Pi: Race condition in auth.json writes could expose stored credentials

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Pi is a minimal terminal coding harness. From 0.74.0 until 0.78.1, Pi stored API keys and OAuth credentials in auth.json. A race condition in the file write path could briefly create or rewrite this file with permissions derived from the process umask before tightening the file to owner-only permissions. This vulnerability is fixed in 0.78.1.

Source published

23 Jun 2026 19:28:22 UTC

Source modified

26 Jun 2026 18:09:58 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

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CVSS 3.1 · 2.2 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N

Pi is a minimal terminal coding harness. From 0.74.0 until 0.78.1, Pi stored API keys and OAuth credentials in auth.json. A race condition in the file write path could briefly create or rewrite this file with permissions derived from the process umask before tightening the file to owner-only permissions. This vulnerability is fixed in 0.78.1.

Source published

Jun 23, 2026, 7:28:22 PM (timezone not stated)

Source modified

Jun 26, 2026, 6:09:58 PM (timezone not stated)

Observed here

7 Nov 2026 12:29:40 UTC

Source terms

ENISA EUVD · source terms and attribution apply

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EUVD CVSS 3.1 · 2.2 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N

Pi is a minimal terminal coding harness. From 0.74.0 until 0.78.1, Pi stored API keys and OAuth credentials in auth.json. A race condition in the file write path could briefly create or rewrite this file with permissions derived from the process umask before tightening the file to owner-only permissions. This vulnerability is fixed in 0.78.1.

Source published

23 Jun 2026 20:16:49 UTC

Source modified

25 Oct 2026 23:10:00 UTC

Observed here

27 Oct 2026 14:13:32 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

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CVSS 3.1 · [email protected] · Secondary · 2.2 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N

# Pi auth.json writes could briefly expose stored credentials to local users Pi stored API keys and OAuth credentials in `auth.json`. A race condition in the file write path could briefly create or rewrite this file with permissions derived from the process umask before tightening the file to owner-only permissions. ## Info The affected credential storage code wrote `auth.json` and then corrected the file mode in a separate operation. During the interval between those operations, a local user who could read and traverse the Pi agent configuration directory could potentially read the file before its permissions were restricted. The file can contain API keys, OAuth access tokens, and OAuth refresh tokens for configured providers. The affected behavior was present in the original `auth.json` credential storage implementation and thus affects both the original `@mariozechner/pi-coding-agent` package as well as `@earendil-works/pi-coding-agent`. ## Impact Exploitation requires local access to the same machine and read/traverse access to the victim's Pi agent configuration directory. Users whose `~/.pi/agent` directory is private to their account are less exposed. The main impact is disclosure of stored provider credentials, which may allow use of the configured provider accounts according to the privileges of those credentials. This is not remotely exploitable by itself. ## Affected versions - Affected: `@mariozechner/pi-coding-agent >= 0.28.0, <= 0.73.1` - Affected: `@earendil-works/pi-coding-agent >= 0.74.0, < 0.78.1` - Patched: `@earendil-works/pi-coding-agent >= 0.78.1` ## The solution Version 0.78.1 changed the credential storage writes to create `auth.json` with mode `0600` at open time. The fix applies to initial file creation and credential save paths, including OAuth token refresh writes. ## Recommendations Upgrade to `@earendil-works/pi-coding-agent` version 0.78.1 or later. Users still on the deprecated `@mariozechner/pi-coding-agent` package should migrate to the `@earendil-works/pi-coding-agent` package and install version 0.78.1 or later. After upgrading, rotate any credentials that may have been exposed on multi-user systems where the Pi agent configuration directory was readable by other local users. ## Workarounds If upgrading immediately is not possible, restrict the Pi agent configuration directory so only the owning user can traverse it, restrict `auth.json` to owner-only permissions, and run Pi with a restrictive umask such as `077` until the upgrade is complete. ## Timeline - 2026-05-29: Report received - 2026-06-02: Fix committed - 2026-06-04: Fixed version released - 2026-06-08: Advisory published ## Credits Reported by Paul Urian and Cosmin Alexa of CrowdStrike.

Source published

17 Jun 2026 13:54:37 UTC

Source modified

20 Jul 2026 21:30:42 UTC

Observed here

24 Oct 2026 13:17:17 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N

Publisher rating · LOW