GNU Wget 1.25.0 Heap Buffer Overflow (convert_fname)
CVE-2026-58471 Published on July 7, 2026
GNU Wget 1.25.0 Heap Buffer Overflow via convert_fname() in url.c
GNU Wget through 1.25.0, fixed in commit c2640fe, contains a heap buffer overflow vulnerability in the convert_fname() function within src/url.c that allows remote attackers to trigger memory corruption through a server-supplied filename requiring character set conversion. When the output buffer is too small during iconv E2BIG reallocation, the reallocation logic miscalculates the remaining space, leading to a heap buffer overflow that can be exploited via a maliciously crafted server response.
Vulnerability Analysis
CVE-2026-58471 can be exploited with network access, requires user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and a high impact on availability.
Weakness Type
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Products Associated with CVE-2026-58471
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Affected Versions
gnuwget wget:- Before and including 1.25.0 is affected.
- Version c2640fe5171c59f87c58dc9fcb195b2d18b010ee is unaffected.