Bug 2559470

Summary: CVE-2026-111497 brotli: Out-of-Bounds Write in Google Brotli Decoder [fedora-43]
Product: [Fedora] Fedora Reporter: Srikanth Balasubramanian <sbalasub>
Component: brotliAssignee: Jonathan Wright <jonathan>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: 43CC: carlwgeorge, jonathan, pnemade, pouar, tagoh
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["e952c9d9-471d-4c9c-9b03-af60a2ac341b"]}
Fixed In Version: brotli-1.2.1-1.fc43 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-10-30 01:32:56 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: 2558973    

Description Srikanth Balasubramanian 2026-10-23 06:52:24 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 buffer overflow vulnerability in the Brotli decoder (c/dec/decode.c) in Google Brotli versions 1.0.3 through 1.2.0 on all platforms allows a remote unauthenticated attacker to corrupt adjacent decoder state memory, disclose sensitive memory contents, cause a denial of service, or potentially execute arbitrary code using a crafted Brotli-compressed stream.





Users need to update any Brotli libraries or binaries between 1.0.3 through 1.2.0 to the latest available version: 1.0.10 or 1.1.1 or 1.2.1.
Comment 1 Fedora Update System 2026-10-26 12:16:07 UTC 
FEDORA-2026-4aade61415 (brotli-1.2.1-1.fc43 and perl-Alien-Brotli-0.2.2-12.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-4aade61415
Comment 2 Fedora Update System 2026-10-27 02:49:04 UTC 
FEDORA-2026-4aade61415 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-2026-4aade61415`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-4aade61415

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 3 Fedora Update System 2026-10-30 01:32:56 UTC 
FEDORA-2026-4aade61415 (brotli-1.2.1-1.fc43 and perl-Alien-Brotli-0.2.2-12.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.