CVE-2026-54133: jmespath.php allows users to use JMESPath, software for declaratively specifying how to extract elements from

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CRITICAL 9.8REMOTEUPGRADE

CVE-2026-54133 is a critical-severity flaw (CVSS 9.8) affecting jmespath. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

jmespath.php allows users to use JMESPath, software for declaratively specifying how to extract elements from a JSON document, in PHP applications with PHP data structures. Versions prior to 2.9.1 can generate and execute attacker-controlled PHP code when `JmesPath\CompilerRuntime` is used with an attacker-controlled JMESPath expression. The compiler emits parsed JMESPath function names into generated PHP source without sufficient escaping. A cra

Why this priority

Critical severity
CISA SSVC: public proof of concept
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-20, CWE-94, CWE-116
Published	2026-06-12
Last modified	2026-10-25

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

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-12 15:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

jmespath jmespath UPGRADE

Affected: < 2.9.1

Fixed in: 2.9.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.9.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jmespath

Note

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

Exact fixes by distribution

Composer (PHP) · mtdowling/jmespath.php · FIXED · 2.9.1 · vulnerable: < 2.9.1 · source

composer require "mtdowling/jmespath.php:>=2.9.1"

Fedora 46 · log4cplus · FIXED · 2.2.0.1-2.fc46 · FEDORA-2026-fc241370c9 · source

sudo dnf upgrade --advisory=FEDORA-2026-fc241370c9

Fedora ELN · velocitty · FIXED · 1.0.3-2.eln159 · FEDORA-2026-edae8cd295 · source

sudo dnf upgrade --advisory=FEDORA-2026-edae8cd295

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-2026-54133?

jmespath: upgrade to 2.9.1. Exact commands for each OS are on this page.

Is CVE-2026-54133 being exploited?

CVE-2026-54133 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-2026-54133 affect?

CVE-2026-54133 affects jmespath. Severity is critical (CVSS 9.8). jmespath.php allows users to use JMESPath, software for declaratively specifying how to extract elements from a JSON document, in PHP applications with PHP data structures. Versions prior to 2.9.1 can generate and execute attacker-controlle

How urgent is CVE-2026-54133?

Priority 55/100. Critical severity; CISA SSVC: public proof of concept; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

References

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