---
id: CVE-2021-29499
aliases:
  - GHSA-4gh8-x3vv-phhg
  - GO-2022-0912
title: Predictable SIF UUID Identifiers in github.com/sylabs/sif
summary: Predictable SIF UUID Identifiers in github.com/sylabs/sif
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'
vendor: sylabs
product: github.com/sylabs/sif
ecosystem: go
affected:
  - github.com/sylabs/sif < 1.2.3
patched:
  - github.com/sylabs/sif 1.2.3
published: '2021-05-18'
updated: '2026-07-08'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-4gh8-x3vv-phhg'
references:
  - url: 'https://github.com/sylabs/sif/security/advisories/GHSA-4gh8-x3vv-phhg'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2021-29499'
  - url: 'https://github.com/satori/go.uuid/issues/73'
  - url: >-
      https://github.com/sylabs/sif/commit/193962882122abf85ff5f5bcc86404933e71c07d
  - url: 'https://github.com/sylabs/sif'
tags:
  - osv
  - go
epss: 0.00958
epssPercentile: 0.59806
ingestedAt: '2026-07-09T18:56:35.901Z'
---

## Overview

### Impact

The `siftool new` command and [func siftool.New()](https://pkg.go.dev/github.com/sylabs/sif/pkg/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.

### Patches

A patch is available in version >= v1.2.3 of the module. Users are encouraged to upgrade.

The patch is commit https://github.com/sylabs/sif/commit/193962882122abf85ff5f5bcc86404933e71c07d

### Workarounds
Users passing [CreateInfo struct](https://pkg.go.dev/github.com/sylabs/sif/pkg/sif#CreateInfo) should ensure the `ID` field is generated using a version of `github.com/satori/go.uuid` that is not vulnerable to this issue. Unfortunately, the latest tagged release is vulnerable to this issue. One way to obtain a non-vulnerable version is:

```
go get github.com/satori/go.uuid@75cca531ea763666bc46e531da3b4c3b95f64557
```

### References
* https://github.com/satori/go.uuid/issues/73

### For more information
If you have any questions or comments about this advisory:
* Open an issue in [github.com/sylabs/sif](https://github.com/sylabs/sif/issues/new)
* Email us at [security@sylabs.io](mailto:security@sylabs.io)


## Affected packages

- `github.com/sylabs/sif < 1.2.3`

## Remediation

Upgrade to a patched release:

- `github.com/sylabs/sif 1.2.3`