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CVE-2026-39853

osslsigncode is a tool that implements Authenticode signing and timestamping. Prior to 2.12, A stack buffer overflow vulnerability exists in osslsigncode in several signature verification paths. During verification of a PKCS#7 signature, the code copies the digest value from a parsed SpcIndirectDataContent structure into a fixed-size stack buffer (mdbuf[EVP_MAX_MD_SIZE], 64 bytes) without validating that the source length fits within the destination buffer. This pattern is present in the verifi
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:c26307e8c08db470a210f21c0ba578d944c5a2ecc4e5c68e46b72a16ce83c979
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

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

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e1211ca1aa4f878e06eb8c28db73b116c97b4c84b0d174763c831dde7e231f16 · sha256:d1eb66fd2fb3fbe9… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e1211ca1aa4f878e06eb8c28db73b116c97b4c84b0d174763c831dde7e231f16 · sha256:d1eb66fd2fb3fbe9… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"osslsigncode","vendor":"mtrojnar","versions":[{"status":"affected","version":"< 2.12"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e1211ca1aa4f878e06eb8c28db73b116c97b4c84b0d174763c831dde7e231f16 · sha256:d1eb66fd2fb3fbe9… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/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:e1211ca1aa4f878e06eb8c28db73b116c97b4c84b0d174763c831dde7e231f16 · sha256:d1eb66fd2fb3fbe9… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-121","description":"CWE-121: Stack-based Buffer Overflow","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e1211ca1aa4f878e06eb8c28db73b116c97b4c84b0d174763c831dde7e231f16 · sha256:d1eb66fd2fb3fbe9… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e1211ca1aa4f878e06eb8c28db73b116c97b4c84b0d174763c831dde7e231f16 · sha256:d1eb66fd2fb3fbe9… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68","tags":["x_refsource_MISC"],"url":"https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e1211ca1aa4f878e06eb8c28db73b116c97b4c84b0d174763c831dde7e231f16 · sha256:d1eb66fd2fb3fbe9… · /containers/cna/references/1
{"name":"https://github.com/mtrojnar/osslsigncode/releases/tag/2.12","tags":["x_refsource_MISC"],"url":"https://github.com/mtrojnar/osslsigncode/releases/tag/2.12"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e1211ca1aa4f878e06eb8c28db73b116c97b4c84b0d174763c831dde7e231f16 · sha256:d1eb66fd2fb3fbe9… · /containers/cna/references/2
{"name":"https://github.com/mtrojnar/osslsigncode/security/advisories/GHSA-hx87-8754-xvh4","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mtrojnar/osslsigncode/security/advisories/GHSA-hx87-8754-xvh4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e1211ca1aa4f878e06eb8c28db73b116c97b4c84b0d174763c831dde7e231f16 · sha256:d1eb66fd2fb3fbe9… · /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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