Is CVE-2026-54275 in the CISA KEV catalog?

No. CVE-2026-54275 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-54275?

CVE-2026-54275 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2026-54275?

CVE-2026-54275 has an EPSS score of 0.27% (18th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-54275?

Upgrade python-aiohttp on debian unstable to 3.14.1-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-54275

HIGH

7.5

CVSS v3

NVD

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.

CWE-297

How to fix

Remediation Available

python-aiohttpDebian

Fixed in:3.14.1-1CVE-2026-54275

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.27%probability of exploitation in 30 days

18thpercentile

Low risk: more likely to be exploited than 18% of all known CVEs.

References

Third-Party Advisory1

github.com

Related Vulnerabilities

Other CWE-297 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-3522	Medium	4.0	5.6%	-	Fix
CVE-2018-10936	High	8.1	2.9%	-	Fix
CVE-2024-2466	Medium	6.5	1.3%	-	Fix
CVE-2020-1887	Critical	9.1	1.3%	-	Fix
CVE-2020-14387	High	7.4	1.1%	-	Fix
CVE-2020-15260	Medium	6.8	1.0%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-26.