🛡️ CVE-2026-34993 on PyPI (Root.io) — aiohttp

Distribution advisory

This page covers CVE-2026-34993 as tracked by PyPI (Root.io), for the package aiohttp. The fix is available in version 3.12.15+aikido.8; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high. (rating taken from the base CVE record.)

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

• Attack vector: Local — a local account, shell or session on the host is needed.
• Attack complexity: Low — the attack works reliably, with no preparation.
• Privileges required: Low — an ordinary user account is enough.
• User interaction: Required — someone has to click, open or visit something.
• Scope: Unchanged — the damage stays inside the vulnerable component.
• Confidentiality impact: High — total loss, or loss the attacker controls.
• Integrity impact: High — total loss, or loss the attacker controls.
• Availability impact: High — total loss, or loss the attacker controls.

Weakness class

ROOT-APP-PYPI-CVE-2026-34993 is classified as CWE-502: Deserialization of Untrusted Data. Serialised data from an untrusted source is reconstructed into objects, which can trigger code during the process.

Affected software

ROOT-APP-PYPI-CVE-2026-34993 is recorded against 2 packages.

• aiohttp (fixed in 3.12.15+aikido.8)
• rootio-aiohttp (fixed in 3.13.4+root.io.3)

Timeline and source

Published on 20 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

Other advisories for this package

aiohttp has other advisories on record. If you are patching this one, these are worth checking on the same host:

• ROOT-APP-PYPI-CVE-2025-69226 (2.0 Low, published 20 Aug 2026)
• ROOT-APP-PYPI-CVE-2026-54275 (2.0 Low, published 20 Aug 2026)
• ROOT-APP-PYPI-CVE-2026-34513 (2.0 Low, published 20 Aug 2026)
• ROOT-APP-PYPI-CVE-2026-69244 (8.0 High, published 20 Aug 2026)
• ROOT-APP-PYPI-CVE-2026-34519 (2.0 Low, published 20 Aug 2026)
• ROOT-APP-PYPI-CVE-2025-69225 (2.0 Low, published 20 Aug 2026)
• ROOT-APP-PYPI-CVE-2026-54274 (5.0 Medium, published 20 Aug 2026)
• ROOT-APP-PYPI-CVE-2026-22815 (5.0 Medium, published 20 Aug 2026)

Same weakness in other software

These advisories are the same class of weakness (CWE-502: Deserialization of Untrusted Data) in other software:

• CVE-2026-59940 (9.8 Critical, published 18 Aug 2026)
• CVE-2026-47058 (8.0 High, published 17 Aug 2026)

CVE-2026-34993 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Affected Packages

References