How severe is CVE-2026-34993?

CVE-2026-34993 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over local access with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity high, and availability low.

Is CVE-2026-34993 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34993?

CVE-2026-34993 affects Aiohttp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34993?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34993 have an EU (EUVD) identifier?

Yes. CVE-2026-34993 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34001.

When was CVE-2026-34993 published?

CVE-2026-34993 was published on 2026-06-02 and last updated on 2026-07-08.

CVE-2026-34993

CVE-2026-34993 is a medium-severity vulnerability in Aiohttp with a CVSS 3.x base score of 6.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: Medium (CVSS 3.x base score 6.4)
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34001
Weakness: CWE-502
Affected product: Aiohttp
Published: 2026-06-02
Last modified: 2026-07-08

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, using ``CookieJar.load()`` with untrusted input may allow arbitrary code execution. Most applications using this function will be doing so with the user's own data, so this is unlikely to affect many applications. Version 3.14.0 patches the issue. If an application does allow attacker controlled files to be loaded, a workaround on older releases would be to sanitize the files before loading.

Frequently asked questions

What is CVE-2026-34993?: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, using ``CookieJar.load()`` with untrusted input may allow arbitrary code execution. Most applications using this function will be doing so with the user's own data, so this is unlikely to affect many applications. Version 3.14.0 patches the issue. If an application does allow attacker controlled files to be loaded, a workaround on older releases would be to sanitize the files before loading.
How severe is CVE-2026-34993?: CVE-2026-34993 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over local access with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity high, and availability low.
Is CVE-2026-34993 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34993?: CVE-2026-34993 affects Aiohttp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34993?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34993 have an EU (EUVD) identifier?: Yes. CVE-2026-34993 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34001.
When was CVE-2026-34993 published?: CVE-2026-34993 was published on 2026-06-02 and last updated on 2026-07-08.

References

Affected products (1)

cpe:2.3:a:aiohttp:aiohttp:*:*:*:*:*:*:*:*

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