Low Denial of service exploit reference

CVE-2026-9529 — GNU LibreDWG Dwggrep Utility dwggrep.c match_BLOCK_HEADER null pointer dereference

A security flaw has been discovered in GNU LibreDWG up to 0.14. The affected element is the function match_BLOCK_HEADER of the file dwggrep.c of the component Dwggrep Utility. Performing a manipulation results in null pointer dereference. The attack requires a local approach. The exploit has been released to the public and may be used for attacks.

Published May 26, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: VulDB

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1
CISA SSVC: exploitation "poc"+5

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.16%

ahead of 5% of scored CVEs · Oct 14, 2026

Affects

Gnu

Libredwg

CVSS base

3.3

Low · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Proof of concept

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Gnu Libredwg).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (denial of service), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Gnu	Libredwg	version 0.1version 0.2version 0.3version 0.4version 0.5version 0.6version 0.7version 0.8 and 6 more version 0.9version 0.10version 0.11version 0.12version 0.13version 0.14	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
4.8	CVSS 4.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP
1.9	CVSS 4.0	Low	—	—	cna@vuldb.com via NIST National Vulnerability Database
3.3	CVSS 3.1	Low	1.8	1.4	cna@vuldb.com via NIST National Vulnerability Database
3.3	CVSS 3.1	Low	—	—	VulDB via CVE Program (cve.org) e CISA ADP
3.3	CVSS 3.0	Low	—	—	VulDB via CVE Program (cve.org) e CISA ADP
1.7	CVSS 2.0	Low	3.1	2.9	cna@vuldb.com via NIST National Vulnerability Database
1.7	CVSS 2.0	Low	—	—	VulDB via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L (score shown at the top: cna@vuldb.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-404 · Improper Resource Shutdown or Release

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.16%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
Track CPU/memory spikes and availability drops correlated with request patterns.

endpoint telemetry (EDR)resource metrics

Timeline

What happened to this CVE, newest first.

2026
Affected products added · gnu/libredwg
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
CVSS changed · 3.3
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Deferred
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
May 26, 2026 · VulDB

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

6 on the record

github.com/LibreDWG/libredwg/issues/1247
issue-tracking, NIST National Vulnerability Database
vuldb.com/vuln/365548/cti
signature, permissions-required, NIST National Vulnerability Database
vuldb.com/vuln/365548
vdb-entry, technical-description, NIST National Vulnerability Database
www.gnu.org/
product, NIST National Vulnerability Database
vuldb.com/submit/814273
third-party-advisory, NIST National Vulnerability Database
github.com/HackC0der/CVE-Repos/blob/main/libredwg/libredwg_6d6a339_heap_oob_writ
exploit, NIST National Vulnerability Database

Elsewhere on this site

Gnu
every CVE for this vendor

Denial of service
same class

CWE-404
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-111167 GNU LibreDWG through 0.14.8612 Out-of-Bounds Read in acds_private AcDs Decoder 3h
Medium CVE-2026-15520 GNU LibreDWG R2004 Section Decompression decode.c decompress_R2004_section heap-based overflow Jul 12, 2026
Low CVE-2026-15184 GNU LibreDWG DWG File dwg.c dwg_next_entity null pointer dereference Jul 9, 2026
Medium CVE-2026-15182 GNU LibreDWG BMP Image dwg.c dwg_bmp heap-based overflow Jul 9, 2026
High CVE-2026-9605 GNU libredwg Dwgbmp Utility bits.c bit_read_RC heap-based overflow May 26, 2026
Low CVE-2026-9530 GNU LibreDWG Dwgbmp Utility decode.c read_2004_compressed_section out-of-bounds May 26, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-9529 is "GNU LibreDWG Dwggrep Utility dwggrep.c match_BLOCK_HEADER null pointer dereference", rated Low. It affects Libredwg (Gnu); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 3.3 describes technical severity. EPSS 0.16% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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