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CVE-2026-48510

MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7, when MessagePack-CSharp decompresses Lz4Block or Lz4BlockArray payloads, it reads declared uncompressed lengths from the wire and allocates output buffers based on those lengths before validating that the compressed data is valid or that the declared expansion is reasonable. A small payload can claim a very large uncompressed length and force a large allocation before LZ4 decoding begins. This vulnerability is fix
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:91866094e4b52b591e38f8a5a60d20563cb31bddb8747a23ac22bfd55afcc581
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-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e7c45ba8d86cc397921e08515fb61ec8d7dd29683662ec70e7b6974829af42c4 · sha256:7a5b02e53d4efb32… · /containers/cna/problemTypes/1/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:e7c45ba8d86cc397921e08515fb61ec8d7dd29683662ec70e7b6974829af42c4 · sha256:7a5b02e53d4efb32… · /containers/cna/problemTypes/0/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:e7c45ba8d86cc397921e08515fb61ec8d7dd29683662ec70e7b6974829af42c4 · sha256:7a5b02e53d4efb32… · /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:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e7c45ba8d86cc397921e08515fb61ec8d7dd29683662ec70e7b6974829af42c4 · sha256:7a5b02e53d4efb32… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e7c45ba8d86cc397921e08515fb61ec8d7dd29683662ec70e7b6974829af42c4 · sha256:7a5b02e53d4efb32… · /containers/cna/problemTypes/1/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:e7c45ba8d86cc397921e08515fb61ec8d7dd29683662ec70e7b6974829af42c4 · sha256:7a5b02e53d4efb32… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-v72x-2h86-7f8m","tags":["x_refsource_CONFIRM"],"url":"https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-v72x-2h86-7f8m"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e7c45ba8d86cc397921e08515fb61ec8d7dd29683662ec70e7b6974829af42c4 · sha256:7a5b02e53d4efb32… · /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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