Bug 2494238 - CVE-2026-27145 betterleaks: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries [epel-all]
Summary: CVE-2026-27145 betterleaks: golang crypto/x509: Denial of Service via excessi...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora EPEL
Classification: Fedora
Component: betterleaks
Version: epel10
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Mikel Olasagasti Uranga
QA Contact:
URL:
Whiteboard: {"flaws": ["1765a0c8-adb1-4223-88bf-d...
Depends On:
Blocks: CVE-2026-27145
TreeView+ depends on / blocked
 
Reported: 2026-06-29 14:13 UTC by jkelly
Modified: 2026-08-04 00:50 UTC (History)
2 users (show)

Fixed In Version: betterleaks-1.7.0-2.el10_3 betterleaks-1.7.0-2.el10_2 betterleaks-1.7.0-2.el9
Clone Of:
Environment:
Last Closed: 2026-08-04 00:26:16 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description jkelly 2026-06-29 14:13:39 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 2026-07-26 20:32:16 UTC
FEDORA-EPEL-2026-8c7f34abe0 (betterleaks-1.7.0-2.el10_3) has been submitted as an update to Fedora EPEL 10.3.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-8c7f34abe0

Comment 2 Fedora Update System 2026-07-27 01:00:32 UTC
FEDORA-EPEL-2026-8c7f34abe0 has been pushed to the Fedora EPEL 10.3 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-8c7f34abe0

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

Comment 3 Fedora Update System 2026-07-27 01:18:20 UTC
FEDORA-EPEL-2026-33afcba8b1 has been pushed to the Fedora EPEL 10.2 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-33afcba8b1

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

Comment 4 Fedora Update System 2026-07-27 01:23:37 UTC
FEDORA-EPEL-2026-276b2f5cdc has been pushed to the Fedora EPEL 9 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-276b2f5cdc

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

Comment 5 Fedora Update System 2026-08-04 00:26:16 UTC
FEDORA-EPEL-2026-8c7f34abe0 (betterleaks-1.7.0-2.el10_3) has been pushed to the Fedora EPEL 10.3 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 6 Fedora Update System 2026-08-04 00:38:20 UTC
FEDORA-EPEL-2026-33afcba8b1 (betterleaks-1.7.0-2.el10_2) has been pushed to the Fedora EPEL 10.2 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 7 Fedora Update System 2026-08-04 00:50:31 UTC
FEDORA-EPEL-2026-276b2f5cdc (betterleaks-1.7.0-2.el9) has been pushed to the Fedora EPEL 9 stable repository.
If problem still persists, please make note of it in this bug report.


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