CVE-2026-54327 (GCVE-0-2026-54327)

Vulnerability from cvelistv5 – Published: 2026-06-23 19:28 – Updated: 2026-06-26 18:09

Title

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

Summary

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.

Severity

2.2 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-26 18:09 UTC

CWE

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-732 - Incorrect Permission Assignment for Critical Resource

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/earendil-works/pi/security/adv…	x_refsource_CONFIRM
https://github.com/earendil-works/pi/commit/135fb…	x_refsource_MISC
https://github.com/earendil-works/pi/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
earendil-works	pi	Affected: >= 0.74.0, < 0.78.1	guessed

Show details on NVD website

JSON

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FKIE_CVE-2026-54327

Vulnerability from fkie_nvd - Published: 2026-06-23 20:16 - Updated: 2026-06-26 19:16

Severity

2.2 (Low) - CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/earendil-works/pi/commit/135fb545f99106a4a249274f129b90bc0a77d347
	security-advisories@github.com	https://github.com/earendil-works/pi/releases/tag/v0.78.1
	security-advisories@github.com	https://github.com/earendil-works/pi/security/advisories/GHSA-r95r-rj6r-c39x

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "pi",
          "vendor": "earendil-works",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.74.0, \u003c 0.78.1"
            }
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        }
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    }
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      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-54327",
  "lastModified": "2026-06-26T19:16:43.220",
  "metrics": {
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}

GHSA-R95R-RJ6R-C39X

Vulnerability from github – Published: 2026-06-17 13:54 – Updated: 2026-07-20 21:12

Summary

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

Details

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.

Severity

2.2 (Low)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@mariozechner/pi-coding-agent"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.28.0"
            },
            {
              "last_affected": "0.73.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@earendil-works/pi-coding-agent"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.74.0"
            },
            {
              "fixed": "0.78.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54327"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-367",
      "CWE-732"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-17T13:54:37Z",
    "nvd_published_at": "2026-06-23T20:16:49Z",
    "severity": "LOW"
  },
  "details": "# Pi auth.json writes could briefly expose stored credentials to local users\n\nPi 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.\n\n## Info\n\nThe 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.\n\nThe 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`.\n\n## Impact\n\nExploitation requires local access to the same machine and read/traverse access to the victim\u0027s 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.\n\nThis is not remotely exploitable by itself.\n\n## Affected versions\n\n- Affected: `@mariozechner/pi-coding-agent \u003e= 0.28.0, \u003c= 0.73.1`\n- Affected: `@earendil-works/pi-coding-agent \u003e= 0.74.0, \u003c 0.78.1`\n- Patched: `@earendil-works/pi-coding-agent \u003e= 0.78.1`\n\n## The solution\n\nVersion 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.\n\n## Recommendations\n\nUpgrade 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.\n\nAfter 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.\n\n## Workarounds\n\nIf 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.\n\n## Timeline\n\n- 2026-05-29: Report received\n- 2026-06-02: Fix committed\n- 2026-06-04: Fixed version released\n- 2026-06-08: Advisory published\n\n## Credits\n\nReported by Paul Urian and Cosmin Alexa of CrowdStrike.",
  "id": "GHSA-r95r-rj6r-c39x",
  "modified": "2026-07-20T21:12:58Z",
  "published": "2026-06-17T13:54:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/earendil-works/pi/security/advisories/GHSA-r95r-rj6r-c39x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54327"
    },
    {
      "type": "WEB",
      "url": "https://github.com/earendil-works/pi/commit/135fb545f99106a4a249274f129b90bc0a77d347"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/earendil-works/pi"
    },
    {
      "type": "WEB",
      "url": "https://github.com/earendil-works/pi/releases/tag/v0.78.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Pi Agent: Race condition in Pi auth.json writes could expose stored credentials"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-54327 (GCVE-0-2026-54327)

FKIE_CVE-2026-54327

GHSA-R95R-RJ6R-C39X

Pi auth.json writes could briefly expose stored credentials to local users

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