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Description

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.

PUBLISHED Reserved 2026-06-30 | Published 2026-07-07 | Updated 2026-07-14 | Assigner VulnCheck




MEDIUM: 6.0CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

MEDIUM: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H

Problem types

Heap-based Buffer Overflow

Product status

Default status
affected

Any version
affected

c2640fe5171c59f87c58dc9fcb195b2d18b010ee (git)
unaffected

Credits

Tristan Madani finder

Arkadi Vainbrand finder

References

gitlab.com/...ommit/c2640fe5171c59f87c58dc9fcb195b2d18b010ee (Fix Commit) patch

www.vulncheck.com/...fer-overflow-via-convert-fname-in-url-c third-party-advisory

cve.org (CVE-2026-58471)

nvd.nist.gov (CVE-2026-58471)

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