CVE•Published 2026-06-22•Modified 2026-06-26•0 articles on news•5 live references•NVD data

CVE-2026-54275Aiohttp · Aiohttp

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS percentile

Exploit Prediction Scoring System · top 83% of all CVEs

Weaknesses (CWE)

CWE-297Improper Validation of Certificate with Host Mismatch

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, the server_hostname TLS SNI check can be bypassed when an existing connection is reused. If an application makes multiple requests to the same domain, but with different per-request server_hostname parameters, then the later calls may succeed by reusing the existing connection when they should have been rejected due to the TLS SNI check. This vulnerability is fixed in 3.14.1.

Timeline

Published 2026-06-22

Modified 2026-06-26

External references

NVD MITRE Exploit-DB GitHub PoC VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-54275

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Aiohttp Aiohttp"

All exposed Aiohttp Aiohttp instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Aiohttp"

HTTP body or banner mentions "Aiohttp" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-54275