CVE-2026-24486 | Python-Multipart has Arbitrary File Write via Non-Default Configuration

Exp

Python-Multipart is a streaming multipart parser for Python. Prior to version 0.0.22, a Path Traversal vulnerability exists when using non-default configuration options `UPLOAD_DIR` and `UPLOAD_KEEP_FILENAME=True`. An attacker can write uploaded files to arbitrary locations on the filesystem by crafting a malicious filename. Users should upgrade to version 0.0.22 to receive a patch or, as a workaround, avoid using `UPLOAD_KEEP_FILENAME=True` in project configurations.

Published: 2026-01-27 Last update: 2026-02-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-24486 is rated High Exploit Risk (77.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.96%). 2 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-2026-24486

EDB-ID Source Kind Published Link
52543 exploit_db edb 2026-04-30 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-24486

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 2026-05-01 0.02% 0.96% +0.94%
2 2026-01-27 — 0.02% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-24486

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.6 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L 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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 4.7 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N 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:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2026-24486

GitHub Security Advisory for CVE-2026-24486

GHSA-wp53-j4wj-2cfg · Severity: high · Ecosystem: pip — Python-Multipart has Arbitrary File Write via Non-Default Configuration

OS Trackers for CVE-2026-24486

vendor priority summary link
alpine — CVE-2026-24486: 1 source package rows (py3-python-multipart); 4 state rows across 2 repos (3.23-community, edge-community); fixed 0, open 4. https://security.alpinelinux.org/vuln/CVE-2026-24486
debian not yet assigned CVE-2026-24486 not yet assigned priority: Debian including 1 source packages (python-multipart), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. https://security-tracker.debian.org/tracker/CVE-2026-24486
redhat high — https://access.redhat.com/security/cve/CVE-2026-24486
suse high CVE-2026-24486 severity important: SUSE including 7 source package names (cloud-regionsrv-client-10.3.11-3.1, cloud-regionsrv-client-plugin-azure-2.0.0-3.1, …), 29 product×package rows across 12 product lines (Image SLE-Micro, Image SLE-Micro-Azure, … (12 product lines)): Fixed 28, First Fixed 1. https://www.suse.com/security/cve/CVE-2026-24486/
ubuntu medium CVE-2026-24486 medium priority: Ubuntu including 1 source packages (python-multipart), 4 status rows across 4 suites (jammy, noble, questing, upstream): released 3, needed 1. https://ubuntu.com/security/CVE-2026-24486

Affected software / configurations for CVE-2026-24486

Vendor Product Version Raw CPE
fastapiexpert python-multipart < 0.0.22 cpe:2.3:a:fastapiexpert:python-multipart:*:*:*:*:*:python:*:*

References for CVE-2026-24486

cvelogic Threat Intelligence