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CVE-2026-57585

MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.1, there is an Out-of-bounds read/crash on Unpacker reuse after a caught error, potentially leading to a DoS attack. If the Unpacker is used repeatedly after an error occurs, the process may crash with a SEGV. This issue has been fixed in version 1.2.1.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:bbd398adf5282788ffff55acb7b61b9ff5a014460562883fb616440c785441a1
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"msgpack-python","vendor":"msgpack","versions":[{"status":"affected","version":"< 1.2.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9d1167f7964a7deef628200d5af93fd78f61b56b98268d04789ad8d24d606ac6 · sha256:ef3aa6c77ec684e5… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9d1167f7964a7deef628200d5af93fd78f61b56b98268d04789ad8d24d606ac6 · sha256:ef3aa6c77ec684e5… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-416","description":"CWE-416: Use After Free","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9d1167f7964a7deef628200d5af93fd78f61b56b98268d04789ad8d24d606ac6 · sha256:ef3aa6c77ec684e5… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d","tags":["x_refsource_MISC"],"url":"https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9d1167f7964a7deef628200d5af93fd78f61b56b98268d04789ad8d24d606ac6 · sha256:ef3aa6c77ec684e5… · /containers/cna/references/1
{"name":"https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964","tags":["x_refsource_CONFIRM"],"url":"https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9d1167f7964a7deef628200d5af93fd78f61b56b98268d04789ad8d24d606ac6 · sha256:ef3aa6c77ec684e5… · /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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