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aiohttp CVE-2026-34993

| EUVDEUVD-2026-34001 HIGH
Deserialization of Untrusted Data (CWE-502)
2026-06-02 GitHub_M GHSA-jg22-mg44-37j8
RCE Deserialization Python Aiohttp
7.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.3 HIGH
AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
vuln.today AI
7.8 HIGH

Exploitation needs the app to load an attacker-supplied local file (AV:L, UI:R) under existing app privileges (PR:L); successful deserialization yields full code execution, so C/I/A:H.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
6.4 MEDIUM
AV:L/AC:H/PR:H/UI:R/S:C/C:L/I:H/A:L
Red Hat
7.2 HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

10
Analysis Updated
Jun 30, 2026 - 04:14 vuln.today
v5 (cvss_changed)
Analysis Updated
Jun 30, 2026 - 04:13 vuln.today
v4 (cvss_changed)
Analysis Updated
Jun 30, 2026 - 04:13 vuln.today
v3 (cvss_changed)
Analysis Updated
Jun 30, 2026 - 04:12 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jun 30, 2026 - 03:24 vuln.today
cvss_changed
Severity Changed
Jun 30, 2026 - 03:24 NVD
MEDIUM HIGH
CVSS changed
Jun 30, 2026 - 03:24 NVD
6.4 (MEDIUM) 7.3 (HIGH)
Patch available
Jun 02, 2026 - 21:02 EUVD
Source Code Evidence Fetched
Jun 02, 2026 - 20:30 vuln.today
Analysis Generated
Jun 02, 2026 - 20:30 vuln.today

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 15 pypi packages depend on aiohttp (12 direct, 3 indirect)

Ecosystem-wide dependent count for version 3.14.0.

DescriptionNVD

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.

AnalysisAI

Arbitrary code execution in the aiohttp Python framework (versions prior to 3.14.0) arises when CookieJar.load() deserializes an attacker-controlled file, classed as CWE-502 unsafe deserialization. An attacker who can plant or substitute the persisted cookie file and induce the application to load it gains code execution in the host process. There is no public exploit identified at time of analysis, EPSS is very low (0.06%), and CISA SSVC rates exploitation as none - consistent with the library's own note that the function is normally used on the user's own trusted data.

Technical ContextAI

aiohttp is a widely used asynchronous HTTP client/server framework for Python's asyncio. The flaw is in the client-side CookieJar persistence API: CookieJar.save() and CookieJar.load() serialize/deserialize the cookie store, and load() reconstructs Python objects from the file in a way that can execute embedded payloads (the classic pickle/deserialization pattern, mapped here to CWE-502). The single affected CPE is cpe:2.3:a:aio-libs:aiohttp:*, i.e. the upstream aio-libs aiohttp package; the root cause is trusting the structure and types of an externally supplied serialized blob rather than validating it against a safe schema.

RemediationAI

Vendor-released patch: aiohttp 3.14.0 - upgrade to 3.14.0 or later, which contains the fix (commit dcf40f30637e8752c76781cf6703b5a236749a00). On Red Hat systems, apply the packages in RHSA-2026:24977. If immediate upgrade is not possible, the upstream-recommended workaround is to never call CookieJar.load() on files that could be attacker-controlled and to sanitize/validate cookie files before loading them; alternatively restrict filesystem permissions on the persisted cookie file so only the trusted application user can write it, accepting that this only helps where local file tampering is the threat. Refer to the advisory at https://github.com/aio-libs/aiohttp/security/advisories/GHSA-jg22-mg44-37j8.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Public Cloud 15 SP7 Fixed
SUSE Linux Enterprise Module for Python 3 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed

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CVE-2026-34993 vulnerability details – vuln.today
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