Bug 2427830

Summary:	CVE-2026-22184 tcl: zlib: Arbitrary code execution via buffer overflow in untgz utility [fedora-43]
Product:	[Fedora] Fedora	Reporter:	Sandipan Roy <saroy>
Component:	tcl	Assignee:	Jaroslav Škarvada <jskarvad>
Status:	CLOSED UPSTREAM	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	43	CC:	jskarvad
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
URL:	https://core.tcl-lang.org/tcl/tktview/0b9367a240
Whiteboard:	{"flaws": ["22c8540b-4d7b-47e6-940f-04ad54ca4373"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-01-26 14:58:52 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:	2427688

Description Sandipan Roy 2026-01-08 06:55:43 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.

The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams

Comment 1 Jaroslav Škarvada 2026-01-26 14:55:23 UTC

The untgz binary isn't built nor shipped in fedora. The example source code is shipped only in the SRPM. Notified upstream:
https://core.tcl-lang.org/tcl/tktview/0b9367a240

I.e. now it's only problem if the user explicitly builds the insecure binary from the example code in SRPM by hand.

Comment 2 Jaroslav Škarvada 2026-01-26 14:58:52 UTC

Closing as upstream.