Analyst readout for executives and security teams
Plain-English summary
CVE-2026-9502 is a heap buffer overflow in GNU LibreDWG’s dwgread utility. It is not described as remotely exploitable; the source says local access is required. Business urgency is moderate because affected versions are broad, a public exploit is referenced, and malformed DWG handling may affect CAD processing workflows.
Executive priority
Treat as a moderate-priority engineering remediation. Prioritize environments that process external DWG files or run LibreDWG in automated pipelines. There is no confirmed active exploitation in the supplied sources, but public exploit availability increases the need for timely patching.
Technical view
GNU LibreDWG versions 0.1 through 0.14 are affected in src/decode.c, function decompress_R2004_section. The issue is classified as CWE-119/CWE-122 heap-based buffer overflow with CVSS 3.1 score 5.3, vector AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L. Patch commit e501cb9926c1e9a07a0d1cc997f3e69e9be801c9 is identified.
Likely exposure
Exposure is likely where GNU LibreDWG 0.14 or earlier is installed, especially systems that run dwgread or process DWG files in CAD conversion, analysis, or automation workflows. The bundle does not identify downstream products or distributions.
Exploitation context
The source bundle says the attack must be carried out locally and that exploit material is publicly available and might be used. KEV is false, and no cited source confirms active exploitation in the wild.
Researcher notes
Evidence is specific to GNU LibreDWG and dwgread’s R2004 section decompression path. Do not assume remote reachability or affected third-party products from the bundle. Validation should focus on version, code provenance, and whether local users or workflows can feed DWG content to dwgread.
Mitigation direction
- Apply the vendor patch identified as commit e501cb9926c1e9a07a0d1cc997f3e69e9be801c9.
- Upgrade GNU LibreDWG beyond affected versions when a fixed release is available.
- Review LibreDWG issue and vendor guidance for release-specific remediation instructions.
- Limit untrusted DWG processing on systems that cannot be patched promptly.
Validation and detection
- Inventory systems for GNU LibreDWG versions 0.1 through 0.14.
- Check whether dwgread is installed or used in automated DWG workflows.
- Verify the deployed code includes patch commit e501cb9926c1e9a07a0d1cc997f3e69e9be801c9.
- Confirm remediation with the relevant package manager or source build metadata.
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-2026-9502 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:O/RC:C
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:O/RC:C 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:O/RC:C 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:OF/RC:C 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:O/RC:C
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:O/RC:C
Base CVSS 2.0 score
4.3 MediumVector: AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C
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-365484 | GNU LibreDWG Dwgread Utility decode.c decompress_R2004_section heap-based overflow CVE reference, VulDB · vdb-entry, technical-description
- VDB-365484 | CTI Indicators (IOB, IOC, IOA) CVE reference, VulDB · signature, permissions-required
- Submit #814259 | 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/1243 CVE reference, VulDB · issue-tracking
- https://github.com/HackC0der/CVE-Repos/blob/main/libredwg/libredwg_6d6a339_heap_overflow_decompress_R2004_section.dwg CVE reference, VulDB · exploit
- https://github.com/LibreDWG/libredwg/commit/e501cb9926c1e9a07a0d1cc997f3e69e9be801c9 CVE reference, VulDB · patch
- 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.