DEBIAN-CVE-2026-88052
Tesseract is an open source OCR engine. In version 5.5.3 and earlier, UNICHARSET::load_via_fgets in src/ccutil/unicharset.cpp trusts the declared unichar count as a loop bound and uses id as an unchecked index into the unichars vector. unichar_insert_backwards_compatible can leave the vector unchanged for an empty, duplicate, or already-encodable representation, causing id to become larger than unichars.size(). Subsequent set_* calls and the write to unichars[id].properties.enabled then write UNICHAR_PROPERTIES beyond the vector during initialization in both the default LSTM and legacy engines, causing heap corruption, a crash, or potentially controlled corruption. No fixed release is available as of this review.
DEBIAN-CVE-2026-88052
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-2026-88052
tesseract
Source reference: /affected/0/package/name
- Affected versions
- 5.3.0-2
Source reference:
/affected/0/versions5.3.3-1Source reference:
/affected/0/versions5.3.4-1Source reference:
/affected/0/versions5.3.4-1.1Source reference:
/affected/0/versions5.3.4-1.2Source reference:
/affected/0/versions5.3.4-1.3Source reference:
/affected/0/versions5.3.4-1.4Source reference:
/affected/0/versions5.5.0-1Source reference:
/affected/0/versions5.5.0-1.1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
tesseract
Source reference: /affected/1/package/name
- Affected versions
- 5.5.0-1
Source reference:
/affected/1/versions5.5.0-1.1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
tesseract
Source reference: /affected/2/package/name
- Affected versions
- 5.5.0-1
Source reference:
/affected/2/versions5.5.0-1.1Source reference:
/affected/2/versions - Fixed versions
- Not stated in this record
- 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": "tesseract",
"purl": "pkg:deb/debian/tesseract?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"5.3.0-2",
"5.3.3-1",
"5.3.4-1",
"5.3.4-1.1",
"5.3.4-1.2",
"5.3.4-1.3",
"5.3.4-1.4",
"5.5.0-1",
"5.5.0-1.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88052.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "tesseract",
"purl": "pkg:deb/debian/tesseract?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"5.5.0-1",
"5.5.0-1.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88052.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "tesseract",
"purl": "pkg:deb/debian/tesseract?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"5.5.0-1",
"5.5.0-1.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88052.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58553 · Revision 1
- Added to Heist Feed
- Publisher date