Vulnerabilities in pkg:pypi/aiohttp-session

PACKAGE
Advisory Identifier: GHSA-fpwp-69xv-c67f
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Advisory Summary

CVE-2018-1000519 is a HIGH (CVSS 6.5) aiohttp-session session fixation vulnerability vulnerability (CWE-384: Session Fixation) affecting Aiohttp session libraries in the PyPI ecosystem. The issue involves aiohttp-session session fixation vulnerability. Remediation is available by upgrading affected packages to version 2.4.0.

2 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:pypi/aiohttp-session

2 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:pypi/aiohttp-session. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-fpwp-69xv-c67f CVE-2018-1000519 HIGH aiohttp-session Session Fixation vulnerability
GHSA-mr4x-c4v9-x729 CVE-2018-1000814 HIGH aiohttp-session creates non-expiring sessions

CVE-2018-1000519 at a Glance

CVE Identifier CVE-2018-1000519
GHSA Identifier GHSA-fpwp-69xv-c67f
Severity HIGH
CVSS v3.1 Base Score 6.5
CWE Classification CWE-384: Session Fixation
Affected Product Aiohttp session
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2018-1000519

To remediate this vulnerability, upgrade all affected Aiohttp session dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

aiohttp-session fixed: 2.4.0 
pip install aiohttp-session>=2.4.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show aiohttp-session

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2018-1000519, inspect your installed packages using pip:

pip show aiohttp-session

Analyze the terminal output to locate any version of Aiohttp session in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.4.0), your application is affected.

Note: The pip show aiohttp-session command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-384: Session Fixation, where authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions. In Aiohttp session, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

The pypi package aiohttp-session before 2.4.0 contained a Session Fixation vulnerability in `load_session` function for RedisStorage that can result in Session Hijacking. This attack appear to be exploitable via Any method that allows setting session cookies (`?session=<>`, or meta tags or script tags with Set-Cookie).

CVE-2018-1000519 Affected Aiohttp session Versions

1 component(s)
Fixed Versions:
2.4.0
Product / Package Ecosystem Affected Versions Fixed Version
aiohttp-session
pypi/aiohttp-session
PyPI
< 2.4.0
2.4.0

References

NVD — CVE-2018-1000519 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-1000519
Aiohttp session Source Repository REPOSITORY
https://github.com/aio-libs/aiohttp-session/issues/272
Security Fix Commit FIX COMMIT
https://github.com/aio-libs/aiohttp-session/commit/6b7864004d3442dbcfaf8687f63262c1c629f569
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-fpwp-69xv-c67f
Aiohttp session Source Repository REPOSITORY
https://github.com/aio-libs/aiohttp-session
Aiohttp session Source Repository REPOSITORY
https://github.com/aio-libs/aiohttp-session/blob/master/aiohttp_session/redis_storage.py#L60
Aiohttp session Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/aiohttp-session/PYSEC-2018-80.yaml

Frequently Asked Questions

What is CVE-2018-1000519?
CVE-2018-1000519 is a security vulnerability in Aiohttp session involving aiohttp-session Session Fixation vulnerability under CWE-384: Session Fixation.
Which Aiohttp session versions are affected?
Affected versions include releases prior to 2.4.0 across affected packages: aiohttp-session.
What version fixes CVE-2018-1000519?
Upgrading to 2.4.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is aiohttp-session affected?
Yes, aiohttp-session is affected in releases prior to 2.4.0. Upgrade your dependency to 2.4.0 or later.
What is the CVSS score of CVE-2018-1000519?
CVE-2018-1000519 has a CVSS v3.1 base score of 6.5 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2018-1000519?
CVE-2018-1000519 is classified under CWE-384: Session Fixation (Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.).
How can I check PyPI dependencies for CVE-2018-1000519?
Run the dependency tree command: 'pip show aiohttp-session'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fpwp-69xv-c67f",
  "modified" : "2025-07-11T23:17:38Z",
  "published" : "2018-09-13T15:46:40Z",
  "aliases" : [ "CVE-2018-1000519" ],
  "summary" : "aiohttp-session Session Fixation vulnerability",
  "details" : "The pypi package aiohttp-session before 2.4.0 contained a Session Fixation vulnerability in `load_session` function for RedisStorage that can result in Session Hijacking. This attack appear to be exploitable via Any method that allows setting session cookies (`?session=<>`, or meta tags or script tags with Set-Cookie).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "aiohttp-session"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.4.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-1000519"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/aio-libs/aiohttp-session/issues/272"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/aio-libs/aiohttp-session/commit/6b7864004d3442dbcfaf8687f63262c1c629f569"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-fpwp-69xv-c67f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/aio-libs/aiohttp-session"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/aio-libs/aiohttp-session/blob/master/aiohttp_session/redis_storage.py#L60"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/aiohttp-session/PYSEC-2018-80.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-384" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T21:35:06Z",
    "nvd_published_at" : "2018-06-26T16:29:01Z"
  }
}