Bug 2539249

Summary: CVE-2026-94054 exim: Exim: Arbitrary code execution via attacker-controlled Proxy-Protocol [fedora-all]
Product: [Fedora] Fedora Reporter: Vladimir Vasilev <vvasilev>
Component: eximAssignee: David Woodhouse <dwmw2>
Status: ON_QA --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: bennie.joubert, dwmw2, jskarvad, martin.fraenzl
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["2c5ee259-eb31-4d1a-9073-41eda6dfe07b"]}
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
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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: 2538158    

Description Vladimir Vasilev 2026-09-23 09:03:42 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.

Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, has an out-of-bounds write.

Comment 1 Fedora Update System 2026-10-06 15:23:14 UTC
FEDORA-2026-3f88ddbd83 (exim-4.100.1-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-3f88ddbd83

Comment 2 Fedora Update System 2026-10-06 15:37:22 UTC
FEDORA-2026-4f9e436ed5 (exim-4.100.1-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-4f9e436ed5

Comment 3 Fedora Update System 2026-10-06 15:38:56 UTC
FEDORA-2026-d202b74c6a (exim-4.100.1-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-d202b74c6a

Comment 4 Fedora Update System 2026-10-07 01:59:47 UTC
FEDORA-2026-3f88ddbd83 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-3f88ddbd83`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-3f88ddbd83

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

Comment 5 Fedora Update System 2026-10-07 02:28:07 UTC
FEDORA-2026-4f9e436ed5 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-2026-4f9e436ed5`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-4f9e436ed5

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

Comment 6 Fedora Update System 2026-10-07 02:42:07 UTC
FEDORA-2026-d202b74c6a 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-d202b74c6a`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-d202b74c6a

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