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CVE-2020-26238

Critical vulnerability found in cron-utils

HIGH
8.1
CVSS Score
Published: November 24, 2020 at 11:50 PM UTC
Updated: June 17, 2026 at 03:07 AM UTC
2 products affected across 2 vendorsCron UtilsUtils Project Cron Utils

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Severity
HIGH8.1
Exploit prediction
EPSS 4%

Description

Cron-utils is a Java library to parse, validate, migrate crons as well as get human readable descriptions for them. In cron-utils before version 9.1.3, a template Injection vulnerability is present. This enables attackers to inject arbitrary Java EL expressions, leading to unauthenticated Remote Code Execution (RCE) vulnerability. Only projects using the @Cron annotation to validate untrusted Cron expressions are affected. This issue was patched in version 9.1.3.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cron Utils· Cron Utils Project
95%
v < 9.1.3
Affected range stops below 9.1.3, so it looks safe — our inference, not a vendor statement
Utils Project Cron Utils· Jmrozanec
60%
v < 9.1.3
Affected range stops below 9.1.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (13)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/jmrozanec/cron-utils/commit/4cf373f7352f5d95f0bf6512af8af326b31c835e
x_refsource_MISCExploitIssue TrackingThird Party Advisory
Source: [email protected]
https://github.com/jmrozanec/cron-utils/issues/461
x_refsource_CONFIRMExploitThird Party Advisory
Source: [email protected]
https://github.com/jmrozanec/cron-utils/security/advisories/GHSA-pfj3-56hm-jwq5
Mailing Listx_refsource_MLIST
Source: [email protected]
https://lists.apache.org/thread.html/r390bb7630b7ea8f02bf7adbbe69c0ae8b562c527d663c543d965f959%40%3Cgitbox.hive.apache.org%3E
Mailing Listx_refsource_MLIST
Source: [email protected]
https://lists.apache.org/thread.html/r432a69a1a85cbcb1f1bad2aa0fbfce0367bf894bf917f6ed7118e7f0%40%3Cissues.hive.apache.org%3E
Mailing Listx_refsource_MLIST
Source: [email protected]
https://lists.apache.org/thread.html/r50e1b5544c37e408ed7e9a958b28237b1cb9660ba2b3dba46f343e23%40%3Cissues.hive.apache.org%3E
Mailing Listx_refsource_MLIST
Source: [email protected]
https://lists.apache.org/thread.html/r5f601d15292e3302ad0ae0e89527029546945b1cd5837af7e838d354%40%3Cdev.hive.apache.org%3E
Mailing Listx_refsource_MLIST
Source: [email protected]
https://lists.apache.org/thread.html/r71083c759dc627f198571b3d48b6745fe798b1d53c34f7ef8de9e7dd%40%3Cissues.hive.apache.org%3E

CVSS

8.1HIGH[email protected]
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-74

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