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CVE-2026-34876

An issue was discovered in Mbed TLS 3.x before 3.6.6. An out-of-bounds read vulnerability in mbedtls_ccm_finish() in library/ccm.c allows attackers to obtain adjacent CCM context data via invocation of the multipart CCM API with an oversized tag_len parameter. This is caused by missing validation of the tag_len parameter against the size of the internal 16-byte authentication buffer. The issue affects the public multipart CCM API in Mbed TLS 3.x, where mbedtls_ccm_finish() can be invoked directl
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a5f1a71308d7d0c6595742a5a4d0f458d4b9c08da5b16039a0e04496b4ccb20d
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

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

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8049310f6ad6c8c5a8926111197c907396de9acc1d5e320c56d523baf64abc69 · sha256:95f5227a7eab42ce… · /containers/cna/problemTypes/0/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:v2:8049310f6ad6c8c5a8926111197c907396de9acc1d5e320c56d523baf64abc69 · sha256:95f5227a7eab42ce… · /containers/adp/0/problemTypes/0/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:v2:8049310f6ad6c8c5a8926111197c907396de9acc1d5e320c56d523baf64abc69 · sha256:95f5227a7eab42ce… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8049310f6ad6c8c5a8926111197c907396de9acc1d5e320c56d523baf64abc69 · sha256:95f5227a7eab42ce… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"description":"n/a","lang":"en","type":"text"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8049310f6ad6c8c5a8926111197c907396de9acc1d5e320c56d523baf64abc69 · sha256:95f5227a7eab42ce… · /containers/cna/problemTypes/0/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:v2:8049310f6ad6c8c5a8926111197c907396de9acc1d5e320c56d523baf64abc69 · sha256:95f5227a7eab42ce… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

2 source assertions
{"url":"https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-ccm-finish-boundary-check/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8049310f6ad6c8c5a8926111197c907396de9acc1d5e320c56d523baf64abc69 · sha256:95f5227a7eab42ce… · /containers/cna/references/1
{"url":"https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8049310f6ad6c8c5a8926111197c907396de9acc1d5e320c56d523baf64abc69 · sha256:95f5227a7eab42ce… · /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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