DEBIAN-CVE-2026-39855

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Source
https://security-tracker.debian.org/tracker/CVE-2026-39855
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39855.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-39855
Upstream
  • CVE-2026-39855
Published
2026-04-09T17:16:29.140Z
Modified
2026-04-10T09:03:13.800798Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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 (pepagehash_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 underflows and produces a very large unsigned length. The code allocates a zero-filled buffer of pagesize bytes and then attempts to hash pagesize - hdrsize bytes from that buffer. After the underflow, this results in an out-of-bounds read from the heap and can crash the process. The vulnerability can be triggered while signing a malicious PE file with page hashing enabled (-ph), or while verifying a malicious signed PE file that already contains page hashes. Verification of an already signed file does not require the verifier to pass -ph. This vulnerability is fixed in 2.13.

References

Affected packages

Debian:11 / osslsigncode

Package

Name
osslsigncode
Purl
pkg:deb/debian/osslsigncode?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.1-1
2.2-1
2.3.0-1
2.4-1
2.5-1
2.5-2
2.5-3
2.5-4~deb11u1
2.5-4
2.5-4~deb11u1+really2.9-1+deb11u2
2.8-1
2.8-2
2.9-1~bpo12+1
2.9-1
2.9-2
2.10-1
2.11-1
2.12-1
2.13-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39855.json"

Debian:12 / osslsigncode

Package

Name
osslsigncode
Purl
pkg:deb/debian/osslsigncode?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.5-4
2.8-1
2.8-2
2.9-1~bpo12+1
2.9-1
2.9-2
2.10-1
2.11-1
2.12-1
2.13-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39855.json"

Debian:13 / osslsigncode

Package

Name
osslsigncode
Purl
pkg:deb/debian/osslsigncode?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.9-2
2.10-1
2.11-1
2.12-1
2.13-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39855.json"

Debian:14 / osslsigncode

Package

Name
osslsigncode
Purl
pkg:deb/debian/osslsigncode?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.13-1

Affected versions

2.*
2.9-2
2.10-1
2.11-1
2.12-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39855.json"