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01 Record

CVE-2026-83742

wstrncat() unsigned integer underflow leads to an off-by-one null write in wolfSSH on non-Windows platforms

MediumPUBLISHEDCNA: wolfSSL
CNA base score5.3 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/AU:N
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02 Description

wstrncat() unsigned integer underflow leads to an off-by-one null write in wolfSSH on non-Windows platforms

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • 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
0.43% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 37.3% of scored records. A rank, not a probability.
NVD base score
5.3 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/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:N/R:X/V:X/RE:X/U:X
NVD analysis status
Analyzed. NVD last modified this record on 2026-10-13.
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.

04 Metadata

Published
2026-10-07 02:41Z22 DAYS AGO
Last updated
2026-10-07 11:30Z22 DAYS AGO
Reserved
2026-08-31
Assigning CNA
wolfSSL
Record state
PUBLISHED
Severity
Medium (CVSS 5.3)
CNA CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/AU:N
Weaknesses
  • CWE-121Stack-based Buffer OverflowVariant
  • CWE-191Integer Underflow (Wrap or Wraparound)Base
  • CWE-193Off-by-one ErrorBase
Data version
5.2
Document digest
7e6c7ddc43d571ae6c4c113d8828eb67aac8b83428e0f322820f244821d3784d

05 Affected products

VendorProductVersionsPlatforms
wolfSSL Inc.wolfSSH1.4.11 to 1.5.0—

06 References