Bug 2539414 - CVE-2026-94055 exim: Exim: Use-after-free vulnerability in GnuTLS TLS settings leading to denial of service [fedora-all]
Summary: CVE-2026-94055 exim: Exim: Use-after-free vulnerability in GnuTLS TLS setting...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: exim
Version: rawhide
Hardware: Unspecified
OS: Unspecified
low
low
Target Milestone: ---
Assignee: David Woodhouse
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["9f7ab2fb-2298-4aba-af65-e...
Depends On:
Blocks: CVE-2026-94055
TreeView+ depends on / blocked
 
Reported: 2026-09-23 13:53 UTC by Jon Weiser
Modified: 2026-10-15 01:31 UTC (History)
4 users (show)

Fixed In Version: exim-4.100.1-1.fc43 exim-4.100.1-1.fc44
Clone Of:
Environment:
Last Closed: 2026-10-15 01:08:32 UTC
Type: ---
Embargoed:

Attachments (Terms of Use)

Description Jon Weiser 2026-09-23 13:53:36 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 certain non-default TLS settings are used with GnuTLS, has a use-after-free.
Comment 1 Fedora Update System 2026-10-06 15:23:23 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 15:37:31 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 15:39:04 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 01:59:54 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 02:28:14 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 02:42:13 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.
Comment 7 Fedora Update System 2026-10-15 01:08:32 UTC 
FEDORA-2026-d202b74c6a (exim-4.100.1-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.
Comment 8 Fedora Update System 2026-10-15 01:31:28 UTC 
FEDORA-2026-4f9e436ed5 (exim-4.100.1-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.
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