Security readout for executives and security teams
Plain-English summary
Seroval versions before 1.5.3 can mishandle specially structured, attacker-controlled JSON during deserialization. In affected applications, this may trigger unintended server-side behavior and, in certain framework integrations, potentially remote code execution. Impact depends on whether untrusted data reaches seroval.fromJSON(), plugins are enabled, and callable wrappers are registered.
Executive priority
Treat as an immediate remediation priority for internet-facing or multi-tenant services that deserialize untrusted data with affected Seroval versions. Rapidly establish exposure, then upgrade. Systems without an untrusted path to seroval.fromJSON() are lower urgency but should still remove the vulnerable dependency promptly.
Technical view
Promise control nodes can reference general deserialization-table values without confirming they are genuine internal Promise resolver records. This type confusion can invoke attacker-controlled methods as a deserialization side effect. The highest stated impact requires plugins and downstream callable-wrapper integration. Version 1.5.3 fixes the issue.
Likely exposure
Exposure exists where seroval below 1.5.3 is directly or transitively deployed and attacker-controlled JSON reaches seroval.fromJSON(). Server-side applications using plugins and frameworks that register callable wrappers face the greatest stated risk. The bundle does not identify specific downstream frameworks or confirm that every Seroval deployment is exploitable.
Exploitation context
The CVSS 3.1 score is 9.8, reflecting a network-accessible, low-complexity, unauthenticated scenario without user interaction. However, the supplied record is not in KEV, and no cited source establishes active exploitation. Practical impact remains configuration- and data-flow-dependent.
Researcher notes
Focus review on Promise control-node handling, reference-table type validation, plugin-enabled deserialization, and framework registrations that make referenced values callable. The sources describe possible remote code execution but do not name affected downstream frameworks, provide deployment prevalence, or demonstrate exploitation in the wild. Avoid treating the CVSS worst case as universal.
Mitigation direction
- Upgrade Seroval to version 1.5.3 or later.
- Update lockfiles and rebuild deployed artifacts to remove vulnerable transitive copies.
- Prevent untrusted JSON from reaching seroval.fromJSON() until upgrading.
- Review vendor guidance for any framework-specific remediation or compatibility requirements.
Validation and detection
- Inventory direct and transitive Seroval versions across applications and deployed bundles.
- Trace whether attacker-controlled data can reach seroval.fromJSON().
- Identify enabled Seroval plugins and downstream callable-wrapper registrations.
- Confirm production artifacts resolve Seroval to version 1.5.3 or later.
- Run existing deserialization and integration tests after upgrading.
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-502: 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 lookupCWE-843: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-59940 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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
1 official scoreWe 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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9GitHub_MVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-mv8w-475r-vwqwCVE reference, GitHub_M · x_refsource_CONFIRM
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.
Deserialization of Untrusted Data
Deserialization of Untrusted Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Access of Resource Using Incompatible Type
Access of Resource Using Incompatible Type represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.