score recompute
  15. 2026-06-16 22:08 UTCEG score recompute
  16. 2026-06-16 17:52 UTCEPSS rescore
  17. 2026-06-16 10:54 UTCEG score recompute
  18. 2026-06-15 23:11 UTCEG score recompute
  19. 2026-06-15 17:49 UTCEPSS rescore
  20. 2026-06-15 00:37 UTCEG score recompute
  21. 2026-06-14 13:23 UTCEG score recompute
  22. 2026-06-14 02:09 UTCEG score recompute
  23. 2026-06-13 23:00 UTCEPSS rescore
  24. 2026-06-13 14:54 UTCEG score recompute
  25. 2026-06-13 00:44 UTCEG score recompute
  26. 2026-06-12 23:12 UTCEPSS rescore
  27. 2026-06-12 23:12 UTCEPSS rescore
  28. 2026-06-12 13:30 UTCEG score recompute
  29. 2026-06-12 02:15 UTCEG score recompute
  30. 2026-06-11 15:01 UTCEG score recompute
  31. 2026-06-11 14:00 UTCEPSS rescore
  32. 2026-06-11 03:47 UTCEG score recompute
  33. 2026-06-10 22:18 UTCEPSS rescore
  34. 2026-06-10 16:33 UTCEG score recompute
  35. 2026-06-10 13:22 UTCEPSS rescore
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  37. 2026-06-10 05:19 UTCEG score recompute
  38. 2026-06-09 18:06 UTCEG score recompute
  39. 2026-06-09 06:52 UTCEG score recompute
  40. 2026-06-08 19:38 UTCEG score recompute
  41. 2026-06-08 14:17 UTCEPSS rescore
  42. 2026-06-08 14:17 UTCEPSS rescore
  43. 2026-06-08 05:48 UTCEG score recompute
  44. 2026-06-07 18:35 UTCEG score recompute
  45. 2026-06-07 15:25 UTCEPSS rescore
  46. 2026-06-07 15:25 UTCEPSS rescore
  47. 2026-06-07 07:20 UTCEG score recompute
  48. 2026-06-06 20:06 UTCEG score recompute
  49. 2026-06-06 13:47 UTCEPSS rescore
  50. 2026-06-06 13:47 UTCEPSS rescore
  51. 2026-06-06 08:51 UTCEG score recompute
  52. 2026-06-05 21:37 UTCEG score recompute
  53. 2026-06-05 10:22 UTCEG score recompute
  54. 2026-06-04 23:09 UTCEG score recompute
  55. 2026-06-04 11:55 UTCEG score recompute
  56. 2026-06-04 00:41 UTCEG score recompute
  57. 2026-06-03 13:27 UTCEG score recompute
  58. 2026-06-03 02:11 UTCEG score recompute
  59. 2026-06-02 14:57 UTCEG score recompute
  60. 2026-06-02 03:43 UTCEG score recompute
  61. 2026-06-01 16:29 UTCEG score recompute
  62. 2026-06-01 05:15 UTCEG score recompute
  63. 2026-05-24 06:17 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-45300?
CVE-2026-45300 is a high vulnerability published on May 18, 2026. The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Versions on the 2.x branch prior to 2.15.0 and the 3.x branch prior to 3.0.10 leak Cookie headers to cross-origin redirect targets. When following a redirect to a…
When was CVE-2026-45300 disclosed?
CVE-2026-45300 was first published in the National Vulnerability Database on May 18, 2026, with the most recent update on June 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45300 actively exploited?
CVE-2026-45300 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45300?
CVE-2026-45300 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-45300?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45300, 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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