CVE-2023-46737: Cosign is a sigstore signing tool for OCI containers

Q: How do I fix CVE-2023-46737?

cosign: upgrade to 2.2.1. Exact commands for each OS are on this page.

Q: Is CVE-2023-46737 being exploited?

CVE-2023-46737 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-46737 affect?

CVE-2023-46737 affects cosign. Severity is low (CVSS 3.1). Cosign is a sigstore signing tool for OCI containers. Cosign is susceptible to a denial of service by an attacker controlled registry. An attacker who controls a remote registry can return a high number of attestations and/or signatures to

Q: How urgent is CVE-2023-46737?

Priority 29/100. Public exploit reference

Routine

LOW 3.1UPGRADE

CVE-2023-46737 is a low-severity flaw (CVSS 3.1) affecting cosign. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cosign is a sigstore signing tool for OCI containers. Cosign is susceptible to a denial of service by an attacker controlled registry. An attacker who controls a remote registry can return a high number of attestations and/or signatures to Cosign and cause Cosign to enter a long loop resulting in an endless data attack. The root cause is that Cosign loops through all attestations fetched from the remote registry in pkg/cosign.FetchAttestations. T

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 49%)
CISA exploited list	No
Weakness	CWE-400, CWE-835
Published	2023-11-07
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: sigstore

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-11-07 18:15 UTCPublished CVE record published
2026-06-17 06:31 UTCUpdated Record last modified

sigstore cosign UPGRADE

Affected: < 2.2.1

Fixed in: 2.2.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy cosign || rpm -q cosign || cosign --version

2. UPGRADE to 2.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cosign

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cosign

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-46737?

cosign: upgrade to 2.2.1. Exact commands for each OS are on this page.

Is CVE-2023-46737 being exploited?

CVE-2023-46737 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-46737 affect?

CVE-2023-46737 affects cosign. Severity is low (CVSS 3.1). Cosign is a sigstore signing tool for OCI containers. Cosign is susceptible to a denial of service by an attacker controlled registry. An attacker who controls a remote registry can return a high number of attestations and/or signatures to

How urgent is CVE-2023-46737?

Priority 29/100. Public exploit reference

Related CVEs

CVE-2026-39395 MEDIUM 4.3 UPGRADE Cosign provides code signing and transparency for containers and binaries
CVE-2024-29903 MEDIUM 4.2 UPGRADE Cosign provides code signing and transparency for containers and binaries
CVE-2024-29902 MEDIUM 4.2 UPGRADE Cosign provides code signing and transparency for containers and binaries
CVE-2022-36056 MEDIUM 5.5 UPGRADE Cosign is a project under the sigstore organization which aims to make signatures invisible infrastructure
CVE-2022-23649 LOW 3.3 UPGRADE Cosign provides container signing, verification, and storage in an OCI registry for the sigstore project

References

← Back to latest CVEs