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🛡️ JLSEC-2026-1222 — curl-jll (CVE-2026-9547)

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

When a libcurl-based application performs transfers via SCP:// or SFTP:// and utilizes the ...

When a libcurl-based application performs transfers via SCP:// or SFTP://

and utilizes the CURLOPT_SSH_KEYFUNCTION callback, it may silently accept an

untrusted server. This vulnerability occurs when a server presents a host key

type that does not match the specific key type already recorded for that host

in the known_hosts file. Instead of rejecting the mismatch, the callback

mechanism fails to properly enforce the restriction, allowing the connection

to succeed without warning and risking a potential man-in-the-middle attack.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: None.

Affected software

JLSEC-2026-1222 is recorded against 2 packages.

  • curl-jll
  • libcurl-jll

Timeline and source

Published on 7 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

curl.se (Web)
curl.se (Web)
github.com (Web)
hackerone.com (Web)
nvd.nist.gov (Web)

Other advisories for this package

curl-jll has other advisories on record. If you are patching this one, these are worth checking on the same host:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-08-07
Updated 2026-08-20
Modified 2026-08-07
Fix URL N/A

Affected Packages

Software From version Fixed in
curl-jll — —
libcurl-jll — —

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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