---
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: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-789
  - CWE-770
vendor: google
product: common_expression_language
affected:
  - common_expression_language < 0.29.0
patched:
  - common_expression_language 0.29.0
published: '2026-09-09'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T20:38:26.053'
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
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-83530.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-83530'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2542790'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-83530'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83530'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00161
epssPercentile: 0.05202
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-09T15:15:05.009764Z'
scores:
  nvd: 4.3
  cna: 6.9
  vendor: 5.3
ingestedAt: '2026-09-14T00:02:15.467Z'
---

## 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.

## Affected

- `common_expression_language < 0.29.0`

## Remediation

Upgrade past the affected range:

- `common_expression_language 0.29.0`

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-29 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-83530.json)