Skip to main content

Boteraser | Website and Server Security Solutions

🛡️ JLSEC-2026-1212 — curl-jll (CVE-2026-8458)

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

Description

libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate...

libcurl might in some circumstances reuse the wrong connection when asked to

do Negotiate-authenticated ones, even when they are set to use different

'services'.

libcurl features a pool of recent connections so that subsequent requests can

reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical

error in the code, a request that was issued by an application could

wrongfully reuse an existing connection to the same server that was

authenticated using different services.

How this vulnerability can be exploited

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

CVSS metrics in full

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

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: None.

Affected software

JLSEC-2026-1212 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:L/PR:L/UI:N/S:U/C:N/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

Free Vulnerability Check

Is your site affected by JLSEC-2026-1212?

BotEraser helps you identify potentially vulnerable plugins and themes by checking your installation against JLSEC-2026-1212 and other known CVE records.

Scan My Site Free →

No credit card required  ·  Results in minutes

ⓘ 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.

Browse related advisories

All advisoriesJlsecJlsec 2026
✓