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CVE-2026-102473— Dash: dash: super-polynomial backtracking in pmatch when libc fnmatch is disabled

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 6
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 dash 中发现了一个缺陷。当 dash 在没有 libc 的 fnmatch 函数支持下编译时，其内部的 pmatch() 匹配器通过针对候选位置的无限制递归来实现通配符 的匹配。能够植入文件名或以其他方式向该匹配器输入数据的本地用户，可以利用一个简短的多星号模式（例如 .....tar.gz）导致系统过度消耗 CPU 资源。

CVSS 5.5 · Medium
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I. Basic Information for CVE-2026-102473

Vulnerability Information
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Vulnerability Title
Dash: dash: super-polynomial backtracking in pmatch when libc fnmatch is disabled
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in dash. When built without libc fnmatch, the internal pmatch() matcher implements * by unbounded recursion over candidate positions. A local user who can plant filenames, or otherwise feed that matcher, can make a short multi-star pattern such as *.*.*.*.*.tar.gz consume excessive CPU.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6

II. Public POCs for CVE-2026-102473

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III. Intelligence Information for CVE-2026-102473

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Vendor Advisories for CVE-2026-102473 (2)

Same Patch Batch · Red Hat · 2026-09-29 · 5 CVEs total

CVE-2026-95520 7.1 HIGH Rpm: rpm: integer overflow in iterreadarchivenext() leads to heap-based buffer overflow wh
CVE-2026-97024 7.1 HIGH Flatpak: flatpak: arbitrary write in root context via path traversal in deploy directory f
CVE-2026-97029 5.7 MEDIUM Flatpak: flatpak: sandboxed app can signal unsandboxed processes in the same process group
CVE-2026-102474 4.0 MEDIUM Dash: dash: heap out-of-bounds write in conv_escape via undersized unicode escape reservat

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 6
Same vendor: Red Hat
Same weakness: CWE-1333

V. Comments for CVE-2026-102473

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