CVE-2025-9086 | Out of bounds read for cookie path

Exp

1. A cookie is set using the `secure` keyword for `https://target` 2. curl is redirected to or otherwise made to speak with `http://target` (same hostname, but using clear text HTTP) using the same cookie set 3. The same cookie name is set - but with just a slash as path (`path=\"/\",`). Since this site is not secure, the cookie *should* just be ignored. 4. A bug in the path comparison logic makes curl read outside a heap buffer boundary The bug either causes a crash or it potentially makes the comparison come to the wrong conclusion and lets the clear-text site override the contents of the secure cookie, contrary to expectations and depending on the memory contents immediately following the single-byte allocation that holds the path. The presumed and correct behavior would be to plainly ignore the second set of the cookie since it was already set as secure on a secure host so overriding it on an insecure host should not be okay.

Published: 2025-09-12 Last update: 2026-06-02 Assigner: 2499f714-1537-4658-8207-48ae4bb9eae9 Source: 2499f714-1537-4658-8207-48ae4bb9eae9
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-9086 is rated High Exploit Risk (65.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.36%). 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-2025-9086

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

Exploit prediction scoring system (EPSS) score for CVE-2025-9086

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 2026-06-08 0.27% 0.36% +0.09%
2 2026-06-03 0.06% 0.27% +0.21%
3 2026-05-23 — 0.06% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-9086

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 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:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-9086

GitHub Security Advisory for CVE-2025-9086

GHSA-v676-f8gm-92r9 · Severity: high — 1. A cookie is set using the `secure` keyword for `https://target` 2. curl is redirected to or...

OS Trackers for CVE-2025-9086

vendor priority summary link
alpine — CVE-2025-9086: 1 source package rows (curl); 274 state rows across 5 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 5, open 269. https://security.alpinelinux.org/vuln/CVE-2025-9086
debian unimportant CVE-2025-9086 unimportant priority: Debian including 1 source packages (curl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2025-9086
redhat medium — https://access.redhat.com/security/cve/CVE-2025-9086
suse high CVE-2025-9086 severity important: SUSE including 348 source package names (0.0.17-1.1:curl-8.14.1-150600.4.28.1, 0.0.17-1.1:libcurl4-8.14.1-150600.4.28.1, …), 997 product×package rows across 337 product lines (Container bci/spack, Container containers/lmcache-lmstack-router, … (337 product lines)): Fixed 746, Known Affected 226, Known Not Affected 17, First Fixed 8. https://www.suse.com/security/cve/CVE-2025-9086/
ubuntu low CVE-2025-9086 low priority: Ubuntu including 1 source packages (curl), 9 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): not-affected 6, released 2, ignored 1. https://ubuntu.com/security/CVE-2025-9086

Affected software / configurations for CVE-2025-9086

Vendor Product Version Raw CPE
haxx curl >= 8.13.0, < 8.16.0 cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
debian debian_linux 11.0 cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

References for CVE-2025-9086

cvelogic Threat Intelligence