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AIOHTTP is Vulnerable to Deserialization of Untrusted Data

Moderate severity GitHub Reviewed Published Jun 2, 2026 in aio-libs/aiohttp • Updated Jun 3, 2026

Package

pip aiohttp (pip)

Affected versions

< 3.14.0

Patched versions

3.14.0

Description

Summary

Using CookieJar.load() with untrusted input may allow arbitrary code execution.

Impact

Most applications using this function will be doing so with the user's own data, so this is unlikely to affect many applications.

Workaround

If an application does allow attacker controlled files to be loaded, a workaround on older releases would be to sanitise the files before loading.

Patch: aio-libs/aiohttp@dcf40f3

References

@Dreamsorcerer Dreamsorcerer published to aio-libs/aiohttp Jun 2, 2026
Published by the National Vulnerability Database Jun 2, 2026
Published to the GitHub Advisory Database Jun 3, 2026
Reviewed Jun 3, 2026
Last updated Jun 3, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
High
Privileges required
High
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:L/I:H/A:L

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(7th percentile)

Weaknesses

Deserialization of Untrusted Data

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. Learn more on MITRE.

CVE ID

CVE-2026-34993

GHSA ID

GHSA-jg22-mg44-37j8

Source code

Credits

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