Is CVE-2026-34514 in the CISA KEV catalog?

No. CVE-2026-34514 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-34514?

CVE-2026-34514 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2026-34514?

CVE-2026-34514 has an EPSS score of 0.32% (23th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-34514?

Upgrade python-aiohttp on debian 11 to 3.7.4-1+deb11u2 or later.

CVE & CISA-KEV Catalog

CVE-2026-34514

MEDIUM

5.3

CVSS v3

NVD

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an attacker who controls the content_type parameter in aiohttp could use this to inject extra headers or similar exploits. This issue has been patched in version 3.13.4.

CWE-113

How to fix

Remediation Available

python-aiohttpDebian

Fixed in:3.7.4-1+deb11u2CVE-2026-34514

Fixed in:3.13.5-1CVE-2026-34514

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

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.32%probability of exploitation in 30 days

23rdpercentile

Low risk: more likely to be exploited than 23% of all known CVEs.

References

Patch2

Release Notes1

github.com

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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 2026-04-15.