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CVE-2026-48517

MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7, MessagePack-CSharp's typeless deserialization includes MessagePackSerializerOptions.ThrowIfDeserializingTypeIsDisallowed(Type) as a safety check for dangerous types. The default implementation checks the outer type name, but it does not recursively inspect array element types or generic type arguments. As a result, a type that would be blocked directly can be wrapped inside an array or constructed generic type and
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7f2b215ab116c228c78b083711ecf01bcee637647dde3cc86d398308b7d6e52a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"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:v2:7d1839ddce2d50c0d9fb03e1994b5718ad07b5ecb9bfa482376b90436fc14c00 · sha256:6c0cbe7f7c4645d5… · /containers/cna/problemTypes/0/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:v2:7d1839ddce2d50c0d9fb03e1994b5718ad07b5ecb9bfa482376b90436fc14c00 · sha256:6c0cbe7f7c4645d5… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"MessagePack-CSharp","vendor":"MessagePack-CSharp","versions":[{"status":"affected","version":">= 3.0, < 3.1.7"},{"status":"affected","version":"< 2.5.301"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7d1839ddce2d50c0d9fb03e1994b5718ad07b5ecb9bfa482376b90436fc14c00 · sha256:6c0cbe7f7c4645d5… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","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:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7d1839ddce2d50c0d9fb03e1994b5718ad07b5ecb9bfa482376b90436fc14c00 · sha256:6c0cbe7f7c4645d5… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"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:v2:7d1839ddce2d50c0d9fb03e1994b5718ad07b5ecb9bfa482376b90436fc14c00 · sha256:6c0cbe7f7c4645d5… · /containers/cna/problemTypes/0/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:v2:7d1839ddce2d50c0d9fb03e1994b5718ad07b5ecb9bfa482376b90436fc14c00 · sha256:6c0cbe7f7c4645d5… · /containers/cna/problemTypes/1/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-qhmf-xw27-6rqr","tags":["x_refsource_CONFIRM"],"url":"https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-qhmf-xw27-6rqr"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7d1839ddce2d50c0d9fb03e1994b5718ad07b5ecb9bfa482376b90436fc14c00 · sha256:6c0cbe7f7c4645d5… · /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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