CVE-2025-15079 | libssh global known_hosts override

Exp

When doing SSH-based transfers using either SCP or SFTP, and setting the known_hosts file, libcurl could still mistakenly accept connecting to hosts *not present* in the specified file if they were added as recognized in the libssh *global* known_hosts file.

Published: 2026-01-08 Last update: 2026-01-20 Assigner: 2499f714-1537-4658-8207-48ae4bb9eae9 Source: 2499f714-1537-4658-8207-48ae4bb9eae9
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-15079 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.02%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2025-15079

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2025-15079

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-01-08 — 0.02% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-15079

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.6 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-15079

OS Trackers for CVE-2025-15079

vendor priority summary link
alpine — CVE-2025-15079: 1 source package rows (curl); 279 state rows across 6 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, 3.23-main, edge-main); fixed 67, open 212. https://security.alpinelinux.org/vuln/CVE-2025-15079
debian unimportant CVE-2025-15079 unimportant priority: Debian including 1 source packages (curl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 3, resolved 2. https://security-tracker.debian.org/tracker/CVE-2025-15079
redhat low — https://access.redhat.com/security/cve/CVE-2025-15079
suse medium CVE-2025-15079 severity moderate: SUSE including 339 source package names (1.1.0-1.7:libcurl4-8.14.1-150700.7.8.1, 13.2-9.56:curl-8.14.1-slfo.1.1_4.1, …), 816 product×package rows across 245 product lines (Container private-registry/harbor-trivy-adapter, Container suse/ltss/sle12.5/sles12sp5, … (245 product lines)): Fixed 573, Known Affected 231, First Fixed 6, Known Not Affected 6. https://www.suse.com/security/cve/CVE-2025-15079/
ubuntu low CVE-2025-15079 low priority: Ubuntu including 1 source packages (curl), 9 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): released 5, not-affected 4. https://ubuntu.com/security/CVE-2025-15079

Affected software / configurations for CVE-2025-15079

Vendor Product Version Raw CPE
haxx curl >= 7.58.0, < 8.18.0 cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

References for CVE-2025-15079

URL Tags
https://curl.se/docs/CVE-2025-15079.html Vendor Advisory Patch
https://curl.se/docs/CVE-2025-15079.json Vendor Advisory
https://hackerone.com/reports/3477116 Exploit Issue Tracking Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/01/07/6 Mailing List Third Party Advisory Patch
cvelogic Threat Intelligence