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Vulnerability Details :

CVE-2026-2703

Summary
Assigner-VulDB
Assigner Org ID-1af790b2-7ee1-4545-860a-a788eba489b5
Published At-19 Feb, 2026 | 04:02
Updated At-24 Feb, 2026 | 01:40
Rejected At-
Credits

xlnt-community xlnt Encrypted XLSX File base64.cpp decode_base64 off-by-one

A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::decode_base64 of the file source/detail/cryptography/base64.cpp of the component Encrypted XLSX File Parser. Executing a manipulation can lead to off-by-one. The attack requires local access. The exploit has been made available to the public and could be used for attacks. This patch is called f2d7bf494e5c52706843cf7eb9892821bffb0734. Applying a patch is advised to resolve this issue.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:VulDB
Assigner Org ID:1af790b2-7ee1-4545-860a-a788eba489b5
Published At:19 Feb, 2026 | 04:02
Updated At:24 Feb, 2026 | 01:40
Rejected At:
▼CVE Numbering Authority (CNA)
xlnt-community xlnt Encrypted XLSX File base64.cpp decode_base64 off-by-one

A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::decode_base64 of the file source/detail/cryptography/base64.cpp of the component Encrypted XLSX File Parser. Executing a manipulation can lead to off-by-one. The attack requires local access. The exploit has been made available to the public and could be used for attacks. This patch is called f2d7bf494e5c52706843cf7eb9892821bffb0734. Applying a patch is advised to resolve this issue.

Affected Products
Vendor
xlnt-community
Product
xlnt
Modules
  • Encrypted XLSX File Parser
Versions
Affected
  • 1.6.0
  • 1.6.1
Problem Types
TypeCWE IDDescription
CWECWE-193Off-by-One
CWECWE-189Numeric Error
Type: CWE
CWE ID: CWE-193
Description: Off-by-One
Type: CWE
CWE ID: CWE-189
Description: Numeric Error
Metrics
VersionBase scoreBase severityVector
4.04.8MEDIUM
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
3.13.3LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
3.03.3LOW
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
2.01.7N/A
AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C
Version: 4.0
Base score: 4.8
Base severity: MEDIUM
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
Version: 3.1
Base score: 3.3
Base severity: LOW
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
Version: 3.0
Base score: 3.3
Base severity: LOW
Vector:
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
Version: 2.0
Base score: 1.7
Base severity: N/A
Vector:
AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
reporter
Oneafter (VulDB User)
Timeline
EventDate
Advisory disclosed2026-02-18 00:00:00
VulDB entry created2026-02-18 01:00:00
VulDB entry last update2026-02-18 19:04:11
Event: Advisory disclosed
Date: 2026-02-18 00:00:00
Event: VulDB entry created
Date: 2026-02-18 01:00:00
Event: VulDB entry last update
Date: 2026-02-18 19:04:11
Replaced By
Rejected Reason
References
HyperlinkResource
https://vuldb.com/?id.346649
vdb-entry
technical-description
https://vuldb.com/?ctiid.346649
signature
permissions-required
https://vuldb.com/?submit.754377
third-party-advisory
https://github.com/xlnt-community/xlnt/issues/137
issue-tracking
https://github.com/oneafter/0128/blob/main/xl1/repro
exploit
https://github.com/xlnt-community/xlnt/commit/f2d7bf494e5c52706843cf7eb9892821bffb0734
patch
https://github.com/xlnt-community/xlnt/
product
Hyperlink: https://vuldb.com/?id.346649
Resource:
vdb-entry
technical-description
Hyperlink: https://vuldb.com/?ctiid.346649
Resource:
signature
permissions-required
Hyperlink: https://vuldb.com/?submit.754377
Resource:
third-party-advisory
Hyperlink: https://github.com/xlnt-community/xlnt/issues/137
Resource:
issue-tracking
Hyperlink: https://github.com/oneafter/0128/blob/main/xl1/repro
Resource:
exploit
Hyperlink: https://github.com/xlnt-community/xlnt/commit/f2d7bf494e5c52706843cf7eb9892821bffb0734
Resource:
patch
Hyperlink: https://github.com/xlnt-community/xlnt/
Resource:
product
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:cna@vuldb.com
Published At:19 Feb, 2026 | 07:17
Updated At:19 Feb, 2026 | 15:52

A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::decode_base64 of the file source/detail/cryptography/base64.cpp of the component Encrypted XLSX File Parser. Executing a manipulation can lead to off-by-one. The attack requires local access. The exploit has been made available to the public and could be used for attacks. This patch is called f2d7bf494e5c52706843cf7eb9892821bffb0734. Applying a patch is advised to resolve this issue.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.04.8MEDIUM
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
Primary3.13.3LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Secondary2.01.7LOW
AV:L/AC:L/Au:S/C:N/I:N/A:P
Type: Secondary
Version: 4.0
Base score: 4.8
Base severity: MEDIUM
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
Type: Primary
Version: 3.1
Base score: 3.3
Base severity: LOW
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Type: Secondary
Version: 2.0
Base score: 1.7
Base severity: LOW
Vector:
AV:L/AC:L/Au:S/C:N/I:N/A:P
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-189Primarycna@vuldb.com
CWE-193Primarycna@vuldb.com
CWE ID: CWE-189
Type: Primary
Source: cna@vuldb.com
CWE ID: CWE-193
Type: Primary
Source: cna@vuldb.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/oneafter/0128/blob/main/xl1/reprocna@vuldb.com
N/A
https://github.com/xlnt-community/xlnt/cna@vuldb.com
N/A
https://github.com/xlnt-community/xlnt/commit/f2d7bf494e5c52706843cf7eb9892821bffb0734cna@vuldb.com
N/A
https://github.com/xlnt-community/xlnt/issues/137cna@vuldb.com
N/A
https://vuldb.com/?ctiid.346649cna@vuldb.com
N/A
https://vuldb.com/?id.346649cna@vuldb.com
N/A
https://vuldb.com/?submit.754377cna@vuldb.com
N/A
Hyperlink: https://github.com/oneafter/0128/blob/main/xl1/repro
Source: cna@vuldb.com
Resource: N/A
Hyperlink: https://github.com/xlnt-community/xlnt/
Source: cna@vuldb.com
Resource: N/A
Hyperlink: https://github.com/xlnt-community/xlnt/commit/f2d7bf494e5c52706843cf7eb9892821bffb0734
Source: cna@vuldb.com
Resource: N/A
Hyperlink: https://github.com/xlnt-community/xlnt/issues/137
Source: cna@vuldb.com
Resource: N/A
Hyperlink: https://vuldb.com/?ctiid.346649
Source: cna@vuldb.com
Resource: N/A
Hyperlink: https://vuldb.com/?id.346649
Source: cna@vuldb.com
Resource: N/A
Hyperlink: https://vuldb.com/?submit.754377
Source: cna@vuldb.com
Resource: N/A

Change History

0
Information is not available yet

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