CVE-2021-29499: Predictable SIF UUID Identifiers

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-05-07 · updated 2026-06-17
Weakness: CWE-330

Description

SIF is an open source implementation of the Singularity Container Image Format. The `siftool new` command and func siftool.New() produce predictable UUID identifiers due to insecure randomness in the version of the `github.com/satori/go.uuid` module used as a dependency. A patch is available in version >= v1.2.3 of the module. Users are encouraged to upgrade. As a workaround, users passing CreateInfo struct should ensure the `ID` field is generated using a version of `github.com/satori/go.uuid` that is not vulnerable to this issue.

Affected products

sylabs Singularity Image Format: before 1.2.3 — fixed in 1.2.3

How to fix

Upgrade to a fixed version: sylabs Singularity Image Format 1.2.3. Check the vendor advisory for mitigations.

References

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