CVE-2026-21876
modsecurity-crs - security update
5.3
MEDIUM
CVSS 3.1
EPSS 13.1%
描述
The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.
如何修補 CVE-2026-21876
要修補 CVE-2026-21876,請將受影響套件升級到下列已修補版本。
- —升級至 3.3.4-1~deb11u2 或更新版本
- —升級至 3.3.4-1+deb12u1 或更新版本
CVE-2026-21876 正在被利用嗎?
中等 — EPSS 為 13.1%,可持續追蹤但非最高優先。
受影響套件(2)
- from 0, < 3.3.4-1~deb11u2
- from 0, < 3.3.4-1+deb12u1
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |