CVE-2025-58181 — x/crypto
MEDIUMCVE-2025-58181 is a medium-severity (CVSS 5.3) CWE-770 vulnerability in golang.org/x/crypto. A fix is available for golang.org/x/crypto — see the affected versions and patch details below.
Unbounded memory consumption in golang.org/x/crypto/ssh
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2025-58181.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
golang.org/x/cryptoReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
SSH servers parsing GSSAPI authentication requests do not validate the number of mechanisms specified in the request, allowing an attacker to cause unbounded memory consumption.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | golang.org/x/crypto | all versions | 0.45.0go get golang.org/x/crypto@v0.45.0 |
Affected Products
cryptogolangDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for golang.org/x/crypto, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update golang.org/x/crypto to 0.45.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-58181 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
This vulnerability is rated Moderate for Red Hat. SSH servers utilizing `golang.org/x/crypto/ssh` and configured to process GSSAPI authentication requests are susceptible to unbounded memory consumption. An attacker can exploit this by sending specially crafted GSSAPI authentication requests, potentially leading to a…
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.Source: Red Hat security advisory for CVE-2025-58181 (CC BY 4.0)
| Product | Fixed in | Advisory |
|---|---|---|
| Cert Manager support for Red Hat OpenShift release 1.17 | cert-manager/jetstack-cert-manager-acmesolver-rhel9:1791371080 | RHSA-2026:82304 |
| Cert Manager support for Red Hat OpenShift release 1.17 | cert-manager/cert-manager-operator-rhel9:1791788287 | RHSA-2026:82322 |
| Cert Manager support for Red Hat OpenShift release 1.18 | cert-manager/cert-manager-istio-csr-rhel9:1791459759 | RHSA-2026:82354 |
| OpenShift API for Data Protection 1.6 | oadp/oadp-velero-rhel9:1784058822 | RHSA-2026:43692 |
| Red Hat Ceph Storage 7.1 | rhceph/grafana-rhel9:1791450715 | RHSA-2026:83548 |
| Red Hat Ceph Storage 8.1 | rhceph/grafana-rhel9:1777566546 | RHSA-2026:15979 |
| Red Hat Ceph Storage 9.0 | rhceph/grafana-rhel10:1781018768 | RHSA-2026:26411 |
| Red Hat Hardened Images | golang1-26-main-1.26.2-1.hum1 | RHSA-2026:7291 |
Frequently Asked Questions
Is CVE-2025-58181 in your dependencies?
Find it across Go, including transitive dependencies.