synced 7 MIN AGO
01 Record

CVE-2026-77414

JSONata: Arbitrary Code Execution via crafted JSONata expressions

CriticalPUBLISHEDCNA: GitHub_M
CNA base score9.3 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
View raw JSON

02 Description

JSONata: Arbitrary Code Execution via crafted JSONata expressions

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.57% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 46.8% of scored records. A rank, not a probability.
NVD base score
9.3 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD analysis status
Deferred. NVD last modified this record on 2026-10-12.
Red Hat severity
Critical. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-08-21 20:51Z2 MO AGO
Last updated
2026-08-26 17:42Z2 MO AGO
Reserved
2026-08-20
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Critical (CVSS 9.3)
CNA CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weaknesses
  • CWE-94Improper Control of Generation of Code ('Code Injection')Base
  • CWE-917Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')Base
Data version
5.2
Document digest
a7aec9eed86d567651b7493e7eb6712b4e98385ad5d5a69fc645089f5e525ec7

05 Affected products

VendorProductVersionsPlatforms
jsonata-jsjsonata< 1.8.8, >= 2.0.0, < 2.2.1—

06 References