HOMEVULNERABILITIESCVE-2026-32777
MEDIUM

CVE-2026-32777

CWE-835Published: March 16, 2026· Updated: Mar 17, 2026

5.5
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:1.2th

Official Description

libexpat before 2.7.5 allows an infinite loop while parsing DTD content.

NVD Source

Technical Analysis

CVE-2026-32777 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

libexpat_project1 product
libexpat
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/libexpat/libexpat/pull/1159
PATCHhttps://github.com/libexpat/libexpat/pull/1162
ADVISORYhttps://github.com/libexpat/libexpat/issues/1161

News & Research Mentioning CVE-2026-32777

Hitachi Energy RTU500
CISA Alerts· Jun 4, 2026

View CSAF Summary Hitachi Energy is aware of vulnerabilities that affect RTU500 product versions listed in this document. If exploited, these vulnerabilities primarily impact product availability, with potential secondary impacts on confidentiality and integrity. Please refer to the Recommended Immediate Actions for information about the mitigation/remediation. The following versions of Hitachi Energy RTU500 are affected: RTU500 series CMU Firmware vers:RTU500_series_CMU_Firmware/>=12.7.1| =13.5.1| =13.6.1| =13.7.1| =13.7.1|<=13.7.7 (CVE-2025-69421, CVE-2026-24515, CVE-2026-25210, CVE-2026-32776, CVE-2026-32777, CVE-2026-32778, CVE-2026-8479, CVE-2025-69421, CVE-2026-24515, CVE-2026-25210, CVE-2026-32776, CVE-2026-32777, CVE-2026-32778, CVE-2026-8479 [xlite_meta score:73 src:CISA Alerts xlite_fp:e0302865b72e9b97b1771d4c965cf7af6cfe4bd6f8338fe2df4d820e2ee37607]

All References (4)

→
https://github.com/libexpat/libexpat/issues/1161Exploit · Issue Tracking · Vendor Advisory
→
https://github.com/libexpat/libexpat/pull/1159Issue Tracking · Patch
→
https://github.com/libexpat/libexpat/pull/1162Issue Tracking · Patch
→
https://issues.oss-fuzz.com/issues/486993411Permissions Required

Quick Facts

CVE IDCVE-2026-32777
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-835
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedMar 16, 2026

Related CVEs (CWE-835)

CVE-2026-39806
8.7
CVE-2026-54904
7.5
CVE-2025-71319
7.5
CVE-2026-6519
7.5
CVE-2026-7375
7.5
CVE-2026-27114
7.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-32777 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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