Symlink Following Affecting singularity package, versions <4.3.5-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published4 Dec 2025
- disclosed2 Dec 2025
Introduced: 2 Dec 2025
NewCVE-2025-64750 (opens in a new tab)How to fix?
Upgrade Alpine:3.23 singularity to version 4.3.5-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream singularity package and not the singularity package as distributed by Alpine.
See How to fix? for Alpine:3.23 relevant fixed versions and status.
SingularityCE and SingularityPRO are open source container platforms. Prior to SingularityCE 4.3.5 and SingularityPRO 4.1.11 and 4.3.5, if a user relies on LSM restrictions to prevent malicious operations then, under certain circumstances, an attacker can redirect the LSM label write operation so that it is ineffective. The attacker must cause the user to run a malicious container image that redirects the mount of /proc to the destination of a shared mount, either known to be configured on the target system, or that will be specified by the user when running the container. The attacker must also control the content of the shared mount, for example through another malicious container which also binds it, or as a user with relevant permissions on the host system it is bound from. This vulnerability is fixed in SingularityCE 4.3.5 and SingularityPRO 4.1.11 and 4.3.5.
References
- https://github.com/advisories/GHSA-fh74-hm69-rqjw
- https://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm
- https://github.com/sylabs/singularity/commit/27882963879a7af1699fd6511c3f5f1371d80f33
- https://github.com/sylabs/singularity/commit/5af3e790c40593591dfc26d0692e4d4b21c29ba0
- https://github.com/sylabs/singularity/pull/3850
- https://github.com/sylabs/singularity/security/advisories/GHSA-wwrx-w7c9-rf87