CVE-2026-58471 PUBLISHED

GNU Wget 1.25.0 Heap Buffer Overflow via convert_fname() in url.c

Assigner: VulnCheck
Reserved: 30.06.2026 Published: 07.07.2026 Updated: 07.07.2026

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.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
CVSS Score: 6

Product Status

Vendor gnuwget
Product wget
Versions Default: affected
  • affected from 0 to 1.25.0 (incl.)
  • Version c2640fe5171c59f87c58dc9fcb195b2d18b010ee is unaffected

Credits

  • Tristan Madani finder

References

Problem Types

  • Heap-based Buffer Overflow CWE