libssh global known_hosts override
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
- Jan 8, 2026
- Updated
- Sep 15, 2026
- EPSS
- 0.5% · 43th percentile
- CWE
- CWE-297
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Report tools
Action score
21
Monitor
Low priority for now.
- CVSS
- 21 / 40 · 5.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| haxx | curl | cpe:2.3:a:haxx:curl |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- haxx curl7.58.0 and later · before 8.18.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (curl). Independent of NVD's CPE analysis and usually ahead of it.
curl curl
- 8.17.0, 8.16.0, 8.15.0, 8.14.1, 8.14.0, 8.13.0, 8.12.1, 8.12.0, 8.11.1, 8.11.0, 8.10.1, 8.10.0 … (+24)affected
- 7.58.0 and later · before 8.14.2affected · semver
- 8.15.0 and later · before 8.16.1affected · semver
- 8.17.0 and later · before 8.18.0affected · semver
- c92d2e14cfb0db662f958effd2ac86f995cf1b5a and later · before adca486c125d9a6d9565b9607a19dce803a8b479affected · git
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.24 | curl | from 7.58.0 · before 0 | 0 |
| Debian:12 | curl | all versions | — |
| Debian:14 | curl | before 8.18.0~rc3-1 | 8.18.0~rc3-1 |
| openSUSE:Leap 15.6 | curl | before 8.14.1-150600.4.34.1 | 8.14.1-150600.4.34.1 |
| openSUSE:Leap 16.0 | curl | before 8.14.1-160000.4.1 | 8.14.1-160000.4.1 |
| openSUSE:Tumbleweed | curl | before 8.18.0-1.1 | 8.18.0-1.1 |
| Red Hat:hummingbird:1 | curl | before 0:8.19.0-3.hum1 | 0:8.19.0-3.hum1 |
| SUSE:Linux Enterprise Micro 5.2 | curl | before 8.14.1-150200.4.97.1 | 8.14.1-150200.4.97.1 |
| SUSE:Linux Enterprise Micro 5.3 | curl | before 8.14.1-150400.5.77.1 | 8.14.1-150400.5.77.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | curl | before 8.14.1-150700.7.8.1 | 8.14.1-150700.7.8.1 |
| SUSE:Linux Enterprise Server 16.0 | curl | before 8.14.1-160000.4.1 | 8.14.1-160000.4.1 |
| SUSE:Linux Enterprise Server 16.0 | curl-mini | before 8.14.1-160000.4.1 | 8.14.1-160000.4.1 |
| SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | curl | before 8.0.1-11.111.1 | 8.0.1-11.111.1 |
| SUSE:Linux Micro 6.0 | curl | before 8.14.1-3.1 | 8.14.1-3.1 |
| SUSE:Linux Micro 6.1 | curl | before 8.14.1-slfo.1.1_4.1 | 8.14.1-slfo.1.1_4.1 |
Same product
haxx: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-22901curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session t50Plan
- CVE-2023-38039When curl retrieves an HTTP response, it stores the incoming headers so that
they can be accessed later via the libcurl headers API.47Plan
- CVE-2024-2398HTTP/2 push headers memory-leak45Plan
- CVE-2019-5482Heap buffer overflow in the TFTP protocol handler in cURL 7.19.4 to 7.65.3.44Plan
- CVE-2017-8817The FTP wildcard function in curl and libcurl before 7.57.0 allows remote attackers to cause a denial of service (out-of-bounds read and app42Plan
- CVE-2017-8816The NTLM authentication feature in curl and libcurl before 7.57.0 on 32-bit platforms allows attackers to cause a denial of service (integer42Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| curl curl | 8.14.2 | Vendor (CNA) |
| curl curl | 8.16.1 | Vendor (CNA) |
| curl curl | 8.18.0 | Vendor (CNA) |
| curl curl | adca486c125d9a6d9565b9607a19dce803a8b479 | Vendor (CNA) |
| alpine:curl | 0 · Alpine:v3.24 | Package registry (OSV) |
| debian:curl | 8.18.0~rc3-1 · Debian:14 | Package registry (OSV) |
| opensuse:curl | 8.14.1-150600.4.34.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| red hat:curl | 0:8.19.0-3.hum1 · Red Hat:hummingbird:1 | Package registry (OSV) |
| suse:curl | 8.14.1-150200.4.97.1 · SUSE:Linux Enterprise Micro 5.2 | Package registry (OSV) |
| suse:curl-mini | 8.14.1-160000.4.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Harry Sintonenfinder
- Daniel Stenbergremediation developer
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2026-12064176 days apartproto-default skips SSH verification30Monitor
- CVE-2026-9547176 days apartSSH improper host validation29Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-297 · Improper Validation of Certificate with Host MismatchCVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- curl.se/docs/CVE-2025-15079.html
- curl.se/docs/CVE-2025-15079.json
- www.openwall.com/lists/oss-security/2026/01/07/6
Vendor advisories and official records. Exploit/PoC links are deliberately left out.