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CVE-2026-108981

Quick assessment

Affected
denji ngx_cache_purge
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.

在 nginx 和所服务的某个应用程序（例如 WordPress）以同一用户身份运行的特定情况下，ngx_cache_purge 模块（版本低于 3.0.4）存在通过符号链接（symlink）攻击实现文件删除的风险。攻击者必须能够在缓存路径中创建符号链接。 版本 3.0.4 修复了由在任意先前时间创建的符号链接引发的问题，但未能解决一个适用的时间戳检查到使用（TOCTOU）竞态条件。 （原因分析：ngx_cache_purge 模块在执行清理操作、遍历缓存目录树时，会跟随符号链接。该模块依赖于 nginx 的 ng

CVSS 3.6 · Low EPSS 0.12% · P2

Affected Version Matrix 2

VendorProduct Version RangeStatus
denji ngx_cache_purge 2.4.0≤ 2.5.6 affected
3.0.0< 3.0.4 affected
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I. Basic Information for CVE-2026-108981

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
ngx_cache_purge before 3.0.4 can allow file deletion via a symlink attack in certain situations where nginx and a served application (e.g., WordPress) run under the same user account. The attacker must be able to create a symlink inside the cache path. Version 3.0.4 fixes this for the case of a symlink created at an arbitrary earlier time, but does not resolve an applicable TOCTOU race condition. (The ngx_cache_purge module follows symlinks while walking the cache directory tree during purge operations. The module relies on nginx's ngx_walk_tree(), which relies on stat() and therefore follows symlinks.)
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
denji ngx_cache_purge 2.4.0 ~ 2.5.6 -

II. Public POCs for CVE-2026-108981

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III. Intelligence Information for CVE-2026-108981

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Patches & Fixes for CVE-2026-108981 (2)

Vendor Pages for CVE-2026-108981 (1)

IV. Related Vulnerabilities

Same weakness: CWE-61

V. Comments for CVE-2026-108981

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