Buffer overflow in GNU Wget
CVE-2026-58471
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 class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H.
EPSS exploit prediction
EPSS: 0.004 (30.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
- GNU Wget
- Gnuwget Wget — versions 0, c2640fe5171c59f87c58dc9fcb195b2d18b010ee
Weakness classification (CWE)
References
- gitlab.com/gnuwget/wget/-/commit/c2640fe5171c59f87c58dc9fcb195b2d18b010ee (Patch, patch)
- www.vulncheck.com/advisories/gnu-wget-heap-buffer-overflow-via-convert-fname-in… (Patch, Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-58471?
- CVE-2026-58471 is a medium-severity vulnerability in GNU Wget, classified under Heap-based Buffer Overflow. CVSS score: 5.9/10. Published 2026-07-07.
- How severe is CVE-2026-58471?
- Medium severity. CVSS v3 base score is 5.9 out of 10.