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CVE-2026-48502

MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7, MessagePackReader.ReadDateTime() can allocate stack memory based on an attacker-controlled MessagePack extension length. In the slow path for timestamp extension parsing, the computed tokenSize includes the extension body length from the wire and is used in a stackalloc operation before the extension length is validated as one of the valid timestamp sizes. A very small payload can claim a large timestamp extension
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f601a8f79494d6d117e7b7ed5ae4fc41cdba955b48900e71c252ebc3ab73e7f9
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 9 assertions

{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-674","description":"CWE-674: Uncontrolled Recursion","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/6/descriptions/0

{"cweId":"CWE-407","description":"CWE-407: Inefficient Algorithmic Complexity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/2/descriptions/0

{"cweId":"CWE-1188","description":"CWE-1188: Insecure Default Initialization of Resource","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/8/descriptions/0

{"cweId":"CWE-502","description":"CWE-502: Deserialization of Untrusted Data","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/5/descriptions/0

{"cweId":"CWE-125","description":"CWE-125: Out-of-bounds Read","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-470","description":"CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/4/descriptions/0

{"cweId":"CWE-409","description":"CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/3/descriptions/0

{"cweId":"CWE-789","description":"CWE-789: Memory Allocation with Excessive Size Value","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/7/descriptions/0

Affected products and versions

1 source assertion
{"product":"MessagePack-CSharp","vendor":"MessagePack-CSharp","versions":[{"status":"affected","version":">= 3.1.7, < 3.1.7"},{"status":"affected","version":"< 2.5.301"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

9 source assertions
{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-674","description":"CWE-674: Uncontrolled Recursion","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/6/descriptions/0
{"cweId":"CWE-407","description":"CWE-407: Inefficient Algorithmic Complexity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/2/descriptions/0
{"cweId":"CWE-1188","description":"CWE-1188: Insecure Default Initialization of Resource","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/8/descriptions/0
{"cweId":"CWE-502","description":"CWE-502: Deserialization of Untrusted Data","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/5/descriptions/0
{"cweId":"CWE-125","description":"CWE-125: Out-of-bounds Read","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-470","description":"CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/4/descriptions/0
{"cweId":"CWE-409","description":"CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/3/descriptions/0
{"cweId":"CWE-789","description":"CWE-789: Memory Allocation with Excessive Size Value","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/problemTypes/7/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-382j-8mxh-c7x2","tags":["x_refsource_CONFIRM"],"url":"https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-382j-8mxh-c7x2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:dfac96072d6ce3126ff6cf813827a86e485b75228194d1ce65df6142de08d8e2 · sha256:ae36d4cbcd41bc71… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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