CVE-2025-68934

MediumCVSS 6.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-770

Affected software

Vendor	Product	Versions
discourse	discourse	< 3.5.4; >= 2025.11.0-latest, < 2025.11.2; >= 2025.12.0-latest, 2025.12.1; >= 2026.1.0-latest, < 2026.1.0

References

https://github.com/discourse/discourse/security/advisories/GHSA-vwjh-vrx9-9849Mitigation, Third Party Advisory

Timeline

Published: Jan 28, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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