PT-2026-56240 · Gnuwget · Wget

Tristan Madani · Published 2026-07-07 · Updated 2026-07-07 · CVE-2026-58471

Mitre

CVSS v3.1

5.9

Medium

Base vector

AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H

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.

Fix

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

CVE-2026-58471

Affected Products

Wget

References · 3

• https://gitlab.com/gnuwget/wget/-/commit/c2640fe5171c59f87c58dc9fcb195b2d18b010ee · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-58471 · Security Note
• https://vulncheck.com/advisories/gnu-wget-heap-buffer-overflow-via-convert-fname-in-url-c · Note