Analyst readout for executives and security teams
Plain-English summary
CVE-2026-9500 is a heap-based buffer overflow in GNU LibreDWG's dwgread utility when handling a DWG compressed section. The published data rates it medium because exploitation requires local access and low privileges. A public exploit artifact exists, but the bundle does not show active exploitation or a vendor fix.
Executive priority
Prioritize as a moderate operational risk. It is not remotely exploitable per the provided CVSS vector, but public exploit availability makes untrusted DWG handling worth controlling until vendor guidance or a fixed release is available.
Technical view
The flaw affects read_2004_compressed_section in src/decode.c within GNU LibreDWG dwgread, versions 0.1 through 0.14. It is classified as CWE-119 and CWE-122 with CVSS 3.1 score 5.3, AV:L/AC:L/PR:L/UI:N. Sources state public exploit availability and no vendor response yet.
Likely exposure
Exposure is most likely on developer, CAD, analysis, or conversion systems using LibreDWG/dwgread to process DWG files. The source says attack requires local access, so risk rises where local users or jobs handle DWG files from untrusted parties.
Exploitation context
The bundle says an exploit has been made public and could be used. It does not cite KEV listing or active in-the-wild exploitation. Treat untrusted DWG processing as the practical risk, especially in shared workstations or automated file-processing environments.
Researcher notes
Evidence points to a heap out-of-bounds write in read_2004_compressed_section. The third-party submission references LibreDWG up to 0.14 and main branch commit 6d6a339. Vendor confirmation and a fix are not present in the supplied sources, so remediation guidance remains compensating controls plus monitoring.
Mitigation direction
- Inventory LibreDWG and dwgread installations through version 0.14.
- Avoid opening or converting untrusted DWG files with affected dwgread versions.
- Run DWG processing in isolated, low-privilege environments.
- Restrict local access to systems that process DWG files.
- Monitor LibreDWG issue 1241 and vendor guidance for fixes.
- Remove dwgread where it is not operationally required.
Validation and detection
- Confirm installed LibreDWG versions and package sources.
- Identify workflows that invoke dwgread or LibreDWG libraries.
- Check whether DWG inputs come from external or untrusted sources.
- Verify isolation controls around CAD conversion or analysis jobs.
- Track vendor issue status before declaring remediation complete.
Public sources used
Based on public source material and reviewed before publication.
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-119: 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-122: 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-2026-9500 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
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
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
4 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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R 1.8 3.4 VulDB CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R 1.8 3.4 VulDB CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P — — VulDB AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR 3.1 6.4 VulDB Vulnerability scoring details
Base CVSS 4.0 score
4.8 MediumVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
Base CVSS 3.1 score
5.3 MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
Base CVSS 3.0 score
5.3 MediumVector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
Base CVSS 2.0 score
4.3 MediumVector: AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- Source timeline VulDB
Advisory disclosed
- Source timeline VulDB
VulDB entry created
- CVE reserved CVE Program
The CVE ID was reserved by the assigning CNA.
- Source timeline VulDB
VulDB entry last update
- CVE published CVE Program
The CVE record was published.
- CVE updated CVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 source CVE List V5
- VDB-365482 | GNU LibreDWG Dwgread Utility decode.c read_2004_compressed_section heap-based overflow CVE reference, VulDB · vdb-entry, technical-description
- VDB-365482 | CTI Indicators (IOB, IOC, IOA) CVE reference, VulDB · signature, permissions-required
- Submit #814248 | LibreDWG Project LibreDWG <= 0.14, main branch up to commit 6d6a339 (released 2026-04-10) Heap-based Buffer Overflow (CWE-122) CVE reference, VulDB · third-party-advisory
- https://github.com/LibreDWG/libredwg/issues/1241 CVE reference, VulDB · issue-tracking
- https://github.com/HackC0der/CVE-Repos/blob/main/libredwg/libredwg_6d6a339_heap_oob_write_read_2004_compressed_section.dwg CVE reference, VulDB · exploit
- https://www.gnu.org/ CVE reference, VulDB · product
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.
Improper Restriction of Operations within the Bounds of a Memory Buffer
Improper Restriction of Operations within the Bounds of a Memory Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Heap-based Buffer Overflow
Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.