EUVD-2026-75041
GHSA-c2gw-4533-c2w3
Severity by source
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
Network-reachable API, no auth or special conditions required; impact is partial availability loss only, with no confidentiality or integrity effect.
Primary rating from Vendor (Google).
CVSS VectorVendor: Google
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
Uncontrolled memory allocation in cel-go, Google's Go implementation of the Common Expression Language, allows remote unauthenticated attackers to trigger heap allocation proportional to the size of a submitted expression before the configured ParserExpressionSizeLimit is checked or enforced. Affected are all versions of cpe:2.3:a:google:cel-go:*:*:*:*:*:*:*:* whose Compile() and Parse() code paths call the pre-fix NewTextSource() without first bounding the input length. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No authentication is required (CVSS PR:N) and no special attack prerequisites apply (AT:N) for an attacker who can submit arbitrary-length strings to any service that passes user-controlled data to cel-go's Compile() or Parse() APIs. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector AV:N/AC:L/AT:N/PR:N/UI:N rates this as medium severity (6.9), with availability impact limited to VA:L - partial degradation rather than complete service crash from a single request. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the upstream fix from GitHub PR #1302 (https://github.com/cel-expr/cel-go/pull/1302), which adds early size-limit enforcement in both Compile() and Parse() via NewTextSourceWithLimit() and NewBufferAndLineOffsetsWithLimit(). … Detailed patch versions, workarounds, and compensating controls in full report. |
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