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CVE-2026-55738

A stack-based buffer overflow exists in the raw_to_header() function in src/microtar.c in rxi microtar 0.1.0. The function copies the 100-byte name and linkname fields of a TAR header with strcpy() without guaranteeing null termination of the source. The POSIX ustar format permits these fixed-width fields to be fully populated with non-null bytes, so a crafted archive whose linkname field (followed by the trailing padding of the 512-byte raw header) contains no null terminator causes strcpy() to
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:c5661fde01ac0399c26615ff08319edd8dd2357c6a6131ba6da2380f430d2604
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:029f587c6f6c10f1b9af560947c9f9e6ceedc037577c9d110432b167948039a5 · sha256:7c84fc7df85bbb19… · /containers/cna/metrics/1/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:029f587c6f6c10f1b9af560947c9f9e6ceedc037577c9d110432b167948039a5 · sha256:7c84fc7df85bbb19… · /containers/cna/metrics/0/cvssV3_1
cwe · 2 assertions

{"cweId":"CWE-170","description":"CWE-170 Improper Null Termination","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:029f587c6f6c10f1b9af560947c9f9e6ceedc037577c9d110432b167948039a5 · sha256:7c84fc7df85bbb19… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-121","description":"CWE-121 Stack-based Buffer Overflow","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:029f587c6f6c10f1b9af560947c9f9e6ceedc037577c9d110432b167948039a5 · sha256:7c84fc7df85bbb19… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"collectionURL":"https://github.com/rxi/microtar","defaultStatus":"affected","product":"microtar","programFiles":["src/microtar.c"],"programRoutines":[{"name":"raw_to_header"}],"repo":"https://github.com/rxi/microtar","vendor":"rxi","versions":[{"status":"affected","version":"0.1.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:029f587c6f6c10f1b9af560947c9f9e6ceedc037577c9d110432b167948039a5 · sha256:7c84fc7df85bbb19… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:029f587c6f6c10f1b9af560947c9f9e6ceedc037577c9d110432b167948039a5 · sha256:7c84fc7df85bbb19… · /containers/cna/metrics/1/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:029f587c6f6c10f1b9af560947c9f9e6ceedc037577c9d110432b167948039a5 · sha256:7c84fc7df85bbb19… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-170","description":"CWE-170 Improper Null Termination","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:029f587c6f6c10f1b9af560947c9f9e6ceedc037577c9d110432b167948039a5 · sha256:7c84fc7df85bbb19… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-121","description":"CWE-121 Stack-based Buffer Overflow","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:029f587c6f6c10f1b9af560947c9f9e6ceedc037577c9d110432b167948039a5 · sha256:7c84fc7df85bbb19… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"tags":["product"],"url":"https://github.com/rxi/microtar"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:029f587c6f6c10f1b9af560947c9f9e6ceedc037577c9d110432b167948039a5 · sha256:7c84fc7df85bbb19… · /containers/cna/references/1
{"tags":["product"],"url":"https://github.com/rxi/microtar/blob/master/src/microtar.c#L111"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:029f587c6f6c10f1b9af560947c9f9e6ceedc037577c9d110432b167948039a5 · sha256:7c84fc7df85bbb19… · /containers/cna/references/0
{"name":"Vulnerable source code: src/microtar.c (raw_to_header)","tags":["technical-description"],"url":"https://raw.githubusercontent.com/rxi/microtar/master/src/microtar.c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:029f587c6f6c10f1b9af560947c9f9e6ceedc037577c9d110432b167948039a5 · sha256:7c84fc7df85bbb19… · /containers/cna/references/2

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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