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High, CVSS 7.1amended

aiohttp-session creates non-expiring sessions

CVE-2018-1000814GHSA-mr4x-c4v9-x729

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (aiohttp-session 2.7.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
7.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2018-1000814: 0.97% estimated exploitation activity in the next 30 days; percentile 61.74 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

aio-libs aiohttp-session version 2.6.0 and earlier contains a Other/Unknown vulnerability in EncryptedCookieStorage and NaClCookieStorage that can result in Non-expiring sessions / Infinite lifespan. This attack appear to be exploitable via Recreation of a cookie post-expiry with the same value.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-mr4x-c4v9-x729

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-mr4x-c4v9-x729

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2018-1000814

Advisory: aiohttp-session creates non-expiring sessions
IDs: CVE-2018-1000814, GHSA-mr4x-c4v9-x729
Record: https://patchnext.com/advisories/cve-2018-1000814 (revision 3, source checked 26 Oct 2026, 13:31 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: aiohttp-session 2.7.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI aiohttp-session: affected <= 2.6.0; fixed in 2.7.0

## Suggested inspection (read-only)
- `python -m pip show aiohttp-session`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on aiohttp-session.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-mr4x-c4v9-x729 (OSV record GHSA-mr4x-c4v9-x729 lists affected ranges: PyPI aiohttp-session >=0 <2.7.0 (fixed))
- Verified: https://github.com/advisories/GHSA-mr4x-c4v9-x729 (GitHub-reviewed advisory GHSA-mr4x-c4v9-x729 lists affected ranges: PyPI aiohttp-session >=0 <=2.6.0)

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