DEBIAN-CVE-2026-4115
A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verify of the file crypto/ecc-ssh.c of the component Ed25519 Signature Handler. The manipulation results in improper verification of cryptographic signature. The attack may be performed from remote. The attack requires a high level of complexity. The exploitability is told to be difficult. The exploit is now public and may be used. The real existence of this vulnerability is still doubted at the moment. The patch is identified as af996b5ec27ab79bae3882071b9d6acf16044549. It is advisable to implement a patch to correct this issue. The vendor was contacted early, responded in a very professional manner and quickly released a patch for the affected product. However, at the moment there is no proof that this flaw might have any real-world impact.
DEBIAN-CVE-2026-4115
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-2026-4115
putty
Source reference: /affected/0/package/name
- Affected versions
- 0.78-2
Source reference:
/affected/0/versions0.78-2+deb12u1Source reference:
/affected/0/versions0.78-2+deb12u2Source reference:
/affected/0/versions0.78-3Source reference:
/affected/0/versions0.79-1Source reference:
/affected/0/versions0.80-1Source reference:
/affected/0/versions0.81-1Source reference:
/affected/0/versions0.81-2Source reference:
/affected/0/versions0.81-3Source reference:
/affected/0/versions0.82-1Source reference:
/affected/0/versions0.82-2Source reference:
/affected/0/versions0.83-1Source reference:
/affected/0/versions0.83-2Source reference:
/affected/0/versions0.83-3Source reference:
/affected/0/versions0.84-1Source reference:
/affected/0/versions0.85-3Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
putty
Source reference: /affected/1/package/name
- Affected versions
- 0.83-3
Source reference:
/affected/1/versions0.84-1Source reference:
/affected/1/versions0.85-3Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
putty
Source reference: /affected/2/package/name
- Affected versions
- 0.83-3
Source reference:
/affected/2/versions - Fixed versions
- 0.84-1
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": "putty",
"purl": "pkg:deb/debian/putty?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"0.78-2",
"0.78-2+deb12u1",
"0.78-2+deb12u2",
"0.78-3",
"0.79-1",
"0.80-1",
"0.81-1",
"0.81-2",
"0.81-3",
"0.82-1",
"0.82-2",
"0.83-1",
"0.83-2",
"0.83-3",
"0.84-1",
"0.85-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-4115.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "putty",
"purl": "pkg:deb/debian/putty?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"0.83-3",
"0.84-1",
"0.85-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-4115.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.84-1"
}
]
}
],
"package": {
"name": "putty",
"purl": "pkg:deb/debian/putty?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"0.83-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-4115.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57603 · Revision 1
- Added to Heist Feed
- Publisher date