CVE-2026-55548: Yamcs is a mission control framework

Routine

MEDIUM 4.3UPGRADE

CVE-2026-55548 is a medium-severity flaw (CVSS 4.3) affecting yamcs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, the PacketsApi.exportPackets endpoint in yamcs-core/src/main/java/org/yamcs/http/api/PacketsApi.java failed to enforce object-level ReadPacket privileges when a request omitted specific packet names: with an empty name list the ctx.checkObjectPrivileges(ObjectPrivilegeType.ReadPacket, nameSet) call passed over an empty set, no WHERE pname IN filter was applied to the resulting SELE

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-284, CWE-862
Published	2026-07-16
Last modified	2026-07-20

Publisher (CNA): GitHub, Inc. · Vendor: spaceapplications

Last updated 2026-07-20 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-16 17:16 UTCPublished CVE record published
2026-07-20 01:29 UTCUpdated Record last modified

spaceapplications yamcs UPGRADE

Affected: < 5.12.8 · >= 5.13.0 and < 5.13.2

Fixed in: 5.12.8, 5.13.2

Safe to downgrade to: a release before 5.13.0

1. Check installed version

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

2. UPGRADE to 5.12.8 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade yamcs

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 5.13.0 (Debian / Ubuntu)

apt-cache madison yamcs sudo apt install yamcs=<VERSION_BEFORE_5.13.0> sudo apt-mark hold yamcs

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

dnf --showduplicates list yamcs sudo dnf downgrade yamcs-<VERSION_BEFORE_5.13.0> sudo dnf versionlock add yamcs

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-2026-55548?

yamcs: upgrade to 5.12.8, 5.13.2. Exact commands for each OS are on this page.

Is CVE-2026-55548 being exploited?

CVE-2026-55548 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-2026-55548 affect?

CVE-2026-55548 affects yamcs. Severity is medium (CVSS 4.3). Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, the PacketsApi.exportPackets endpoint in yamcs-core/src/main/java/org/yamcs/http/api/PacketsApi.java failed to enforce object-level ReadPacket privileges when a request omitt

How urgent is CVE-2026-55548?

Priority 27/100. Public exploit reference

Software pages

Java vulnerabilities

Related CVEs

CVE-2026-46562 CRITICAL 9.8 UPGRADE Yamcs is a mission control framework
CVE-2026-46621 CRITICAL 9.1 UPGRADE Yamcs is a mission control framework
CVE-2026-44595 MEDIUM 4.3 UPGRADE Yamcs is a mission control framework
CVE-2026-44596 MEDIUM 6.5 UPGRADE Yamcs is a mission control framework
CVE-2026-44632 CRITICAL 9.1 UPGRADE Yamcs is a mission control framework

References

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