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NVD / CVE Program· CNA VulDB

CVE-2026-15520: GNU LibreDWG R2004 Section Decompression decode.c decompress_R2004_section heap-based overflow

Noroxi assessment

Priority: Monitor (action score 7/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.19% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: GNU LibreDWG 0.14.8396.
  • Severity is disputed: the assigning authority (CNA) scores it 4.8, NVD 1.9.

Low priority for now. Upgrade to GNU LibreDWG 0.14.8396 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A vulnerability was determined in GNU LibreDWG 0.13.4-154-g0b573035. This impacts the function decompress_R2004_section of the file src/decode.c of the component R2004 Section Decompression. Executing a manipulation can lead to heap-based buffer overflow. The attack requires local access. The exploit has been publicly disclosed and may be utilized. Upgrading to version 0.14.8396 will fix this issue. This patch is called 3d0f9fc2eddbd6579c99af3111c37c98f03475d0. You should upgrade the affected component.

LowCVSS 1.9 · v4.0—No exploit Fix available
Published
Jul 13, 2026
Updated
Oct 24, 2026
EPSS
0.1% · 9th percentile

Report tools

JSON

Action score

7

Monitor

Low priority for now.

CVSS
7 / 40 · 1.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulDB
4.8
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulDB). Independent of NVD's CPE analysis and usually ahead of it.

  • GNU LibreDWG

    • 0.14.8396not affected
    • 0.13.4-154-g0b573035affected

Same product

gnu: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-20914An issue was discovered in GNU LibreDWG through 0.9.3.
    40Plan
  • CVE-2022-35164LibreDWG v0.12.4.4608 & commit f2dea29 was discovered to contain a heap use-after-free via bit_copy_chain.
    39Monitor
  • CVE-2021-28237LibreDWG v0.12.3 was discovered to contain a heap-buffer overflow via decode_preR13.
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-15182Jul 9, 2026 · GNU LibreDWG BMP Image dwg.c dwg_bmp heap-based overflow
    7Monitor
  • ← EarlierCVE-2026-15184Jul 9, 2026 · GNU LibreDWG DWG File dwg.c dwg_next_entity null pointer dereference
    7Monitor
  • Later →CVE-2026-90622Sep 14, 2026 · GNU libredwg Layer Encoding dwg.spec DWG_TABLE null pointer dereference
    7Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
GNU LibreDWG0.14.8396 · descriptionVendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-960548 days apartGNU libredwg Dwgbmp Utility bits.c bit_read_RC heap-based overflow
    22Monitor
  • CVE-2026-151824 days apartGNU LibreDWG BMP Image dwg.c dwg_bmp heap-based overflow
    7Monitor
  • CVE-2026-953048 days apartGNU LibreDWG Dwgbmp Utility decode.c read_2004_compressed_section out-of-bounds
    7Monitor
  • CVE-2026-950049 days apartGNU LibreDWG Dwgread Utility decode.c read_2004_compressed_section heap-based overflow
    7Monitor
  • CVE-2026-950249 days apartGNU LibreDWG Dwgread Utility decode.c decompress_R2004_section heap-based overflow
    7Monitor
  • CVE-2026-950449 days apartGNU LibreDWG Dwggrep Utility dwggrep.c bit_convert_TU out-of-bounds
    7Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records