CVE-2026-21876

Katalog CVE

CVSS 5.3 · Medium EPSS 17,9%

Kerentanan Incomplete Filtering of Multiple Instances of Special Elements pada owasp modsecurity core rule set. Skor CVSS 3.1 5.3 (Medium) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

8 Januari 2026

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

5.3 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-794: Incomplete Filtering of Multiple Instances of Special Elements

EPSS (30 hari)

17,9% peluang dieksploitasi; lebih tinggi dari 97,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/coreruleset/coreruleset/security/advisories/GHSA-36fv-25j3-r2c5 exploit · advisory vendor
• https://github.com/coreruleset/coreruleset/commit/80d80473abf71bd49bf6d3c1ab221e3c74e4eb83 patch
• https://github.com/coreruleset/coreruleset/commit/9917985de09a6cf38b3261faf9105e909d67a7d6 patch
• https://github.com/coreruleset/coreruleset/releases/tag/v3.3.8 product · release notes
• https://github.com/coreruleset/coreruleset/releases/tag/v4.22.0 product · release notes
• https://github.com/daytriftnewgen/CVE-2026-21876