Security readout for executives and security teams
Plain-English summary
SimpleEval lets applications evaluate limited Python-like expressions. Before 1.0.5, objects supplied to the sandbox could expose dangerous modules or functions, weakening the sandbox boundary. Business risk is highest where SimpleEval evaluates user-controlled expressions or untrusted users influence callback inputs.
Executive priority
Treat as high priority where expression evaluation is exposed to users or external data. Patch promptly, then verify application code is not passing sensitive objects into evaluators.
Technical view
The issue affects danthedeckie/simpleeval versions before 1.0.5. Object attributes and callbacks could provide direct access to disallowed modules or dangerous functions inside the evaluator. The CVE maps to CWE-915 and CWE-94 and carries CVSS 4.0 score 8.7 with network, low-complexity, no-auth characteristics.
Likely exposure
Python applications using simpleeval below 1.0.5, especially API, automation, rules, templating, or workflow features that evaluate expressions from users, tenants, or external data.
Exploitation context
The provided sources do not show KEV listing or confirmed active exploitation. The described bug is sandbox escape risk when unsafe objects, modules, attributes, or callbacks are reachable through values passed into SimpleEval.
Researcher notes
Evidence supports a sandbox boundary weakness fixed in 1.0.5. The bundle does not include exploit details or active exploitation evidence. Focus validation on dependency reachability and evaluator inputs rather than assuming every installation is remotely exploitable.
Mitigation direction
- Upgrade simpleeval to version 1.0.5 or later.
- Rebuild and redeploy services that vendor or bundle simpleeval.
- Review downstream Debian or Red Hat advisories where packages are OS-managed.
- Reduce exposed names, objects, modules, and callbacks passed into evaluators.
- Add dependency controls to prevent reintroducing simpleeval versions below 1.0.5.
Validation and detection
- Inventory Python dependencies, lockfiles, SBOMs, and container images for simpleeval.
- Confirm every deployed simpleeval instance is version 1.0.5 or later.
- Identify code paths calling SimpleEval or simple_eval with external input.
- Review supplied names and callbacks for objects exposing sensitive attributes.
- Check vendor package status if using Debian or Red Hat builds.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-915: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-94: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-32640 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N——GitHub_MCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N3.93.6redhat-SADPVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- ADP timelineredhat-SADP
Made public.
- CVE publishedCVE Program
The CVE record was published.
- ADP timelineredhat-SADP
Reported to Red Hat.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-03-13T22:02:17.336Z: Reported to Red Hat.
- 2026-03-13T21:03:53.435Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/danthedeckie/simpleeval/security/advisories/GHSA-44vg-5wv2-h2hgCVE reference, GitHub_M · x_refsource_CONFIRM
- https://lists.debian.org/debian-lts-announce/2026/04/msg00023.htmlCVE reference, CVE
- https://access.redhat.com/security/cve/CVE-2026-32640CVE reference, redhat-SADP · vdb-entry, x_refsource_REDHAT
- RHBZ#2447529CVE reference, redhat-SADP · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32640.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:10184CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:37275CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improperly Controlled Modification of Dynamically-Determined Object Attributes
Improperly Controlled Modification of Dynamically-Determined Object Attributes represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Improper Control of Generation of Code ('Code Injection')
Improper Control of Generation of Code ('Code Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.