DEBIAN-CVE-2026-5958
When sed is invoked with both -i (in-place edit) and --follow-symlinks, the function open_next_file() performs two separate, non-atomic filesystem operations on the same path: 1. resolves symlink to its target and stores the resolved path for determining when output is written, 2. opens the original symlink path (not the resolved one) to read the file. Between these two calls there is a race window. If an attacker atomically replaces the symlink with a different target during that window, sed will: read content from the new (attacker-chosen) symlink target and write the processed result to the path recorded in step 1. This can lead to arbitrary file overwrite with attacker-controlled content in the context of the sed process. This issue was fixed in version 4.10.
DEBIAN-CVE-2026-5958
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-2026-5958
sed
Source reference: /affected/0/package/name
- Affected versions
- 4.9-1
Source reference:
/affected/0/versions - Fixed versions
- 4.9-1+deb12u1
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
sed
Source reference: /affected/1/package/name
- Affected versions
- 4.9-2
Source reference:
/affected/1/versions - Fixed versions
- 4.9-2+deb13u1
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
sed
Source reference: /affected/2/package/name
- Affected versions
- 4.9-2
Source reference:
/affected/2/versions - Fixed versions
- 4.9-3
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"
},
{
"fixed": "4.9-1+deb12u1"
}
]
}
],
"package": {
"name": "sed",
"purl": "pkg:deb/debian/sed?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"4.9-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5958.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.9-2+deb13u1"
}
]
}
],
"package": {
"name": "sed",
"purl": "pkg:deb/debian/sed?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"4.9-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5958.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.9-3"
}
]
}
],
"package": {
"name": "sed",
"purl": "pkg:deb/debian/sed?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"4.9-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5958.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56046 · Revision 1
- Added to Heist Feed
- Publisher date