CVE-2026-83530 PUBLISHED

Uncontrolled Memory Allocation in cel-go

Assigner: Google
Reserved: 31.08.2026 Published: 09.09.2026 Updated: 09.09.2026

A user could provide an expression whose string length is longer than the ParserExpressionSizeLimit() configured on the CEL environment, and a memory allocation would occur proportional to the size of the input before the limit would be checked / enforced.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Google
Product	cel-go
Versions	Default: unaffected affected from 0 to 0.29.0 (excl.)

Credits

Ali Firas (thesmartshadow) finder

References

https://github.com/cel-expr/cel-go/pull/1302

Problem Types

CWE-789 Memory Allocation with Excessive Size Value CWE

Impacts

CAPEC-130 Excessive Allocation