CVE-2026-54388

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-17. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

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

Tinyproxy through 1.11.3, fixed in commit 364cdb6, fails to reject requests containing multiple Content-Length headers with differing values, forwarding all duplicate headers to the backend while using the first value to determine how many request body bytes to consume. Remote attackers can desynchronize the proxy and backend parser state, allowing injection of arbitrary HTTP requests to the backend to enable cache poisoning, access control bypass, and request hijacking.

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
35.8%
KEV
Not listed

Published

June 17, 2026

Last Modified

July 14, 2026

Advisory Details (4)

Auto-updated Jun 17, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
generic

Tinyproxy - HTTP Request Smuggling via Duplicate Content-Length Headers | Advisories | VulnCheck

https://www.vulncheck.com/advisories/tinyproxy-http-request-smuggling-via-duplicate-content-length-headers
github_pr

Prevent request smuggling

Fix merged in tinyproxy/tinyproxy PR #610 on 2026-05-07 — awaiting tagged release

https://github.com/tinyproxy/tinyproxy/pull/610
generic

HTTP Request Smuggling: CL/TE desync + duplicate Content-Length forwarding · Issue #609 · tinyproxy/tinyproxy · GitHub

https://github.com/tinyproxy/tinyproxy/issues/609
github_commit

commit 364cdb67e0ea (tinyproxy/tinyproxy)

Fix landed in tinyproxy/tinyproxy commit 364cdb67e0ea — awaiting tagged release

https://github.com/tinyproxy/tinyproxy/commit/364cdb67e0ea00a8e4a7037e2693e0711e816adb

Vendor Advisories for CVE-2026-54388(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 184× 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 229 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54388?
CVE-2026-54388 is a critical vulnerability published on June 17, 2026. Tinyproxy through 1.11.3, fixed in commit 364cdb6, fails to reject requests containing multiple Content-Length headers with differing values, forwarding all duplicate headers to the backend while using the first value to determine how many request body bytes to consume. Remote attackers can…
When was CVE-2026-54388 disclosed?
CVE-2026-54388 was first published in the National Vulnerability Database on June 17, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54388 actively exploited?
CVE-2026-54388 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54388?
CVE-2026-54388 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-54388?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54388, 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.

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