CVE-2026-111677Proof of concept (PoC) published · CISA

Antiword through 0.37 Heap Out-of-Bounds Read via vGet8LstInfo in prop8.c

CVSS score

6.8

EPSS probability

%0.2

Risk score

0.0

Published

1 d ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

Only the personal products you have added to your account are assessed; an organisation's inventory does not appear here.

Checking session…

Vulnerability description

CVE AI research

The stored explanation is shown at once; refreshing evaluates the sources again.

DayBreach AI Explanation

Verified against sources

Antiword Heap Out-of-Bounds Read Vulnerability in CVE-2026-111677

Sources read

Source agreement

0/2

Evidence confidence

%44

Short explanation

Antiword through 0.37 contains a heap out-of-bounds read vulnerability in vGet8LstInfo within prop8.c, caused by an inverted bounds check on the PlcfLst record count.

Why does it matter?

Attackers can supply a crafted Word 8 .doc file to trigger heap out-of-bounds reads that crash the process.

What should be done?

Follow vendor advisories

Note on uncertainty

2 alanda kaynak uyuşmazlığı var. DayBreach bu değerleri saklamadı; kaynak karşılaştırması aşağıda gösteriliyor.

Chain of evidence and sources2 verified claims

Antiword 0.37 ve önceki sürümler prop8.c içinde vGet8LstInfo yığın sınır dışı okuma zafiyeti içermektedir.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Zafiyet, PlcfLst kayıt sayısındaki ters çevrilmiş bir sınır kontrolünden kaynaklanmaktadır.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Show the technical text from the sources

Antiword through 0.37 contains a heap out-of-bounds read vulnerability in vGet8LstInfo in prop8.c caused by an inverted bounds check on the PlcfLst record count. Attackers can supply a crafted Word 8 .doc file claiming up to 0xffff LSTF records in a tiny buffer, causing reads past the heap allocation that crash the process.

CVSS vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CWE: CWE-125

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-111677 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	Adri van Os	antiword	View
2	debian	antiword (sid)	View
3	debian	antiword (forky)	View
4	debian	antiword (trixie)	View
5	debian	antiword (bookworm)	View

Total affected vendors: 2|Products: 5

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
6.8	CVSS V40	MEDIUM	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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
6.8	CVSS V4_0	MEDIUM	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	CVE CNA
5.5	CVSS V31	MEDIUM	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	NVD
5.5	CVSS V3_1	MEDIUM	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	CVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-111677 is associated with the following CWEs:

CWE-125: Out-of-bounds Read

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-111677 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim

PermissionsGerekmiyor

User—

Official Sources and Advisories

https://hackmd.io/@haindpwn/antiword-word8-plcflst-count-and-fkp-run-oob-readvendor-advisory https://github.com/rsdoiel/antiword/blob/fe4b579067122a2d9d62647efb1ee7cfe3ca92bb/prop8.c#L799-L825vendor-advisory VulnCheck Advisory: Antiword through 0.37 Heap Out-of-Bounds Read via vGet8LstInfo in prop8.cvendor-advisory https://security-tracker.debian.org/tracker/CVE-2026-111677vendor-advisory

CVSS Vector Radar Chart

6.8 / 10

Vulnerability Scoring Details

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone required

User InteractionP

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)P

Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

Adri van Os

debian

Weakness Type (CWE & CAPEC)

CWE-125

Similar Vulnerabilities

10.0

CVE-2021-44228 Actively exploitedImproper input validation in Apache Log4j

Vendorsiemens Product6bk1602-0aa12-0tp0 firmware+16 etkilenen

Patch verified Public Exploits:22EPSS %1004 y ago

10.0

CVE-2015-3306 Actively exploitedImproper access control in N/a

Vendorn/a Productn/a+10 etkilenen

Workaround Public Exploits:5EPSS %9911 y ago

9.8

CVE-2020-1938 Actively exploitedVulnerability in Apache Tomcat

Vendorapache Productgeode+16 etkilenen

Patch verified Public Exploits:12EPSS %996 y ago

9.8

CVE-2022-30333 Actively exploitedPath traversal in N/a

Vendorn/a Productn/a+8 etkilenen

Patch verifiedEPSS %994 y ago

9.8

CVE-2026-24061 Actively exploitedVulnerability in GNU Inetutils

Vendorgnu ProductInetUtils+2 etkilenen

Patch verified Public Exploits:2EPSS %999 mo ago

9.8

CVE-2012-0507 Actively exploitedVulnerability in N/a

Vendorn/a Productn/a+24 etkilenen

Partial patch Public Exploits:1EPSS %9814 y ago

Get this vulnerability through the API

Affected products, version ranges, exploitation status and patch information in a single request, with a free key.

Get a free key Documentation

curl -H "x-api-key: $DAYBREACH_API_KEY" \
  "https://api.daybreach.dev/api/v1/intel/cves/CVE-2026-111677"