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CVE-2026-97701 Details

Description

Zulip is an open-source team collaboration tool. In Zulip Server versions through 12.1, the authenticated POST /messages/render endpoint renders the content parameter without enforcing the normal message length limit used by message send and edit operations. An authenticated user can submit Markdown up to the server body-size limit, causing disproportionate backend CPU consumption, and repeated or concurrent requests can degrade Markdown rendering performance or backend availability for other users. This issue is fixed in version 12.2.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/zulip/zulip/commit/31773c77c501391ede0fa8ec727f39508664e0ae	[email protected]
https://github.com/zulip/zulip/commit/4d94dd2ee6337a4b3351694dd314a45d3fe11031	[email protected]
https://github.com/zulip/zulip/pull/39913	[email protected]
https://github.com/zulip/zulip/releases/tag/12.2	[email protected]
https://github.com/zulip/zulip/security/advisories/GHSA-m257-w4r5-5rmf	[email protected]
https://zulip.readthedocs.io/en/latest/overview/changelog.html#zulip-server-12-2	[email protected]

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-770	Allocation of Resources Without Limits or Throttling	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Nov 4, 2026	CVE Modified	CISA-ADP
Nov 4, 2026	New CVE Received	[email protected]