Security readout for executives and security teams
Plain-English summary
CVE-2023-39329 is a denial-of-service flaw in OpenJPEG. A crafted image can make affected software consume excessive resources while decoding, potentially disrupting services that process user-supplied images. The sources do not show data theft or code execution.
Executive priority
Treat as a moderate availability risk. Prioritize internet-facing or automated image-processing services first, then desktop and bundled application exposure. This is not described as remote code execution, but downtime remains plausible where untrusted images are processed at scale.
Technical view
The flaw is resource exhaustion in OpenJPEG's opj_t1_decode_cblks function in tcd.c. CVSS 3.1 is 6.5, with network attack vector, low complexity, no privileges required, user interaction required, and high availability impact only.
Likely exposure
Exposure is most likely where OpenJPEG 2.5.0 or Red Hat openjpeg2 packages process untrusted image files. Listed Red Hat exposure includes RHEL 8 and 9 openjpeg2 packages, related Flatpaks, and Red Hat AI Inference Server 3.2 image digest. RHEL 6 and 7 statuses are listed as unknown.
Exploitation context
The documented trigger is a crafted image file. The CVSS vector requires user interaction, so practical risk depends on whether an affected application opens or processes attacker-controlled images. The provided sources do not indicate CISA KEV listing or active exploitation.
Researcher notes
Evidence is strongest for the OpenJPEG function-level denial-of-service description and Red Hat product mapping. The bundle does not provide patch commit details, exploit maturity, or complete status for every downstream package, so validation should be asset-specific.
Mitigation direction
- Apply Red Hat RHSA-2026:4128 where it covers your affected assets.
- Update OpenJPEG/openjpeg2 through supported vendor package channels.
- Limit untrusted image uploads to services that need them.
- Use resource limits around image-processing workloads where feasible.
- Check vendor guidance for products with unknown status.
Validation and detection
- Inventory OpenJPEG/openjpeg2 versions across servers, containers, desktops, and Flatpaks.
- Map findings to the affected products and package names in the source bundle.
- Confirm Red Hat errata or vendor updates are installed.
- Identify public upload or conversion paths that invoke OpenJPEG.
- Review monitoring for image-processing crashes or resource exhaustion.
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-400: 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-2023-39329 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
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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.
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:R/S:U/C:N/I:N/A:H2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2026:4128CVE reference · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2023-39329CVE reference · vdb-entry, x_refsource_REDHAT
- RHBZ#2295816CVE reference · issue-tracking, 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.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.