DEBIAN-CVE-2026-8796
Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input. In Perl/Decoder/srl_decoder.c, srl_read_object() and srl_read_hash() process a COPY tag, a back-reference whose target byte the decoder re-decodes as a fresh tag. When that target byte matches the SHORT_BINARY pattern (an inline string whose length is encoded in the low bits of the tag), the resulting read is not bounded to precede the COPY tag's own offset and can run past the end of the input buffer. An attacker controlled COPY offset can land inside a previously decoded value rather than on a tag boundary, planting a byte that the decoder reads as a SHORT_BINARY tag and consuming up to 31 following bytes from the heap as a class name (OBJECT path) or hash key (HASH path).
DEBIAN-CVE-2026-8796
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-2026-8796
libsereal-decoder-perl
Source reference: /affected/0/package/name
- Affected versions
- 5.003+ds-1
Source reference:
/affected/0/versions5.004+ds-1Source reference:
/affected/0/versions5.006+ds-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
libsereal-decoder-perl
Source reference: /affected/1/package/name
- Affected versions
- 5.004+ds-1
Source reference:
/affected/1/versions5.006+ds-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
libsereal-decoder-perl
Source reference: /affected/2/package/name
- Affected versions
- 5.004+ds-1
Source reference:
/affected/2/versions - Fixed versions
- 5.006+ds-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": "libsereal-decoder-perl",
"purl": "pkg:deb/debian/libsereal-decoder-perl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"5.003+ds-1",
"5.004+ds-1",
"5.006+ds-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-8796.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libsereal-decoder-perl",
"purl": "pkg:deb/debian/libsereal-decoder-perl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"5.004+ds-1",
"5.006+ds-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-8796.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "5.006+ds-1"
}
]
}
],
"package": {
"name": "libsereal-decoder-perl",
"purl": "pkg:deb/debian/libsereal-decoder-perl?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"5.004+ds-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-8796.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58544 · Revision 1
- Added to Heist Feed
- Publisher date