CVE-2026-77121: A user account with permission to deploy artifacts to a hosted Maven repository could upload a POM file contai

Routine

MEDIUM 6.5UPGRADE

CVE-2026-77121 is a medium-severity flaw (CVSS 6.5) affecting nexus repository manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A user account with permission to deploy artifacts to a hosted Maven repository could upload a POM file containing an oversized metadata field. This causes future attempts to list or browse that repository's components to permanently fail until an administrator repairs the underlying data. Only the targeted repository is affected; other repositories and overall server health remain unaffected.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-09-02
Last modified	2026-10-07

Publisher (CNA): Sonatype · Vendor: sonatype

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-02 18:21 UTCPublished CVE record published
2026-10-07 13:24 UTCUpdated Record last modified

sonatype nexus repository manager UPGRADE

Affected: >= 3.26.0 and < 3.95.0

Fixed in: 3.95.0

Safe to downgrade to: a release before 3.26.0

1. Check installed version

apt-cache policy nexus-repository-manager || rpm -q nexus-repository-manager || nexus-repository-manager --version

2. UPGRADE to 3.95.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nexus-repository-manager

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nexus-repository-manager

Note

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

3. If no update is available yet, DOWNGRADE to a release before 3.26.0 (Debian / Ubuntu)

apt-cache madison nexus-repository-manager sudo apt install nexus-repository-manager=<VERSION_BEFORE_3.26.0> sudo apt-mark hold nexus-repository-manager

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nexus-repository-manager sudo dnf downgrade nexus-repository-manager-<VERSION_BEFORE_3.26.0> sudo dnf versionlock add nexus-repository-manager

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-77121?

nexus repository manager: upgrade to 3.95.0. Exact commands for each OS are on this page.

Is CVE-2026-77121 being exploited?

CVE-2026-77121 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-2026-77121 affect?

CVE-2026-77121 affects nexus repository manager. Severity is medium (CVSS 6.5). A user account with permission to deploy artifacts to a hosted Maven repository could upload a POM file containing an oversized metadata field. This causes future attempts to list or browse that repository's components to permanently fail u

How urgent is CVE-2026-77121?

Priority 27/100. No elevated risk signals yet.

Software pages

Sonatype Nexus vulnerabilities

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References

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