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CVE-2026-123523— Vikunja before 2.7.1 Memory Exhaustion via Unbounded Avatar Size Cache

Quick assessment

Affected

go-vikunja vikunja

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vikunja 2.7.1 之前的版本存在一个不受控的资源消耗漏洞，允许已认证用户通过请求多种不同尺寸的个人头像来耗尽服务器内存。攻击者可上传一个高噪点的头像，并逐个获取从 1 到 1024 像素尺寸的该头像。由于系统未实施缓存淘汰机制，每个账户可能缓存约 1GB 的数据，最终导致 API 进程因内存不足（OOM）被操作系统终止。

CVSS 6.5 · Medium Updated Nov 08, 2026

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

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Vulnerability Information

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Vulnerability Title

Vikunja before 2.7.1 Memory Exhaustion via Unbounded Avatar Size Cache

Source: CVE Program / CVE List V5

Vulnerability Description

Vikunja before 2.7.1 contains an uncontrolled resource consumption vulnerability that allows authenticated users to exhaust server memory by requesting avatars at many distinct sizes. Attackers can upload a noisy avatar and fetch it at each size up to 1024, caching roughly a gigabyte per account without eviction and causing the API process to be OOM-killed.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

不加限制或调节的资源分配

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
go-vikunja	vikunja	0 ~ 2.7.1	-

II. Public POCs for CVE-2026-123523

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

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III. Intelligence Information for CVE-2026-123523

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Other References for CVE-2026-123523 (2)

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-3x3m-2j93-w46j vendor-advisory
https://www.vulncheck.com/advisories/vikunja-before-2.7.1-memory-exhaustion-via-unbounded-avatar-size-cache third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-123523

Same Patch Batch · go-vikunja · 2026-11-08 · 39 CVEs total

CVE-2026-123531	8.8 HIGH	Vikunja 1.0.0 before 2.7.1 Pagination Limit Bypass via page=0 Parameter
CVE-2026-123522	7.1 HIGH	Vikunja before 2.7.1 Task Information Disclosure via Kanban Bucket Move Webhook
CVE-2026-123520	7.1 HIGH	Vikunja 0.18.0 before 2.7.1 Privilege Escalation via Account Deletion
CVE-2026-123497	6.8 MEDIUM	Vikunja veans before 2.7.1 HTTPS to HTTP Downgrade in Server Discovery
CVE-2026-123528	6.8 MEDIUM	Vikunja before 2.7.1 Insufficient Session Expiration via HTTP Token Middleware
CVE-2026-123513	6.8 MEDIUM	Vikunja before 2.7.1 Auth Token Leak via API URL Change
CVE-2026-123519	6.5 MEDIUM	Vikunja before 2.7.1 Memory Exhaustion DoS via WeKan and Vikunja-File Imports
CVE-2026-123501	6.5 MEDIUM	Vikunja before 2.7.1 Memory Exhaustion DoS via Unbounded Image Decodes
CVE-2026-123525	6.5 MEDIUM	Vikunja before 2.7.1 Memory Exhaustion DoS via Trello, Todoist and Microsoft To Do Migrati
CVE-2026-123500	6.2 MEDIUM	Vikunja before 2.7.1 Insecure Permissions on Dump Archive via vikunja dump
CVE-2026-123512	6.1 MEDIUM	Vikunja before 2.7.1 Sensitive Token Exposure via URL Query in Access Logs
CVE-2026-123530	5.9 MEDIUM	Vikunja before 2.7.1 Missing Step-Up Authentication via TOTP Enrollment Endpoints
CVE-2026-123499	5.9 MEDIUM	Vikunja veans before 2.7.1 Credential Leak via Repo-Controlled .veans.yml Server
CVE-2026-123521	5.9 MEDIUM	Vikunja before 2.7.1 Password Brute-Force via TOTP Disable Endpoint
CVE-2026-123524	5.7 MEDIUM	Vikunja 0.23.0 before 2.7.1 Information Disclosure via Webhook related_tasks Payload
CVE-2026-123505	5.5 MEDIUM	Vikunja before 2.7.1 World-Readable Local File Storage and SQLite Database
CVE-2026-123526	5.4 MEDIUM	Vikunja before 2.7.1 Mass Assignment via Team external_id Field
CVE-2026-123506	5.4 MEDIUM	Vikunja 2.2.0 before 2.7.1 Token Scope Bypass via Project Webhook Endpoints
CVE-2026-123493	5.4 MEDIUM	Vikunja from 2.4.0 before 2.7.1 Authentication Bypass via Bot API Tokens
CVE-2026-123503	5.4 MEDIUM	Vikunja before 2.7.1 Improper Authorization in Kanban Bucket Deletion

Showing top 20 of 39 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: vikunja

Same vendor: go-vikunja

Same weakness: CWE-770