CVE-2018-18628: An issue was discovered in Pippo 1.11.0

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-18628 is a critical-severity flaw (CVSS 9.8) affecting pippo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Pippo 1.11.0. The function SerializationSessionDataTranscoder.decode() calls ObjectInputStream.readObject() to deserialize a SessionData object without checking the object types. An attacker can create a malicious object, base64 encode it, and place it in the PIPPO_SESSION field of a cookie. Sending this cookie may lead to remote code execution.

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	5.5% (top 7%)
CISA exploited list	No
Weakness	CWE-502
Published	2018-10-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: pippo

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-10-23 20:29 UTCPublished CVE record published
2026-06-17 01:47 UTCUpdated Record last modified

pippo pippo DOWNGRADE

Affected: 1.11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.11.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.11.0 (Debian / Ubuntu)

apt-cache madison pippo sudo apt install pippo=<VERSION_BEFORE_1.11.0> sudo apt-mark hold pippo

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list pippo sudo dnf downgrade pippo-<VERSION_BEFORE_1.11.0> sudo dnf versionlock add pippo

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-2018-18628?

pippo: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-18628 being exploited?

CVE-2018-18628 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-2018-18628 affect?

CVE-2018-18628 affects pippo. Severity is critical (CVSS 9.8). An issue was discovered in Pippo 1.11.0. The function SerializationSessionDataTranscoder.decode() calls ObjectInputStream.readObject() to deserialize a SessionData object without checking the object types. An attacker can create a malicious

How urgent is CVE-2018-18628?

Priority 67/100. Critical severity; EPSS top 7%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

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References

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