High severity8.8NVD Advisory· Published Jul 20, 2026· Updated Jul 30, 2026
CVE-2026-63090
CVE-2026-63090
Description
ProFTPD before 1.3.9c and 1.3.10rc3 contains a heap-based buffer overflow vulnerability in the mod_sftp module that allows authenticated low-privilege attackers to achieve arbitrary code execution by sending crafted SFTP packet fragments exceeding the 16 KB reassembly buffer in the fxp.c component. Attackers can supply oversized fragments to trigger an incorrectly conditioned reallocation, corrupt pool freelist metadata, overwrite the root_fs BSS global pointer to reference a fake filesystem struct, and redirect pr_fsio_stat() to system() via a crafted RENAME request.
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Affected products
4Patches
Vulnerability mechanics
References
6- github.com/proftpd/proftpd/commit/4ee8701bcf425f11b3b2116e634ff3e655d918b1nvdPatch
- www.vulncheck.com/advisories/proftpd-mod-sftp-heap-buffer-overflow-via-sftp-packet-reassemblynvdThird Party AdvisoryPatchRelease Notes
- github.com/proftpd/proftpd/blob/master/RELEASE_NOTESnvdRelease Notes
- github.com/proftpd/proftpd/issues/2190nvdIssue Tracking
- github.com/proftpd/proftpd/releases/tag/v1.3.10rc3-3nvdProductRelease Notes
- github.com/proftpd/proftpd/releases/tag/v1.3.9cnvdProductRelease Notes
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