---
id: CVE-2026-83530
title: >-
  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 …
summary: >-
  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 …
severity: medium
cvss: 6.9
cvssVector: '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'
cwe:
  - CWE-789
vendor: Google
product: cel-go
affected:
  - cel-go < 0.29.0
published: '2026-09-09'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T16:17:11.983'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83530'
references:
  - url: 'https://github.com/cel-expr/cel-go/pull/1302'
    label: cve-coordination@google.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-09T15:15:05.009764Z'
cvssSource: cna
ingestedAt: '2026-09-14T00:02:15.467Z'
epss: 0.00208
epssPercentile: 0.11286
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.