CVE-2023-33546: Janino 3.1.9 and earlier are subject to denial of service (DOS) attacks when using the expression evaluator.gu

Q: How do I fix CVE-2023-33546?

janino: upgrade to newer than 3.1.9. Exact commands for each OS are on this page.

Q: Is CVE-2023-33546 being exploited?

CVE-2023-33546 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-2023-33546 affect?

CVE-2023-33546 affects janino. Severity is medium (CVSS 5.5). Janino 3.1.9 and earlier are subject to denial of service (DOS) attacks when using the expression evaluator.guess parameter name method. If the parser runs on user-supplied input, an attacker could supply content that causes the parser to c

Q: How urgent is CVE-2023-33546?

Priority 31/100. Public exploit reference

Routine

MEDIUM 5.5UPGRADE

CVE-2023-33546 is a medium-severity flaw (CVSS 5.5) affecting janino. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Janino 3.1.9 and earlier are subject to denial of service (DOS) attacks when using the expression evaluator.guess parameter name method. If the parser runs on user-supplied input, an attacker could supply content that causes the parser to crash due to a stack overflow. NOTE: this is disputed by multiple parties because Janino is not intended for use with untrusted input.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-787
Published	2023-06-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: janino project

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

Am I affected?

Timeline

2023-06-01 13:15 UTCPublished CVE record published
2026-06-17 06:01 UTCUpdated Record last modified

janino project janino UPGRADE

Affected: <= 3.1.9

Fixed in: newer than 3.1.9

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 3.1.9 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade janino

Note

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

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-2023-33546?

janino: upgrade to newer than 3.1.9. Exact commands for each OS are on this page.

Is CVE-2023-33546 being exploited?

CVE-2023-33546 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-2023-33546 affect?

CVE-2023-33546 affects janino. Severity is medium (CVSS 5.5). Janino 3.1.9 and earlier are subject to denial of service (DOS) attacks when using the expression evaluator.guess parameter name method. If the parser runs on user-supplied input, an attacker could supply content that causes the parser to c

How urgent is CVE-2023-33546?

Priority 31/100. Public exploit reference

References

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