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CVE-2026-34877

An issue was discovered in Mbed TLS versions from 2.19.0 up to 3.6.5, Mbed TLS 4.0.0. Insufficient protection of serialized SSL context or session structures allows an attacker who can modify the serialized structures to induce memory corruption, leading to arbitrary code execution. This is caused by Incorrect Use of Privileged APIs.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:c715b95f162f0bd5eaf5d749b55fe7045be37fbcf009c719340923fa39e63e31
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 3 assertions

{"description":"n/a","lang":"en","type":"text"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c433eeb6bcfd941c2c838dee3e86246895e9ae02a6bba5fbae50daac3cff46bd · sha256:2348a30eb4c00004… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-250","description":"CWE-250 Execution with Unnecessary Privileges","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c433eeb6bcfd941c2c838dee3e86246895e9ae02a6bba5fbae50daac3cff46bd · sha256:2348a30eb4c00004… · /containers/adp/0/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:c433eeb6bcfd941c2c838dee3e86246895e9ae02a6bba5fbae50daac3cff46bd · sha256:2348a30eb4c00004… · /containers/adp/0/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"n/a","vendor":"n/a","versions":[{"status":"affected","version":"n/a"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c433eeb6bcfd941c2c838dee3e86246895e9ae02a6bba5fbae50daac3cff46bd · sha256:2348a30eb4c00004… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c433eeb6bcfd941c2c838dee3e86246895e9ae02a6bba5fbae50daac3cff46bd · sha256:2348a30eb4c00004… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"description":"n/a","lang":"en","type":"text"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c433eeb6bcfd941c2c838dee3e86246895e9ae02a6bba5fbae50daac3cff46bd · sha256:2348a30eb4c00004… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-250","description":"CWE-250 Execution with Unnecessary Privileges","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c433eeb6bcfd941c2c838dee3e86246895e9ae02a6bba5fbae50daac3cff46bd · sha256:2348a30eb4c00004… · /containers/adp/0/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:c433eeb6bcfd941c2c838dee3e86246895e9ae02a6bba5fbae50daac3cff46bd · sha256:2348a30eb4c00004… · /containers/adp/0/problemTypes/1/descriptions/0

Source references

2 source assertions
{"url":"https://mbed-tls.readthedocs.io/en/latest/security-advisories/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c433eeb6bcfd941c2c838dee3e86246895e9ae02a6bba5fbae50daac3cff46bd · sha256:2348a30eb4c00004… · /containers/cna/references/0
{"url":"https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-serialized-data/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c433eeb6bcfd941c2c838dee3e86246895e9ae02a6bba5fbae50daac3cff46bd · sha256:2348a30eb4c00004… · /containers/cna/references/1

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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