CVEvulnerability

CVE-2026-34520

2.7 LOW Published 2026-04-01 Modified 2026-10-26 Official page ↗
Status
Analyzed
Published
2026-04-01
Last modified
2026-10-26
Assigner
[email protected]
CVSS 4.0 ([email protected])
2.7 LOW — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/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
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Weaknesses
CWE-113

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, the C parser (the default for most installs) accepted null bytes and control characters in response headers. This issue has been patched in version 3.13.4.

Affected configurations

• aiohttp aiohttp (< 3.13.4)

Related

Weakness · CWE (1)

  • CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers weakness

References