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CVE-2026-39855

osslsigncode is a tool that implements Authenticode signing and timestamping. Prior to 2.13, an integer underflow vulnerability exists in osslsigncode version 2.12 and earlier in the PE page-hash computation code (pe_page_hash_calc()). When page hash processing is performed on a PE file, the function subtracts hdrsize from pagesize without first validating that pagesize >= hdrsize. If a malicious PE file sets SizeOfHeaders (hdrsize) larger than SectionAlignment (pagesize), the subtraction underf
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4061821ce6b44979393019eb20ba0a304a3b9f263df7bf4cbfd103017cabbec1
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 3 assertions

{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:10ecf4f3df71e8044399e32a9128821a32c81f47efa6e712879a8dc634eb9d01 · sha256:54eb917b68bc3814… · /containers/cna/problemTypes/1/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:v2:10ecf4f3df71e8044399e32a9128821a32c81f47efa6e712879a8dc634eb9d01 · sha256:54eb917b68bc3814… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-191","description":"CWE-191: Integer Underflow (Wrap or Wraparound)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:10ecf4f3df71e8044399e32a9128821a32c81f47efa6e712879a8dc634eb9d01 · sha256:54eb917b68bc3814… · /containers/cna/problemTypes/2/descriptions/0

Affected products and versions

1 source assertion
{"product":"osslsigncode","vendor":"mtrojnar","versions":[{"status":"affected","version":"< 2.13"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:10ecf4f3df71e8044399e32a9128821a32c81f47efa6e712879a8dc634eb9d01 · sha256:54eb917b68bc3814… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":5.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:10ecf4f3df71e8044399e32a9128821a32c81f47efa6e712879a8dc634eb9d01 · sha256:54eb917b68bc3814… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:10ecf4f3df71e8044399e32a9128821a32c81f47efa6e712879a8dc634eb9d01 · sha256:54eb917b68bc3814… · /containers/cna/problemTypes/1/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:v2:10ecf4f3df71e8044399e32a9128821a32c81f47efa6e712879a8dc634eb9d01 · sha256:54eb917b68bc3814… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-191","description":"CWE-191: Integer Underflow (Wrap or Wraparound)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:10ecf4f3df71e8044399e32a9128821a32c81f47efa6e712879a8dc634eb9d01 · sha256:54eb917b68bc3814… · /containers/cna/problemTypes/2/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/mtrojnar/osslsigncode/commit/2a5409b7c4b6c6fad2b093531e8fea6cf08e1568","tags":["x_refsource_MISC"],"url":"https://github.com/mtrojnar/osslsigncode/commit/2a5409b7c4b6c6fad2b093531e8fea6cf08e1568"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:10ecf4f3df71e8044399e32a9128821a32c81f47efa6e712879a8dc634eb9d01 · sha256:54eb917b68bc3814… · /containers/cna/references/1
{"name":"https://github.com/mtrojnar/osslsigncode/releases/tag/2.13","tags":["x_refsource_MISC"],"url":"https://github.com/mtrojnar/osslsigncode/releases/tag/2.13"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:10ecf4f3df71e8044399e32a9128821a32c81f47efa6e712879a8dc634eb9d01 · sha256:54eb917b68bc3814… · /containers/cna/references/2
{"name":"https://github.com/mtrojnar/osslsigncode/security/advisories/GHSA-76vv-x5rr-q3mr","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mtrojnar/osslsigncode/security/advisories/GHSA-76vv-x5rr-q3mr"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:10ecf4f3df71e8044399e32a9128821a32c81f47efa6e712879a8dc634eb9d01 · sha256:54eb917b68bc3814… · /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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