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CVE-2026-118485— Axel Download Accelerator Path Traversal via URL Filename Decoding

Quick assessment

Affected
Axel Download Accelerator Axel
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.

Axel 下载加速器 2.17.14 及更早版本在解析 URL 并提取文件名组件后，对输出文件名执行了 URL 百分号解码（http_decode()）。这使得攻击者能够在 URL 路径中嵌入经过 URL 编码的目录遍历序列 %2e%2e%2f（即 ../）。这些序列在 URL 解析过程中保持原样（因为它们不包含字面意义上的 "/" 字符），但在写入输出文件之前被解码为目录遍历序列。因此，精心构造的 URL 可诱导 Axel 将下载内容写入相对于当前工作目录的任意文件系统路径。

CVSS 8.1 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
Axel Download Accelerator Axel ≤ 2.17.14 affected
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I. Basic Information for CVE-2026-118485

Vulnerability Information
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Vulnerability Title
Axel Download Accelerator Path Traversal via URL Filename Decoding
Source: CVE Program / CVE List V5
Vulnerability Description
Axel Download Accelerator 2.17.14 and earlier performs URL percent-decoding (http_decode()) on the output filename after the URL has been parsed and the filename component extracted. This allows an attacker to embed %2e%2e%2f (URL-encoded ../) sequences in the URL path. These sequences survive the URL parser intact (they contain no literal / characters) but are decoded into directory traversal sequences before the output file is opened for writing. As a result, a crafted URL can cause axel to write downloaded content to arbitrary filesystem paths relative to the current working directory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
路径遍历：’../filedir’
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Axel Download Accelerator Axel 0 ~ 2.17.14 -

II. Public POCs for CVE-2026-118485

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III. Intelligence Information for CVE-2026-118485

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Patches & Fixes for CVE-2026-118485 (1)

Vendor Advisories for CVE-2026-118485 (2)

Vendor Pages for CVE-2026-118485 (1)

IV. Related Vulnerabilities

Same weakness: CWE-24