Upstream information
Description
Expr is an expression language and expression evaluation for Go. Prior to version 1.17.7, several builtin functions in Expr, including `flatten`, `min`, `max`, `mean`, and `median`, perform recursive traversal over user-provided data structures without enforcing a maximum recursion depth. If the evaluation environment contains deeply nested or cyclic data structures, these functions may recurse indefinitely until exceed the Go runtime stack limit. This results in a stack overflow panic, causing the host application to crash. While exploitability depends on whether an attacker can influence or inject cyclic or pathologically deep data into theevaluation environment, this behavior represents a denial-of-service (DoS) risk and affects overall library robustness. Instead of returning a recoverable evaluation error, the process may terminate unexpectedly. In affected versions, evaluation of expressions that invoke certain builtin functions on untrusted or insufficiently validated data structures can lead to a process-level crash due to stack exhaustion. This issue is most relevant in scenarios where Expr is used to evaluate expressions against externally supplied or dynamically constructed environments; cyclic references (directly or indirectly) can be introduced into arrays, maps, or structs; and there are no application-level safeguards preventing deeply nested input data. In typical use cases with controlled, acyclic data, the issue may not manifest. However, when present, the resulting panic can be used to reliably crash the application, constituting a denial of service. The issue has been fixed in the v1.17.7 versions of Expr. The patch introduces a maximum recursion depth limit for affected builtin functions. When this limit is exceeded, evaluation aborts gracefully and returns a descriptive error instead of panicking. Additionally, the maximum depth can be customized by users via `builtin.MaxDepth`, allowing applications with legitimate deep structures to raise the limit in a controlled manner. Users are strongly encouraged to upgrade to the patched release, which includes both the recursion guard and comprehensive test coverage to prevent regressions. For users who cannot immediately upgrade, some mitigations are recommended. Ensure that evaluation environments cannot contain cyclic references, validate or sanitize externally supplied data structures before passing them to Expr, and/or wrap expression evaluation with panic recovery to prevent a full process crash (as a last-resort defensive measure). These workarounds reduce risk but do not fully eliminate the issue without the patch.
SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having important severity.
| CVSS detail | CNA (GitHub) | SUSE |
|---|---|---|
| Base Score | 7.5 | 7.5 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Attack Vector | Network | Network |
| Attack Complexity | Low | Low |
| Privileges Required | None | None |
| User Interaction | None | None |
| Scope | Unchanged | Unchanged |
| Confidentiality Impact | None | None |
| Integrity Impact | None | None |
| Availability Impact | High | High |
| CVSSv3 Version | 3.1 | 3.1 |
| CVSS detail | SUSE |
|---|---|
| Base Score | 8.7 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| Attack Vector | Network |
| Attack Complexity | Low |
| Attack Requirements | None |
| Privileges Required | None |
| User Interaction | None |
| Vulnerable System Confidentiality Impact | None |
| Vulnerable System Integrity Impact | None |
| Vulnerable System Availability Impact | High |
| Subsequent System Confidentiality Impact | None |
| Subsequent System Integrity Impact | None |
| Subsequent System Availability Impact | None |
| CVSSv4 Version | 4.0 |
List of released packages
| Product(s) | Fixed package version(s) | References |
|---|---|---|
| openSUSE Tumbleweed |
| Patchnames: openSUSE-Tumbleweed-2025-15825 openSUSE-Tumbleweed-2025-15826 |
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SUSE Linux Enterprise Desktop 15 SP7 | alloy | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | alloy | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | alloy | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | grafana | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | grafana | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | grafana | Affected |
| SUSE Linux Enterprise Server 15 SP7 | alloy | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | alloy | Affected |
| SUSE Manager Client Tools 12 | grafana | Affected |
| SUSE Manager Client Tools 15 | grafana | Affected |
| SUSE Manager Client Tools for SLE 12 | grafana | Affected |
| SUSE Manager Client Tools for SLE 15 | grafana | Affected |
| SUSE Multi-Linux Manager Client Tools for SLE 12 | grafana | Affected |
| SUSE Multi-Linux Manager Client Tools for SLE 15 | grafana | Affected |
| openSUSE Leap 15.6 | grafana | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Linux Enterprise Module for Package Hub 15 SP4 | grafana | Affected |
| openSUSE Leap 15.3 | grafana | Affected |
| openSUSE Leap 15.4 | grafana | Affected |
| openSUSE Leap 15.5 | grafana | Affected |
| Products at an unknown state of their lifecycle. | ||
| SUSE Multi Linux Manager Tools Beta SLE-12 | grafana | Affected |
| SUSE Multi Linux Manager Tools Beta SLE-15 | grafana | Affected |
| SUSE Multi Linux Manager Tools SLE-12 | grafana | Affected |
| SUSE Multi Linux Manager Tools SLE-15 | grafana | Affected |
| Container Status | ||
| ses/7.1/ceph/grafana ses/7/ceph/grafana | grafana | Affected |
SUSE Timeline for this CVE
CVE page created: Tue Dec 16 22:07:21 2025CVE page last modified: Fri Dec 19 18:40:01 2025