CVE-2026-83530

6.9 MEDIUM 0.2% exploit odds Fix listed Other

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 0.2% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-09-09 15:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-09-23 20:38 UTC Last updatedMost recent change to the record

Details

Published: 2026-09-09 15:17 UTC
Last modified: 2026-09-23 20:38 UTC
Exploit probability: 0.2% · EPSS, next 30 days
Weakness: CWE-789
Record status: Analyzed

Affected

Google Common Expression Language < 0.29.0

Attack profile CVSS 4.0 · 6.9

Attack vector: Network
Complexity: Low
Attack requirements: None
Privileges needed: None
User interaction: None
Confidentiality: None
Integrity: None
Availability: Low

Raw 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/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

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Fix and advisories

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

References

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

NVD record · CVE.org record