What’s Vulnerable › Vulnerabilities
CVE-2026-31827: Alienbin: TTL Index Race Condition allows unauthorized deletion of other users data
- Severity: high (CVSS 7.1 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-10 · updated 2026-06-17
- Weakness: CWE-362
Description
Alienbin is an anonymous code and text sharing web service. In 1.0.0 and earlier, the /save endpoint in server.js drops and recreates the MongoDB TTL index on the entire post collection for every new paste submission. When User B submits a paste with a short TTL (e.g., 30 seconds), the TTL index is recreated with expireAfterSeconds: 30 for all documents in the collection. This causes User A's paste (originally set to 7 days) to be deleted after 30 seconds. An attacker can intentionally delete all existing pastes by repeatedly submitting pastes with ttlOption=30s.
Affected products
- Blue-B Alienbin: through 1.0.0
References
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