Fedora 42 alertmanager Critical Denial Of Service Vulnerability Report
fedora
March 15, 2026
Initial build after rename and update to 0.31.1
Summary
The Alertmanager handles alerts sent by client applications such as the
Prometheus server. It takes care of deduplicating, grouping, and routing them to
the correct receiver integrations such as email, PagerDuty, or OpsGenie. It also
takes care of silencing and inhibition of alerts.
Update Information:
Initial build after rename and update to 0.31.1
Change Log
* Fri Mar 6 2026 Mikel Olasagasti Uranga
References
[ 1 ] Bug #2398777 - CVE-2025-47910 golang-github-prometheus-alertmanager: CrossOriginProtection bypass in net/http [fedora-42]
https://bugzilla.redhat.com/show_bug.cgi?id=2398777
[ 2 ] Bug #2399448 - CVE-2025-47906 golang-github-prometheus-alertmanager: Unexpected paths returned from LookPath in os/exec [fedora-42]
https://bugzilla.redhat.com/show_bug.cgi?id=2399448
[ 3 ] Bug #2407978 - CVE-2025-58189 golang-github-prometheus-alertmanager: go crypto/tls ALPN negotiation error contains attacker controlled information [fedora-42]
https://bugzilla.redhat.com/show_bug.cgi?id=2407978
[ 4 ] Bug #2408653 - CVE-2025-61725 golang-github-prometheus-alertmanager: Excessive CPU consumption in ParseAddress in net/mail [fedora-42]
https://bugzilla.redhat.com/show_bug.cgi?id=2408653
[ 5 ] Bug #2409448 - CVE-2025-61723 golang-github-prometheus-alertmanager: Quadratic complexity when parsing some invalid inputs in encoding/pem [fedora-42]
h...
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-83937af369' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label
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Severity
critical
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Critical
Name: alertmanager
Product: Fedora 42
Version: 0.31.1
Release: 2.fc42
Summary: Prometheus Alertmanager
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