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

Q: How do I fix CVE-2023-30549?

apptainer: upgrade to 1.1.8; singularity: mitigate or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2023-30549 being exploited?

CVE-2023-30549 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-2023-30549 affect?

CVE-2023-30549 affects apptainer, singularity, enterprise linux. Severity is high (CVSS 7.1). 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

Q: How urgent is CVE-2023-30549?

Priority 37/100. High severity; On your watchlist

Routine

HIGH 7.1WATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2023-30549 is a high-severity flaw (CVSS 7.1) affecting apptainer, singularity, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 ke

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-416
Published	2023-04-25
Last modified	2026-10-23

Publisher (CNA): GitHub, Inc. · Vendor: lfprojects · redhat · sylabs

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-04-25 21:15 UTCPublished CVE record published
2026-10-23 23:10 UTCUpdated Record last modified

lfprojects apptainer UPGRADE

Affected: < 1.1.8

Fixed in: 1.1.8

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.1.8 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade apptainer

Note

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

sylabs singularity MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

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

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

redhat enterprise linux MITIGATE

Affected: 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Go · github.com/apptainer/apptainer · FIXED · 1.1.8 · vulnerable: < 1.1.8 · source

go get github.com/apptainer/apptainer@v1.1.8 go list -m github.com/apptainer/apptainer

Fedora 46 · sugar-toolkit-gtk3 · FIXED · 0.122-2.fc46 · FEDORA-2026-d11eb2faf0 · source

sudo dnf upgrade --advisory=FEDORA-2026-d11eb2faf0

Fedora ELN · ntpd-rs · FIXED · 1.7.2-3.eln159 · FEDORA-2026-57e4a99310 · source

sudo dnf upgrade --advisory=FEDORA-2026-57e4a99310

Alpine 3.20 · apptainer · FIXED · apptainer-1.1.8-r0

apk add --upgrade apptainer apk info -v apptainer

Alpine 3.21 · apptainer · FIXED · apptainer-1.1.8-r0

apk add --upgrade apptainer apk info -v apptainer

Alpine 3.22 · apptainer · FIXED · apptainer-1.1.8-r0

apk add --upgrade apptainer apk info -v apptainer

Alpine 3.23 · apptainer · FIXED · apptainer-1.1.8-r0

apk add --upgrade apptainer apk info -v apptainer

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-2023-30549?

apptainer: upgrade to 1.1.8; singularity: mitigate or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-30549 being exploited?

CVE-2023-30549 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-2023-30549 affect?

CVE-2023-30549 affects apptainer, singularity, enterprise linux. Severity is high (CVSS 7.1). 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

How urgent is CVE-2023-30549?

Priority 37/100. High severity; On your watchlist

Software pages

Ubuntu vulnerabilities · Debian vulnerabilities · Red Hat Enterprise Linux vulnerabilities

References

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