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CVE-2025-68934

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CVE-2025-68934

Published: Jan 28, 2026

Modified: Jan 28, 2026

PUBLISHED

CVSS v3.1

6.5

MEDIUM

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.

VendorProductVersions

discourse

discourse

affected
< 3.5.4
affected
>= 2025.11.0-latest, < 2025.11.2
affected
>= 2025.12.0-latest, 2025.12.1
affected
>= 2026.1.0-latest, < 2026.1.0

Weaknesses (CWE)

CWE-770

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

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