DEBIAN-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 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.
DEBIAN-CVE-2026-39855
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-39855
osslsigncode
Source reference: /affected/0/package/name
- Affected versions
- 2.10-1
Source reference:
/affected/0/versions2.11-1Source reference:
/affected/0/versions2.12-1Source reference:
/affected/0/versions2.13-1Source reference:
/affected/0/versions2.13-2Source reference:
/affected/0/versions2.14-1Source reference:
/affected/0/versions2.5-4Source reference:
/affected/0/versions2.8-1Source reference:
/affected/0/versions2.8-2Source reference:
/affected/0/versions2.9-1Source reference:
/affected/0/versions2.9-1~bpo12+1Source reference:
/affected/0/versions2.9-2Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
osslsigncode
Source reference: /affected/1/package/name
- Affected versions
- 2.10-1
Source reference:
/affected/1/versions2.11-1Source reference:
/affected/1/versions2.12-1Source reference:
/affected/1/versions2.13-1Source reference:
/affected/1/versions2.13-2Source reference:
/affected/1/versions2.14-1Source reference:
/affected/1/versions2.9-2Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
osslsigncode
Source reference: /affected/2/package/name
- Affected versions
- 2.10-1
Source reference:
/affected/2/versions2.11-1Source reference:
/affected/2/versions2.12-1Source reference:
/affected/2/versions2.9-2Source reference:
/affected/2/versions - Fixed versions
- 2.13-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "osslsigncode",
"purl": "pkg:deb/debian/osslsigncode?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.10-1",
"2.11-1",
"2.12-1",
"2.13-1",
"2.13-2",
"2.14-1",
"2.5-4",
"2.8-1",
"2.8-2",
"2.9-1",
"2.9-1~bpo12+1",
"2.9-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39855.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "osslsigncode",
"purl": "pkg:deb/debian/osslsigncode?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.10-1",
"2.11-1",
"2.12-1",
"2.13-1",
"2.13-2",
"2.14-1",
"2.9-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39855.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.13-1"
}
]
}
],
"package": {
"name": "osslsigncode",
"purl": "pkg:deb/debian/osslsigncode?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.10-1",
"2.11-1",
"2.12-1",
"2.9-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39855.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57583 · Revision 1
- Added to Heist Feed
- Publisher date