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CVE-2026-2673

Issue summary: An OpenSSL TLS 1.3 server may fail to negotiate the expected preferred key exchange group when its key exchange group configuration includes the default by using the 'DEFAULT' keyword. Impact summary: A less preferred key exchange may be used even when a more preferred group is supported by both client and server, if the group was not included among the client's initial predicated keyshares. This will sometimes be the case with the new hybrid post-quantum groups, if the client ch
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:095677d9650fc304c8895b8c9e4952fd1b1d98a421a6d9c22445979d4a437349
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unaffected","product":"OpenSSL","vendor":"OpenSSL","versions":[{"lessThan":"3.6.2","status":"affected","version":"3.6.0","versionType":"semver"},{"lessThan":"3.5.6","status":"affected","version":"3.5.0","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1f8ca04f91b069aa828cff6ec053df1dc593652d45bde7b6e8e6ad81676b108d · sha256:e537adb4d027d55a… · /containers/cna/affected/0

{"defaultStatus":"unknown","product":"SIMATIC CN 4100","vendor":"Siemens","versions":[{"lessThan":"V5.0","status":"affected","version":"0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1f8ca04f91b069aa828cff6ec053df1dc593652d45bde7b6e8e6ad81676b108d · sha256:e537adb4d027d55a… · /containers/adp/2/affected/0

Affected products and versions

2 source assertions
{"defaultStatus":"unaffected","product":"OpenSSL","vendor":"OpenSSL","versions":[{"lessThan":"3.6.2","status":"affected","version":"3.6.0","versionType":"semver"},{"lessThan":"3.5.6","status":"affected","version":"3.5.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1f8ca04f91b069aa828cff6ec053df1dc593652d45bde7b6e8e6ad81676b108d · sha256:e537adb4d027d55a… · /containers/cna/affected/0
{"defaultStatus":"unknown","product":"SIMATIC CN 4100","vendor":"Siemens","versions":[{"lessThan":"V5.0","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1f8ca04f91b069aa828cff6ec053df1dc593652d45bde7b6e8e6ad81676b108d · sha256:e537adb4d027d55a… · /containers/adp/2/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1f8ca04f91b069aa828cff6ec053df1dc593652d45bde7b6e8e6ad81676b108d · sha256:e537adb4d027d55a… · /containers/adp/1/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-757","description":"CWE-757 Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1f8ca04f91b069aa828cff6ec053df1dc593652d45bde7b6e8e6ad81676b108d · sha256:e537adb4d027d55a… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"url":"http://www.openwall.com/lists/oss-security/2026/03/13/3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1f8ca04f91b069aa828cff6ec053df1dc593652d45bde7b6e8e6ad81676b108d · sha256:e537adb4d027d55a… · /containers/adp/0/references/0
{"url":"https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1f8ca04f91b069aa828cff6ec053df1dc593652d45bde7b6e8e6ad81676b108d · sha256:e537adb4d027d55a… · /containers/adp/2/references/0
{"name":"3.6.2 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/2157c9d81f7b0bd7dfa25b960e928ec28e8dd63f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1f8ca04f91b069aa828cff6ec053df1dc593652d45bde7b6e8e6ad81676b108d · sha256:e537adb4d027d55a… · /containers/cna/references/1
{"name":"3.5.6 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/85977e013f32ceb96aa034c0e741adddc1a05e34"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1f8ca04f91b069aa828cff6ec053df1dc593652d45bde7b6e8e6ad81676b108d · sha256:e537adb4d027d55a… · /containers/cna/references/2
{"name":"OpenSSL Advisory","tags":["vendor-advisory"],"url":"https://openssl-library.org/news/secadv/20260313.txt"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1f8ca04f91b069aa828cff6ec053df1dc593652d45bde7b6e8e6ad81676b108d · sha256:e537adb4d027d55a… · /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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