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CVE-2026-58317

Unsigned to Signed Conversion Error (CWE-196) vulnerability exists in TTSSH2 plugin of Tera Term provided by TeraTerm Project. When Tera Term attempts to establish an SSH connection to a server set up by an attacker, out-of-bounds read/write may occur. As a result, the contents of adjacent memory regions may be transmitted to the server, and Tera Term may behave unexpected or terminate abnormally.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:e52146f90aa324de227caff8904b4507b0369af17b33453000eac8284e21352f
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"baseScore":5.1,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4cf62369ca976b51c39aa1e01f6681c14b3f0675e6e5cf1a66c37df683091023 · sha256:bbf632246d577dbe… · /containers/cna/metrics/1/cvssV4_0

{"metric":{"baseScore":6.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L","version":"3.0"},"metric_type":"cvssV3_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4cf62369ca976b51c39aa1e01f6681c14b3f0675e6e5cf1a66c37df683091023 · sha256:bbf632246d577dbe… · /containers/cna/metrics/0/cvssV3_0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"TTSSH2","vendor":"TeraTerm Project","versions":[{"lessThanOrEqual":"3.6.1","status":"affected","version":"1.00 alpha1","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4cf62369ca976b51c39aa1e01f6681c14b3f0675e6e5cf1a66c37df683091023 · sha256:bbf632246d577dbe… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"baseScore":5.1,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4cf62369ca976b51c39aa1e01f6681c14b3f0675e6e5cf1a66c37df683091023 · sha256:bbf632246d577dbe… · /containers/cna/metrics/1/cvssV4_0
{"metric":{"baseScore":6.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L","version":"3.0"},"metric_type":"cvssV3_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4cf62369ca976b51c39aa1e01f6681c14b3f0675e6e5cf1a66c37df683091023 · sha256:bbf632246d577dbe… · /containers/cna/metrics/0/cvssV3_0

CWE assertions

1 source assertion
{"cweId":"CWE-196","description":"Unsigned to signed conversion error","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4cf62369ca976b51c39aa1e01f6681c14b3f0675e6e5cf1a66c37df683091023 · sha256:bbf632246d577dbe… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"url":"https://jvn.jp/en/jp/JVN65294474/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4cf62369ca976b51c39aa1e01f6681c14b3f0675e6e5cf1a66c37df683091023 · sha256:bbf632246d577dbe… · /containers/cna/references/2
{"url":"https://teratermproject.github.io/SA/JVN65294474-en.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4cf62369ca976b51c39aa1e01f6681c14b3f0675e6e5cf1a66c37df683091023 · sha256:bbf632246d577dbe… · /containers/cna/references/0
{"url":"https://teratermproject.github.io/SA/JVN65294474.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4cf62369ca976b51c39aa1e01f6681c14b3f0675e6e5cf1a66c37df683091023 · sha256:bbf632246d577dbe… · /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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