CVE-2026-83530: A user could provide an expression whose string length is longer than the ParserExpressionSizeLimit() configur

Q: How do I fix CVE-2026-83530?

common expression language: upgrade to 0.29.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-83530 being exploited?

CVE-2026-83530 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-83530 affect?

CVE-2026-83530 affects common expression language. Severity is medium (CVSS 4.3). 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 che

Q: How urgent is CVE-2026-83530?

Priority 16/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2026-83530 is a medium-severity flaw (CVSS 4.3) affecting common expression language. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-789
Published	2026-09-09
Last modified	2026-09-23

Publisher (CNA): Google Inc. · Vendor: google

Last updated 2026-09-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-09 15:17 UTCPublished CVE record published
2026-09-23 20:38 UTCUpdated Record last modified

google common expression language UPGRADE

Affected: < 0.29.0

Fixed in: 0.29.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy common-expression-language || rpm -q common-expression-language || common-expression-language --version

2. UPGRADE to 0.29.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade common-expression-language

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade common-expression-language

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-83530?

common expression language: upgrade to 0.29.0. Exact commands for each OS are on this page.

Is CVE-2026-83530 being exploited?

CVE-2026-83530 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-83530 affect?

CVE-2026-83530 affects common expression language. Severity is medium (CVSS 4.3). 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 che

How urgent is CVE-2026-83530?

Priority 16/100. No elevated risk signals yet.

References

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