Allocation of Resources Without Limits or Throttling Affecting github.com/expr-lang/expr/builtin package, versions <1.17.7
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published17 Dec 2025
- disclosed16 Dec 2025
- creditVille Vesilehto
Introduced: 16 Dec 2025
CVE-2025-68156 (opens in a new tab)How to fix?
Upgrade github.com/expr-lang/expr/builtin to version 1.17.7 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the flatten, min, max, mean, and median functions when processing deeply nested or cyclic data structures. An attacker can cause the application to crash by supplying maliciously crafted input that triggers unbounded recursion and stack exhaustion.
Workaround
This vulnerability can be mitigated by ensuring evaluation environments do not contain cyclic references, validating or sanitizing externally supplied data structures, and wrapping expression evaluation with panic recovery to prevent a full process crash.