CVE-2026-63091: proftpd proftpd

ProFTPD mod_sftp Signed Integer Overflow via SCP Size-Record Parser

CVSS 7.1 HighEPSS 0.0053 · 44th percentile

Published by the CVE Program (CNA: VulnCheck) at 20 Jul 2026, 14:22 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
proftpd	proftpd	affected before 1.3.9c custom affected 1.3.10rc1 to before 1.3.10rc3 custom Other versions: affected

Identifiers

CVE-2026-63091

CNA

VulnCheck

Weakness (CWE)

CWE-126 · CWE-190

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.1	High	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	CNA (VulnCheck)Used for this record
6.5	Medium	3.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0053, the 44th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 20 Jul 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/proftpd/proftpd/blob/master/RELEASE_NOTES release-notes
github.com/proftpd/proftpd/releases/tag/v1.3.10rc3-3 patchrelease-notes
github.com/proftpd/proftpd/releases/tag/v1.3.9c patchrelease-notes
github.com/proftpd/proftpd/pull/2201 issue-trackingpatch
github.com/proftpd/proftpd/commit/b9b7dde1bcd74bc23366484d53856b67b8d6d95e patch
www.vulncheck.com/advisories/proftpd-mod-sftp-signed-integer-overflow-via-scp-size-record-parser third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.