Bug 2494316 - CVE-2026-27145 ipp-usb: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries [fedora-all]
Summary: CVE-2026-27145 ipp-usb: golang crypto/x509: Denial of Service via excessive p...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: ipp-usb
Version: rawhide
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Zdenek Dohnal
QA Contact:
URL:
Whiteboard: {"flaws": ["1765a0c8-adb1-4223-88bf-d...
Depends On:
Blocks: CVE-2026-27145
TreeView+ depends on / blocked
 
Reported: 2026-06-29 14:21 UTC by jkelly
Modified: 2026-07-02 01:10 UTC (History)
2 users (show)

Fixed In Version: ipp-usb-0.9.34-2.fc45 ipp-usb-0.9.34-2.fc44
Clone Of:
Environment:
Last Closed: 2026-06-30 19:31:22 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description jkelly 2026-06-29 14:21:36 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.

(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of SAN entries multiplied by the hostname's label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates.

Comment 1 Fedora Update System 2026-06-30 14:56:46 UTC
FEDORA-2026-7eaf5e3510 (ipp-usb-0.9.34-2.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-7eaf5e3510

Comment 2 Fedora Update System 2026-06-30 15:03:13 UTC
FEDORA-2026-00901a5e8f (ipp-usb-0.9.34-2.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-00901a5e8f

Comment 3 Fedora Update System 2026-06-30 19:31:22 UTC
FEDORA-2026-7eaf5e3510 (ipp-usb-0.9.34-2.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 4 Fedora Update System 2026-07-01 00:49:27 UTC
FEDORA-2026-00901a5e8f 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-2026-00901a5e8f`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-00901a5e8f

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

Comment 5 Fedora Update System 2026-07-02 01:10:52 UTC
FEDORA-2026-00901a5e8f (ipp-usb-0.9.34-2.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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