Description
Paaster is a pastebin application. Prior to version 3.3.0, Paaster's "view once" (burn-after-reading) paste mode can be bypassed with concurrent requests. The check that's supposed to enforce single-use is a plain read followed by a separate write, with no atomicity, so multiple simultaneous requests can all see the paste as "not yet read" and all successfully retrieve it. This issue has been patched in version 3.3.0.
Published: 2026-11-11
Score: 6.3 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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History

Wed, 11 Nov 2026 22:15:00 +0000

Type Values Removed Values Added
Description Paaster is a pastebin application. Prior to version 3.3.0, Paaster's "view once" (burn-after-reading) paste mode can be bypassed with concurrent requests. The check that's supposed to enforce single-use is a plain read followed by a separate write, with no atomicity, so multiple simultaneous requests can all see the paste as "not yet read" and all successfully retrieve it. This issue has been patched in version 3.3.0.
Title Paaster: TOCTOU race condition defeats the 'burn after reading' guarantee on view-once pastes
Weaknesses CWE-362
References
Metrics cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-11-11T21:56:59.654Z

Reserved: 2026-07-30T16:19:08.082Z

Link: CVE-2026-68511

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-11T22:17:30.013

Modified: 2026-11-11T22:17:30.013

Link: CVE-2026-68511

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses
  • CWE-362

    Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')