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CVE-2026-54388

CRITICAL
9.1
CVSS 3.1
Description
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.

Metadata

CVE ID
CVE-2026-54388
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-06-12 20:20 UTC
Published
2026-06-17 19:59 UTC
Last updated
2026-06-17 19:59 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, 364cdb67e0ea00a8e4a7037e2693e0711e816adb
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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