CVE-2026-3463

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.19% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 9.5% of scored records. A rank, not a probability.

NVD base score

1.9 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/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 analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-03-03 12:02Z6 MO AGO

Last updated

2026-03-03 14:48Z6 MO AGO

Reserved

2026-03-03

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 4.8)

CNA CVSS vector

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

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-122Heap-based Buffer OverflowVariant

Data version

5.2

Document digest

41a0ce6d4b910cd5377bbab10f1f8c3934f4085f29d733eb8c21fa099c56b4b6

• vuldb.comVDB-348530 | xlnt-community xlnt Compound Document binary.hpp append heap-based overflowhttps://vuldb.com/?id.348530vdb-entrytechnical-description
• vuldb.comVDB-348530 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/?ctiid.348530signaturepermissions-required
• vuldb.comSubmit #764643 | xlnt-community xlnt commit bceb706 and before Heap-based Buffer Overflowhttps://vuldb.com/?submit.764643third-party-advisory
• github.comhttps://github.com/xlnt-community/xlnt/issues/138issue-tracking
• github.comhttps://github.com/xlnt-community/xlnt/issues/138#issuecomment-3868381672issue-tracking
• github.comhttps://github.com/oneafter/0128/blob/main/xl2/reproexploit
• github.comhttps://github.com/xlnt-community/xlnt/pull/147issue-trackingpatch
• github.comhttps://github.com/xlnt-community/xlnt/product