CVE-2021-43843

Katalog CVE

CVSS 7.5 · High EPSS 2,0%

Kerentanan Uncontrolled Resource Consumption pada jsx-slack project jsx-slack. Skor CVSS 3.1 7.5 (High) menurut NVD.

Deskripsi (NVD)

jsx-slack is a package for building JSON objects for Slack block kit surfaces from JSX. The maintainers found the patch for CVE-2021-43838 in jsx-slack v4.5.1 is insufficient tfor protection from a Regular Expression Denial of Service (ReDoS) attack. If an attacker can put a lot of JSX elements into `<blockquote>` tag _with including multibyte characters_, an internal regular expression for escaping characters may consume an excessive amount of computing resources. v4.5.1 passes the test against ASCII characters but misses the case of multibyte characters. jsx-slack v4.5.2 has updated regular expressions for escaping blockquote characters to prevent catastrophic backtracking. It is also including an updated test case to confirm rendering multiple tags in `<blockquote>` with multibyte characters.

Rincian

Terbit di NVD

20 Desember 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-400: Uncontrolled Resource Consumption
CWE-1333: Inefficient Regular Expression Complexity

EPSS (30 hari)

2,0% peluang dieksploitasi; lebih tinggi dari 79,9% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/yhatt/jsx-slack/commit/46bc88391d89d5fda4ce689e18ca080bcdd29ecc patch · advisory pihak ketiga
• https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q exploit · patch · advisory pihak ketiga
• https://github.com/yhatt/jsx-slack/security/advisories/GHSA-hp68-xhvj-x6j6 exploit · patch · advisory pihak ketiga
• https://github.com/yhatt/jsx-slack/releases/tag/v4.5.2 release notes · advisory pihak ketiga