Integer Overflow in GNU Wget via Malicious Content-Range Header

Publication date: 2026-07-07

Last updated on: 2026-07-07

Assigner: VulnCheck

Description

GNU Wget through 1.25.0, fixed in commit 43d3ba9, contains an integer overflow vulnerability in the parse_content_range() function within src/http.c that allows server-controlled values to cause signed integer arithmetic to overflow. Attackers can supply malicious Content-Range header values to trigger undefined behavior and download desynchronization in the affected client.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-07-07

Last Modified

2026-07-07

Generated

2026-07-08

AI Q&A

2026-07-08

EPSS Evaluated

N/A

NVD

CVE-2026-58470

Affected Vendors & Products

Vendor	Product	Version / Range
gnu	wget	1.25.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Attack-Flow Graph

Executive Summary

This vulnerability exists in GNU Wget versions up to 1.25.0 in the parse_content_range() function located in src/http.c. It is an integer overflow issue caused by server-controlled values in the Content-Range header. Malicious servers can supply specially crafted Content-Range headers that trigger signed integer arithmetic overflow, leading to undefined behavior and download desynchronization in the affected client.

Impact Analysis

The impact of this vulnerability is that an attacker controlling a server can cause the Wget client to behave unpredictably by exploiting the integer overflow. This can result in download desynchronization, potentially causing corrupted or incomplete downloads. While it does not directly lead to code execution or data disclosure, it can disrupt normal file retrieval processes.

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