CVE-2026-48710

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 1.4%, top 30% 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: cna:github_m, epss
Elevated
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 6.5Exploit: NoneExposed: 0

A fix is available — apply it.

Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP Host request header was not validated before being used to reconstruct request.url. Because the routing algorithm relies on the raw HTTP path while request.url is rebuilt from the Host header, a malformed header could make request.url.path differ from the path that was actually requested. Middleware and endpoints that apply security restrictions based on request.url (rather than the raw scope path) could therefore be bypassed. Users should upgrade to a version greater than or equal to version 1.0.1, which validates the Host header against the grammar of RFC 9112 §3.2 / RFC 3986 §3.2.2 when constructing request.url and falls back to scope["server"] for malformed values.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
70.1%
KEV
Not listed

Published

May 26, 2026

Last Modified

July 15, 2026

Advisory Details (7)

Auto-updated Jun 15, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
generic🟡 PoC Available

Advisory X41-2026-002: Request Host Header not Validated in Starlette | X41 D-Sec - Penetration Tests and Source Code Audits

https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette
generic🟡 PoC Available

starlette - secwest.net - secure virtual engagement

https://www.secwest.net/starlette
generic

Disclosing the BADHOST Vulnerability in Starlette – OSTIF.org

https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette
generic

advisory-database/vulns/starlette/PYSEC-2026-161.yaml at main · pypa/advisory-database · GitHub

https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml
github Patch Available

Missing Host header validation poisons request.url.path, bypassing path-based security checks · Advisory · Kludex/starlette · GitHub

https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr
github_commit Patch Available

commit 764dab0dcfb9 (Kludex/starlette)

Patch available: Kludex/starlette 1.0.1 (contains commit 764dab0dcfb9)

https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6
generic

BadHost - CVE-2026-48710 Starlette Host-Header Auth Bypass

https://badhost.org

Vendor Advisories for CVE-2026-48710(12)

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

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhaiis/vllm-cuda-rhel9:17823528472026-06-25redhat
redhatrhaiis/vllm-rocm-rhel9:17823530932026-06-25redhat
redhatsatellite/iop-host-inventory-rhel9:17804142372026-06-16redhat
redhatansible-automation-platform-26/lightspeed-chatbot-rhel9:17801027322026-06-09redhat
redhatansible-automation-platform-27/lightspeed-chatbot-rhel9:17800991852026-06-04redhat
redhatsatellite/foreman-mcp-server-rhel9:17804920082026-06-03redhat
redhatsatellite/foreman-mcp-server-rhel9:17804920122026-06-03redhat

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

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
starlette0.1.0 ... 1.0.0rc1 (191 versions)1.0.1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 51× 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 115 total refreshes for this CVE.

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

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCeris-ths/supply-chain-guard
    First seen Apr 1, 2026

    Detect, assess, and respond to supply chain attacks across npm/yarn and Python (pip/poetry/uv). Claude Code skill + standalone scripts. Built during axios RAT (2026-03-31) and Starlette BadHost CVE-2026-48710 (2026-05-22).

    Open source ↗
  • Nucleihttp/cves/2026/CVE-2026-48710.yaml
    First seen Jan 1, 2026

    Starlette - Improper Validation of Unsafe Equivalence in Input

    Open source ↗

Frequently asked(5)

What is CVE-2026-48710?
CVE-2026-48710 is a medium vulnerability published on May 26, 2026. Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP Host request header was not validated before being used to reconstruct request.url. Because the routing algorithm relies on the raw HTTP path while request.url is rebuilt from the Host header, a malformed header…
When was CVE-2026-48710 disclosed?
CVE-2026-48710 was first published in the National Vulnerability Database on May 26, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48710 actively exploited?
CVE-2026-48710 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 70.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-48710?
CVE-2026-48710 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-48710?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48710, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-48710

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