Security readout for executives and security teams
Plain-English summary
CVE-2026-24819 is a memory-consumption flaw in foxinmy weixin4j. Affected applications using this library could be forced into out-of-memory conditions under certain input or processing conditions, causing reliability impact. Public sources rate it medium severity, and the provided data does not show known active exploitation.
Executive priority
Treat as a reliability risk for services using weixin4j. Prioritize inventory and patch planning, especially for internet-facing or business-critical Java services. Urgency is moderate because public sources do not show active exploitation or a critical impact rating.
Technical view
The issue is CWE-1325, Improperly Controlled Sequential Memory Allocation, in weixin4j utility modules involving CharArrayBuffer.java and ClassUtil.java. The CVSS 4.0 score is 6.3, with network attack vector, low complexity, no privileges, no user interaction, and attack requirements present. Public data identifies weixin4j as affected but does not provide precise version ranges beyond the record.
Likely exposure
Exposure is most likely in Java applications that include foxinmy weixin4j, especially components parsing or handling data through the affected utility classes. The source bundle does not identify specific downstream products, deployment patterns, or exact affected version ranges.
Exploitation context
The CVE record indicates potential resource exhaustion rather than code execution. KEV status is false, and no provided source claims active exploitation. CVSS notes attack requirements are present, so exploitation may require a particular application path or input condition.
Researcher notes
Evidence is limited. The CVE identifies affected files and a patch pull request, but not exact vulnerable versions, fixed release numbers, or proof-of-concept details. Avoid assuming all WeChat integrations are affected; validate direct weixin4j dependency and patch status.
Mitigation direction
- Check whether your applications depend on foxinmy weixin4j.
- Review GitHub pull request #229 and vendor project guidance.
- Apply the vendor patch or upgrade when a fixed release is available.
- Monitor application memory limits and restart behavior for exposed services.
Validation and detection
- Inventory Java dependencies for foxinmy weixin4j usage.
- Confirm whether affected utility classes are present in deployed artifacts.
- Check project commits or releases for inclusion of PR #229.
- Review logs and monitoring for unexplained out-of-memory failures.
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-1325: 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 lookupCVE-2026-24819 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
- Medium
- CVSS
- 6.3 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/AU:Y/R:A/V:D/RE:M/U:Amber
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.
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:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/AU:Y/R:A/V:D/RE:M/U:Amber——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
6.3MediumVector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/AU:Y/R:A/V:D/RE:M/U:Amber
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/foxinmy/weixin4j/pull/229CVE reference · patch
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 Sequential Memory Allocation
Improperly Controlled Sequential Memory Allocation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.