EUVD-2026-21519
GHSA-hjxq-7w9q-2jw6
5.7
CVSS 4.0
Share
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
P
Scope
X
Lifecycle Timeline
3
Analysis Generated
Apr 10, 2026 - 18:22 vuln.today
EUVD ID Assigned
Apr 10, 2026 - 18:22 euvd
EUVD-2026-21519
CVE Published
Apr 10, 2026 - 18:16 nvd
MEDIUM 5.7
Description
CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
Analysis
Python's HTTP client fails to reject carriage return and line feed (CR/LF) bytes in proxy tunnel headers and host parameters, enabling HTTP response splitting and header injection attacks. Authenticated attackers with high privileges can craft malicious proxy configurations to inject arbitrary HTTP headers or split responses, potentially leading to cache poisoning, session hijacking, or information disclosure. …
Sign in for full analysis, threat intelligence, and remediation guidance.
Priority Score
28
Low
Medium
High
Critical
KEV: 0
EPSS: +0.0
CVSS: +28
POC: 0
Share
External POC / Exploit Code
Leaving vuln.today
Destination URL
POC code from unknown sources may be malicious, contain backdoors, or be fake.
Always review and test exploit code in a safe, isolated environment (VM/sandbox).
Verify the source reputation and cross-reference with known databases (Exploit-DB, GitHub Security).