CVE-2026-86412High· 8.1▾ MidnightPoC available

server-set cookie erases cookie jar

A remote HTTP server can set a cookie that curl accepts and writes to a Netscape cookie jar but cannot reload. On the next invocation using the same path for `--cookie` and `--cookie-jar`, curl fails before connecting, then the cleanup p…

▾ Midnight zone — Critical, or high with PoC / in-the-wild

Depth score57/ 100 · Moderate

impact 44.6 · likelihood 0.2 · exploitation 12

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Proof of concept

A public proof-of-concept already exists for this vulnerability — see Exploit availability below.

…

Published

Oct 20, 2026

Updated

Oct 29, 2026

CVSS

8.1

Vendor

curl

Product

curl

CWE

CWE-754

Depth score

57 · Moderate

EPSS

0.83% · p58

Platforms

—

Source

CVEORG

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

decided 2026-10-29

Exploitation: poc
Automatable: no
Technical impact: total

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the CISA ADP record, not NVD.

EPSS history

Exploit-prediction probability, daily snapshots since Oct 22.

0.3% → 0.8%▲ 0.5%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

7 events · 13 days

Oct 20, 2026Published
Disclosed via CVEORG
Oct 22, 2026EPSS first tracked
0.3%
Oct 29, 2026Record revised
Last analysed / modified upstream
Oct 30, 2026EPSS peak
0.3% → 0.8%
Nov 1, 2026Public exploit observed
Exploit / PoC code exists
Nov 1, 2026CVSS changed
— → 8.1
Nov 1, 2026Severity changed
none → high

curl CWE-754 #cve.org #exploit-available

Affected

curl >= 8.22.0 <= 8.22.0
curl >= 8.21.0 <= 8.21.0
curl >= 8.20.0 <= 8.20.0
curl >= 8.19.0 <= 8.19.0
curl >= 8.18.0 <= 8.18.0

Full technical detail▾

Overview

A remote HTTP server can set a cookie that curl accepts and writes to a Netscape cookie jar but cannot reload. On the next invocation using the same path for --cookie and --cookie-jar, curl fails before connecting, then the cleanup procedure replaces the jar with an empty file, deleting cookies for unrelated domains.

Affected

curl >= 8.22.0 <= 8.22.0
curl >= 8.21.0 <= 8.21.0
curl >= 8.20.0 <= 8.20.0
curl >= 8.19.0 <= 8.19.0
curl >= 8.18.0 <= 8.18.0

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Change history

Field changes observed since this record was first indexed.

Nov 1, 2026Public exploit / PoC published
Nov 1, 2026CVSS — → 8.1
Nov 1, 2026Severity none → high

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#cve.org#exploit-available

server-set cookie erases cookie jar

▾ Midnight zone — Critical, or high with PoC / in-the-wild

Depth score57/ 100 · Moderate

impact 44.6 · likelihood 0.2 · exploitation 12

Overview