CVE-2026-31827 — Alienbin: TTL Index Race Condition allows unauthorized deletion of other users data

CVE-2026-31827

Alienbin: TTL Index Race Condition allows unauthorized deletion of other users data PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
Blue-B / Alienbin	affected <= 1.0.0

CWE

CWE-362

References

https://github.com/Blue-B/Alienbin/security/advisories/GHSA-hqvr-6v89-gwff

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.