Dashboard / CVE-2026-54387

CVE-2026-54387

CRITICAL
INFO Priority: 0.04 BB Relevance: 79/100
Published: 2026-06-17 Modified: 2026-11-08 First seen: 2026-11-08 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
AT: None
VC: High
VI: High
VA: None

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
tinyproxy tinyproxy 0

References & Advisories (4)

Bug Bounty Relevance

79 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

9.3 / 10.0 v4.0
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

EPSS — Exploitation Probability

0.44%
Raw Score 0.004390
Percentile 38.6%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00439
2026-11-12
0.00439
2026-11-10
0.00439
2026-11-09
0.00439
2026-11-08
0.00439

Intelligence Sources

mitre ref →

External Links