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CVE-2026-54387

CRITICAL
9.1
CVSS 3.1
Description
Tinyproxy through 1.11.3, fixed in commit ff45d3b, fails to reconcile conflicting Content-Length and Transfer-Encoding: chunked headers, forwarding both verbatim to the backend while using Content-Length 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.

Metadata

CVE ID
CVE-2026-54387
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-06-12 20:20 UTC
Published
2026-06-17 19:48 UTC
Last updated
2026-06-17 19:54 UTC
Primary CWE
CWE-444
Inconsistent Interpretation of HTTP Requests ('HTTP Request/…
Vendor / Product
tinyproxy / tinyproxy
Sources
cve.org  ·  NVD

Severity & Metrics

9.1 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products (1)
VendorProductPlatformVersions
tinyproxy tinyproxy — 0 ≤ 1.11.3, ff45d3bf0e61d0f8ed97ab379d3047f04eb67521
Weakness (CWE)
CWESourceDescription
CWE-444 cna Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CVSS scores (2)
ScoreSeverityVersionSourceVector
9.3 CRITICAL 4.0 cna CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
9.1 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References (4)
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