CVE-2025-47913 Potential denial of service in golang.org/x/crypto/ssh/agent
High 7.5
Published
Updated
Check this codebase for CVE-2025-47913 and fix it if it is affected.
What it is: CVE-2025-47913 is a high-severity denial of service vulnerability in golang.org/x/crypto/ssh/agent, published on 13 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-47913 in the wild and no public exploit code.
Affected packages and fixed versions:
- golang.org/x/crypto/ssh/agent (Go): affected all versions; fixed in 0.43.0
- golang.org/x/crypto/ssh/agent (Go): affected all versions; fixed in 0.43.0
- golang.org/x/crypto (Go): affected all versions; fixed in 0.43.0
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2025-47913/ (Markdown: https://insights.sbomify.com/CVE-2025-47913/index.md)
A malicious SSH agent can cause a client panic and termination by sending an unexpected success message, requiring a library upgrade.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-47913?
CVE-2025-47913 is a high-severity denial of service vulnerability in golang.org/x/crypto/ssh/agent, published on 13 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
SSH clients receiving SSH_AGENT_SUCCESS when expecting a typed response will panic and cause early termination of the client process.
Weakness: CWE-617
Which versions are affected by CVE-2025-47913?
3 open source packages ship an affected version, including golang.org/x/crypto/ssh/agent and golang.org/x/crypto. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
golang.org/x/crypto/ssh/agent Go | All versions | 0.43.0 |
golang.org/x/crypto/ssh/agent Go | All versions | 0.43.0 |
golang.org/x/crypto Go | All versions | 0.43.0 |
Linux distribution packages (37)
buildah AlmaLinux:10 | All versions | 2:1.41.8-1.el10_1 |
buildah-tests AlmaLinux:10 | All versions | 2:1.41.8-1.el10_1 |
podman-docker AlmaLinux:10 | All versions | 7:5.6.0-11.el10_1 |
aardvark-dns AlmaLinux:8 | All versions | 2:1.10.1-2.module_el8.10.0+3901+4b80ecd7 |
aardvark-dns AlmaLinux:8 | All versions | 2:1.10.1-2.module_el8.10.0+3909+6e1c1eb7 |
aardvark-dns AlmaLinux:8 | All versions | 2:1.10.1-2.module_el8.10.0+4047+545787c4 |
aardvark-dns AlmaLinux:8 | All versions | 2:1.10.1-2.module_el8.10.0+4089+ce72bbbe |
buildah AlmaLinux:8 | All versions | 2:1.33.14-1.module_el8.10.0+4102+6c76e544 |
buildah-tests AlmaLinux:8 | All versions | 2:1.33.14-1.module_el8.10.0+4102+6c76e544 |
cockpit-podman AlmaLinux:8 | All versions | 84.1-1.module_el8.10.0+4102+6c76e544 |
conmon AlmaLinux:8 | All versions | 3:2.1.10-1.module_el8.10.0+3970+8445edf6 |
conmon AlmaLinux:8 | All versions | 3:2.1.10-1.module_el8.10.0+4068+0e21408f |
conmon AlmaLinux:8 | All versions | 3:2.1.10-1.module_el8.10.0+4090+91932338 |
container-selinux AlmaLinux:8 | All versions | 2:2.229.0-2.module_el8.10.0+4090+91932338 |
containernetworking-plugins AlmaLinux:8 | All versions | 1:1.4.0-6.module_el8.10.0+4016+efd18bf8 |
containernetworking-plugins AlmaLinux:8 | All versions | 1:1.4.0-6.module_el8.10.0+4047+545787c4 |
containernetworking-plugins AlmaLinux:8 | All versions | 1:1.4.0-6.module_el8.10.0+4102+6c76e544 |
containers-common AlmaLinux:8 | All versions | 2:1-82.module_el8.10.0+3876+e55593a8 |
containers-common AlmaLinux:8 | All versions | 2:1-82.module_el8.10.0+3901+4b80ecd7 |
containers-common AlmaLinux:8 | All versions | 2:1-82.module_el8.10.0+4089+ce72bbbe |
crit AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+3845+87b84552 |
crit AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+3858+6ad51f9f |
crit AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+3901+4b80ecd7 |
crit AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+4047+545787c4 |
criu AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+3876+e55593a8 |
criu AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+3909+6e1c1eb7 |
criu AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+3970+8445edf6 |
criu AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+4089+ce72bbbe |
criu-devel AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+3858+6ad51f9f |
criu-devel AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+4016+efd18bf8 |
criu-devel AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+4068+0e21408f |
criu-devel AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+4089+ce72bbbe |
criu-libs AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+3909+6e1c1eb7 |
criu-libs AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+3926+f12484f5 |
criu-libs AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+3970+8445edf6 |
criu-libs AlmaLinux:8 | All versions | 3.18-5.module_el8.10.0+4082+f7f0c95e |
crun AlmaLinux:8 | All versions | 1.14.3-2.module_el8.10.0+3858+6ad51f9f |
Products include Go Ssh.
How do I fix CVE-2025-47913?
Upgrade golang.org/x/crypto/ssh/agent to 0.43.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-47913 being exploited?
There is no known exploitation of CVE-2025-47913 in the wild and no public exploit code.
Other vulnerabilities in golang.org/x/crypto/ssh/agent
Sources
Also known as ALSA-2026:0436, ALSA-2026:0437, ALSA-2026:0470, ALSA-2026:0545, ALSA-2026:0753, AZL-70313 and 429 more.