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01 Record

CVE-2026-35199

SymCrypt SymCryptXmssSign function - Heap overflow via 64->32-bit leaf-count truncation

MediumPUBLISHEDCNA: GitHub_M
CNA base score6.1 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

02 Description

SymCrypt SymCryptXmssSign function - Heap overflow via 64->32-bit leaf-count truncation

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
0.28% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 20.3% of scored records. A rank, not a probability.
NVD base score
6.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
NVD analysis status
Analyzed. NVD last modified this record on 2026-07-24.
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
2026-04-06 19:44Z6 MO AGO
Last updated
2026-04-07 15:10Z6 MO AGO
Reserved
2026-04-01
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Medium (CVSS 6.1)
CNA CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Weaknesses
  • CWE-122Heap-based Buffer OverflowVariant
Data version
5.2
Document digest
6cde55a39ab1258fb91af5b1c3dc1162a68fa20df4a55002434284ca7f2db880

05 Affected products

VendorProductVersionsPlatforms
microsoftSymCrypt>= 103.5.0, < 103.11.0—

06 References