b2-sdk-python TOCTOU application key disclosure

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

5.7 · CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2022-23651: 0.22% estimated exploitation activity in the next 30 days; percentile 12.23 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact Linux and Mac releases of the SDK version 1.14.0 and below contain a key disclosure vulnerability that, in certain conditions, can be exploited by local attackers through a time-of-check-time-of-use (TOCTOU) race condition. SDK users of the SqliteAccountInfo format are vulnerable while users of the InMemoryAccountInfo format are safe. The SqliteAccountInfo saves API keys (and bucket name-to-id mapping) in a local database file ($XDGCONFIGHOME/b2/accountinfo, ~/.b2accountinfo or a user-defined path). When first created, the file is world readable and is (typically a few milliseconds) later altered to be private to the user. If the directory containing the file is readable by a local attacker then during the brief period between file creation and permission modification, a local attacker can race to open the file and maintain a handle to it. This allows the local attacker to read the contents after the file after the sensitive information has been saved to it. Consumers of this…

Published by the source

24 Feb 2022, 12:08 UTC

Last modified by the source

4 Sep 2024, 21:01 UTC

Source last checked

26 Oct 2026, 13:16 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-p867-fxfr-ph2w

2. Revision 2 · amended · 25 Oct 2026

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

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-p867-fxfr-ph2w

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# Patch Next advisory brief: CVE-2022-23651

Advisory: b2-sdk-python TOCTOU application key disclosure
IDs: CVE-2022-23651, GHSA-p867-fxfr-ph2w
Record: https://patchnext.com/advisories/cve-2022-23651 (revision 3, source checked 26 Oct 2026, 13:16 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: b2sdk 1.14.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI b2sdk: affected < 1.14.1; fixed in 1.14.1

## Suggested inspection (read-only)
- `python -m pip show b2sdk`: 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 b2sdk.
- 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-p867-fxfr-ph2w (OSV record GHSA-p867-fxfr-ph2w lists affected ranges: PyPI b2sdk >=0 <1.14.1 (fixed))
- Verified: https://github.com/advisories/GHSA-p867-fxfr-ph2w (GitHub-reviewed advisory GHSA-p867-fxfr-ph2w lists affected ranges: PyPI b2sdk >=0 <1.14.1)

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