Bug 2496819

Summary:	CVE-2026-20215 clamav: ClamAV: Denial of Service via crafted 7z file [epel-all]
Product:	[Fedora] Fedora EPEL	Reporter:	Srikanth Balasubramanian <sbalasub>
Component:	clamav	Assignee:	Orion Poplawski <orion>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	epel10	CC:	anon.amish, bennie.joubert, Christopher.leinbach, gk, gwync, j, lee.jnk, ondrejj, orion, rh-bugzilla, steve
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["a98a7a86-7f34-4168-9328-d4881a8b80dd"]}
Fixed In Version:	clamav-1.4.6-1.fc44 clamav-1.4.6-1.el9 clamav-1.4.6-1.el8 clamav-1.4.6-1.fc43 clamav-1.4.6-1.el10_3	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-08-12 00:48:01 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:	2496105

Description Srikanth Balasubramanian 2026-07-03 12:34:40 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.

A vulnerability in the 7z file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device.

This vulnerability is due to improper boundary checks for content in 7z files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains 7z&nbsp;content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

Comment 1 Fedora Update System 2026-08-10 15:57:54 UTC

FEDORA-2026-ecf6fe868f (clamav-1.4.6-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-ecf6fe868f

Comment 2 Fedora Update System 2026-08-11 01:20:51 UTC

FEDORA-EPEL-2026-b873ec0e0b has been pushed to the Fedora EPEL 10.3 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-b873ec0e0b

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

Comment 3 Fedora Update System 2026-08-11 01:28:05 UTC

FEDORA-EPEL-2026-e14bc659f0 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-e14bc659f0

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

Comment 4 Fedora Update System 2026-08-11 03:16:48 UTC

FEDORA-EPEL-2026-3432a047a4 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-2026-3432a047a4

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

Comment 5 Fedora Update System 2026-08-11 03:38:09 UTC

FEDORA-2026-ecf6fe868f has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-ecf6fe868f`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-ecf6fe868f

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

Comment 6 Fedora Update System 2026-08-11 03:57:13 UTC

FEDORA-2026-a9beec8485 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-a9beec8485`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-a9beec8485

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

Comment 7 Fedora Update System 2026-08-12 00:48:01 UTC

FEDORA-2026-ecf6fe868f (clamav-1.4.6-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-08-12 00:58:16 UTC

FEDORA-EPEL-2026-e14bc659f0 (clamav-1.4.6-1.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 9 Fedora Update System 2026-08-12 00:58:26 UTC

FEDORA-EPEL-2026-3432a047a4 (clamav-1.4.6-1.el8) has been pushed to the Fedora EPEL 8 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 10 Fedora Update System 2026-08-12 01:10:51 UTC

FEDORA-2026-a9beec8485 (clamav-1.4.6-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 11 Fedora Update System 2026-08-19 00:26:20 UTC

FEDORA-EPEL-2026-b873ec0e0b (clamav-1.4.6-1.el10_3) has been pushed to the Fedora EPEL 10.3 stable repository.
If problem still persists, please make note of it in this bug report.