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)
EG Risk
—
EPSS
70.4%
KEV
Not listed

Published

May 26, 2026

Last Modified

July 22, 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(13)

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

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 22, 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 70.4% 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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