DEBIAN-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 verification handlers for PE, MSI, CAB, and script files. An attacker can craft a malicious signed file with an oversized digest field in SpcIndirectDataContent. When a user verifies such a file with osslsigncode verify, the unbounded memcpy can overflow the stack buffer and corrupt adjacent stack state. This vulnerability is fixed in 2.12.
DEBIAN-CVE-2026-39853
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-2026-39853
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/versions2.9-2Source reference:
/affected/2/versions - Fixed versions
- 2.12-1
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-2026-39853.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-2026-39853.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.12-1"
}
]
}
],
"package": {
"name": "osslsigncode",
"purl": "pkg:deb/debian/osslsigncode?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.10-1",
"2.11-1",
"2.9-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39853.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56885 · Revision 1
- Added to Heist Feed
- Publisher date