Bug 2502963

Summary:	CVE-2026-63090 proftpd: heap buffer overflow via SFTP packet reassembly [epel-all]
Product:	[Fedora] Fedora EPEL	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	proftpd	Assignee:	Paul Howarth <paul>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	epel10	CC:	paul
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["07c50644-fa09-42ee-91b0-fd92e990d0bd"]}
Fixed In Version:	proftpd-1.3.8d-4.el9 proftpd-1.3.6e-11.el8	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-08-06 00:32:53 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2502836

Description Guilherme de Almeida Suckevicz 2026-07-20 19:21:32 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.

Comment 1 Fedora Update System 2026-07-28 18:35:18 UTC

FEDORA-EPEL-2026-cbb4ce3efc (proftpd-1.3.6e-11.el8) has been submitted as an update to Fedora EPEL 8.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-cbb4ce3efc

Comment 2 Fedora Update System 2026-07-28 18:35:26 UTC

FEDORA-EPEL-2026-daf1e2cc13 (proftpd-1.3.8d-4.el9) has been submitted as an update to Fedora EPEL 9.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-daf1e2cc13

Comment 3 Fedora Update System 2026-07-29 01:04:27 UTC

FEDORA-EPEL-2026-daf1e2cc13 has been pushed to the Fedora EPEL 9 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-daf1e2cc13

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-07-29 01:19:36 UTC

FEDORA-EPEL-2026-cbb4ce3efc has been pushed to the Fedora EPEL 8 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-cbb4ce3efc

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-08-06 00:32:53 UTC

FEDORA-EPEL-2026-daf1e2cc13 (proftpd-1.3.8d-4.el9) has been pushed to the Fedora EPEL 9 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 6 Fedora Update System 2026-08-06 00:44:37 UTC

FEDORA-EPEL-2026-cbb4ce3efc (proftpd-1.3.6e-11.el8) has been pushed to the Fedora EPEL 8 stable repository.
If problem still persists, please make note of it in this bug report.