GHSA-w2fm-2cpv-w7v5 — medium GitHub Advisory (CVE-2026-22815) in pip/aiohttp

Description

Summary

Insufficient restrictions in header/trailer handling could cause uncapped memory usage.

Impact

An application could cause memory exhaustion when receiving an attacker controlled request or response. A vulnerable web application could mitigate these risks with a typical reverse proxy configuration.

Patch: https://github.com/aio-libs/aiohttp/commit/0c2e9da51126238a421568eb7c5b53e5b5d17b36

Basic information

Type: reviewed
Severity: medium
Advisory on GitHub: Open advisory ↗
Repository advisory: Open repository advisory ↗
Source code: Browse source ↗
Published (advisory): 2026-04-01 19:45:17 UTC
Updated: 2026-04-06 16:46:37 UTC
GitHub reviewed: 2026-04-01 19:45:17 UTC
NVD published: 2026-04-01

Score	Percentile
0.05%	16.48%

CVSS Scores

Base score	Version	Severity	Vector
6.9	4.0	—	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network. Attack complexity (AC:L) Exploitation conditions are straightforward and stable. Attack requirements (AT:N) No additional preconditions are required beyond normal reachability. Privileges required (PR:N) No privileges are required. User interaction (UI:N) No user interaction is required. Vulnerable system confidentiality impact (VC:N) No confidentiality impact on the vulnerable system. Vulnerable system integrity impact (VI:N) No integrity impact on the vulnerable system. Vulnerable system availability impact (VA:L) Limited availability impact on the vulnerable system. Subsequent system confidentiality impact (SC:N) No confidentiality impact on subsequent systems. Subsequent system integrity impact (SI:N) No integrity impact on subsequent systems. Subsequent system availability impact (SA:N) No availability impact on subsequent systems.

Identifiers

Type	Value
GHSA	GHSA-w2fm-2cpv-w7v5 ↗
CVE	CVE-2026-22815 ↗

CWEs

CWE id	Name
CWE-400	Uncontrolled Resource Consumption
CWE-770	Allocation of Resources Without Limits or Throttling

Credits

sg3-141-592 (reporter)
Dreamsorcerer (remediation_developer)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem	Package	Vulnerable range	First patched	Vulnerable functions
pip	aiohttp	<= 3.13.3	3.13.4	—

aiohttp allows unlimited trailer headers, leading to possible uncapped memory usage