CVE-2026-116844

medium

Fclairamb ftpserverlib through 0.32.4 contains a cleartext transmission vulnerability because TransferOpen checks only the transferTLS flag set by PROT, not wh…

Fclairamb ftpserverlib through 0.32.4 contains a cleartext transmission vulnerability because TransferOpen checks only the transferTLS flag set by PROT, not whether the prepared data connection uses TLS. When a client sends PROT P after PASV or PORT, file contents and directory listings cross the network unencrypted, even with mandatory encryption, letting on-path attackers read or modify them.

CVSS

4.8

4.8 (CVSS v3.1)

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

Severity source: NVD CVSS v3.1 (disclosure@vulncheck.com)

Timeline (UTC)

Published: 2026-10-27 01:19

Modified: 2026-10-29 11:17

NVD status: Deferred

Last synced 7 hours ago

Verified against the source API 2026-10-29 11:33 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

Not reported by the source (unknown — not "none").

Weakness classification (CWE)

CWE-319

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

No vendor advisory or patch reference tagged by NVD. Check the references below.

References

https://github.com/fclairamb/ftpserverlib/blob/v0.32.4/client_handler.go#L720 disclosure@vulncheck.com
https://github.com/fclairamb/ftpserverlib/blob/v0.32.4/handle_misc.go#L29-L31 disclosure@vulncheck.com
https://github.com/fclairamb/ftpserverlib/pull/685 disclosure@vulncheck.com
https://www.vulncheck.com/advisories/fclairamb-ftpserverlib-through-0.32.4-cleartext-ftpes... disclosure@vulncheck.com

Data sources

NVD CVE API 2.0 — fetched 2026-10-29 11:33 UTC · record ↗

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