Medium severity6.5OSV Advisory· Published Jan 28, 2026· Updated Jun 17, 2026
CVE-2025-68934
CVE-2025-68934
Description
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, authenticated users can submit crafted payloads to /drafts.json that cause O(n^2) processing in Base62.decode, tying up workers for 35-60 seconds per request. This affects all users as the shared worker pool becomes exhausted. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. Lowering the max_draft_length site setting reduces attack surface but does not fully mitigate the issue, as payloads under the limit can still trigger the slow code path.
AI Insight
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Affected products
6v2025.11.0, v2025.11.1+ 4 more
- (no CPE)range: v2025.11.0, v2025.11.1
- cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:*range: <3.5.4
- cpe:2.3:a:discourse:discourse:2025.12.0:*:*:*:stable:*:*:*
- cpe:2.3:a:discourse:discourse:2026.1.0:*:*:*:stable:*:*:*
- (no CPE)range: <3.5.4, <2025.11.2, <2025.12.1, <2026.1.0
Patches
Vulnerability mechanics
References
1- github.com/discourse/discourse/security/advisories/GHSA-vwjh-vrx9-9849nvdMitigationThird Party Advisory
News mentions
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