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CVE-2026-80256 is a Windows-only path traversal vulnerability in wcurl. wcurl percent-decodes output filenames, including percent-encoded backslashes. An attacker-controlled output filename can therefore introduce Windows directory separators after decoding and cause a newly created file to be written outside the directory selected by the user. The behavior affects wcurl bundled with curl 8.14.0 through 8.21.0 and standalone wcurl 2024.12.08 through 2026.01.05.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A backslash-bypass vulnerability in wcurl addressed in this release.
A medium-severity Windows-only path-traversal flaw in wcurl. Percent-decoded backslashes in an output filename can cause creation of an attacker-controlled new file outside the user-selected working directory, subject to the user's filesystem permissions and provided the target file does not already exist.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.