Distribution advisory
This page covers CVE-2026-34515 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 over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.
CVSS metrics in full
The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Attack vector: Network — reachable from anywhere that can route to the service.
- Attack complexity: Low — the attack works reliably, with no preparation.
- Privileges required: None — an unauthenticated stranger can try it.
- User interaction: None — nobody has to be tricked into anything.
- Scope: Unchanged — the damage stays inside the vulnerable component.
- Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
- Integrity impact: None.
- Availability impact: None.
Weakness class
ROOT-APP-PYPI-CVE-2026-34515 is classified as CWE-36: Absolute Path Traversal. The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize absolute path sequences such as "/abs/path" that can resolve to a location that is outside of that directory.
Affected software
ROOT-APP-PYPI-CVE-2026-34515 is recorded against 2 packages.
- aiohttp (fixed in 3.12.15+aikido.8)
- rootio-aiohttp (fixed in 3.13.3+root.io.12)
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:
Same weakness in other software
These advisories are the same class of weakness (CWE-36: Absolute Path Traversal) in other software:
