High 7.8Published Apr 25, 2023

CVE-2023-30549Apptainer is an open source container platform for Linux.

Updated under an hour ago (Oct 27, 2026, 3:23 AM ET)

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Every CVE for lfprojects apptainer

Exploited in the last 30 days

Apptainer is an open source container platform for Linux. There is an ext4 use-after-free flaw that is exploitable through versions of Apptainer < 1.1.0 and installations that include apptainer-suid < 1.1.8 on older operating systems where that CVE has not been patched. That includes Red Hat Enterprise Linux 7, Debian 10 buster (unless the linux-5.10 package is installed), Ubuntu 18.04 bionic and Ubuntu 20.04 focal. Use-after-free flaws in the kernel can be used to attack the kernel for denial of service and potentially for privilege escalation. Apptainer 1.1.8 includes a patch that by default disables mounting of extfs filesystem types in setuid-root mode, while continuing to allow mounting of extfs filesystems in non-setuid "rootless" mode using fuse2fs. Some workarounds are possible. Either do not install apptainer-suid (for versions 1.1.0 through 1.1.7) or set `allow setuid = no` in apptainer.conf. This requires having unprivileged user namespaces enabled and except for apptainer 1.1.x versions will disallow mounting of sif files, extfs files, and squashfs files in addition to other, less significant impacts. (Encrypted sif files are also not supported unprivileged in apptainer 1.1.x.). Alternatively, use the `limit containers` options in apptainer.conf/singularity.conf to limit sif files to trusted users, groups, and/or paths, and set `allow container extfs = no` to disallow mounting of extfs overlay files. The latter option by itself does not disallow mounting of extfs overlay partitions inside SIF files, so that's why the former options are also needed.

CVSS: 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Oct 23, 2026
First seen by InfoSec Signals: Oct 23, 2026

Affected products

Affected products

lfprojects apptainer lfprojects:apptainer	before 1.1.8	NVD
sylabs singularity sylabs:singularity	all versions	NVD
redhat enterprise_linux redhat:enterprise_linux	7.0	NVD

References

References

https://access.redhat.com/security/cve/cve-2022-1184	not-applicable
https://github.com/apptainer/apptainer/commit/5a4964f5ba9c8d89a0e353b97f51fd607670a9f7	patch
https://github.com/apptainer/apptainer/releases/tag/v1.1.8	release-notes
https://github.com/apptainer/apptainer/security/advisories/GHSA-j4rf-7357-f4cg	mitigation, vendor-advisory
https://github.com/torvalds/linux/commit/2220eaf90992c11d888fe771055d4de3303
https://github.com/torvalds/linux/commit/4f04351888a83e595571de672e0a4a8b74f
https://lwn.net/Articles/932136/
https://lwn.net/Articles/932137/
https://security-tracker.debian.org/tracker/CVE-2022-1184	not-applicable
https://security.gentoo.org/glsa/202311-13
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.