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NVD / CVE Program· CNA PSF

CVE-2026-19672: tarfile extraction filter bypass allows creation of directories outside the destination

Noroxi assessment

Priority: Monitor (action score 25/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.47% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Python Software Foundation CPython 3.16.0; azl3 python3 3.12.14-1 on Azure Linux 3.0 3.12.14-2; azl3 python3 3.12.14-2 on Azure Linux 3.0 3.12.14-2.

Low priority for now. Upgrade to Python Software Foundation CPython 3.16.0; azl3 python3 3.12.14-1 on Azure Linux 3.0 3.12.14-2; azl3 python3 3.12.14-2 on Azure Linux 3.0 3.12.14-2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

The tarfile module's tar and data extraction filters created directories outside the destination for members whose name leaves the destination and returns to it, such as ../evil/../dest/sub/file. The containment check used the resolved path, but intermediate directories were created from the name as given. Only empty directories are created outside the destination. Member contents are still extracted inside it. To return to the destination the member's name must contain the destination directory's own final component, so extraction into a secure randomised directory is not affected. This affects POSIX platforms only. On Windows, .. components are collapsed before the path reaches the filesystem, so the directories outside the destination are never created.

MediumCVSS 6.3 · v4.0—No exploit Fix available
Published
Aug 19, 2026
Updated
Aug 28, 2026
EPSS
0.4% · 40th percentile

Report tools

JSON

Action score

25

Monitor

Low priority for now.

CVSS
25 / 40 · 6.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · PSF
6.3
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (PSF). Independent of NVD's CPE analysis and usually ahead of it.

  • Python Software Foundation CPython

    • before 3.16.0affected · python

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.21python3before 3.12.15-r03.12.15-r0
Alpine:v3.24python3before 3.14.8-r03.14.8-r0
Debian:13python3.13from 0—
Debian:14python3.14before 3.14.7-33.14.7-3
Debian:14python3.15before 3.15.0~rc2-13.15.0~rc2-1
openSUSE:Tumbleweedpython310before 3.10.21-2.13.10.21-2.1
openSUSE:Tumbleweedpython311before 3.11.16-2.13.11.16-2.1
openSUSE:Tumbleweedpython312before 3.12.14-2.13.12.14-2.1
openSUSE:Tumbleweedpython313before 3.13.15-1.13.13.15-1.1
openSUSE:Tumbleweedpython314before 3.14.7-2.13.14.7-2.1
openSUSE:Tumbleweedpython315before 3.15.0~rc2-1.13.15.0~rc2-1.1
Red Hat:hummingbird:1python-unversioned-commandbefore 0:3.14.7-1.1.hum10:3.14.7-1.1.hum1
Red Hat:hummingbird:1python3before 0:3.14.7-1.1.hum10:3.14.7-1.1.hum1
Red Hat:hummingbird:1python3-debugbefore 0:3.14.7-1.1.hum10:3.14.7-1.1.hum1
Red Hat:hummingbird:1python3-develbefore 0:3.14.7-1.1.hum10:3.14.7-1.1.hum1
Red Hat:hummingbird:1python3-idlebefore 0:3.14.7-1.1.hum10:3.14.7-1.1.hum1
Red Hat:hummingbird:1python3-libsbefore 0:3.14.7-1.1.hum10:3.14.7-1.1.hum1
Red Hat:hummingbird:1python3-testbefore 0:3.14.7-1.1.hum10:3.14.7-1.1.hum1
Red Hat:hummingbird:1python3-tkinterbefore 0:3.14.7-1.1.hum10:3.14.7-1.1.hum1
Red Hat:hummingbird:1python3.10before 0:3.10.21-1.1.hum10:3.10.21-1.1.hum1
Red Hat:hummingbird:1python3.10-debugbefore 0:3.10.21-1.1.hum10:3.10.21-1.1.hum1
Red Hat:hummingbird:1python3.10-develbefore 0:3.10.21-1.1.hum10:3.10.21-1.1.hum1
Red Hat:hummingbird:1python3.10-idlebefore 0:3.10.21-1.1.hum10:3.10.21-1.1.hum1
Red Hat:hummingbird:1python3.10-libsbefore 0:3.10.21-1.1.hum10:3.10.21-1.1.hum1

+60

Same product

python software foundation: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-115557Distrust compromised intermediate certificates in ssl module
    37Monitor
  • CVE-2025-4517Arbitrary writes via tarfile realpath overflow
    37Monitor
  • CVE-2026-19445Use-after-free of a server-side SSLContext when sni_callback switches contexts
    36Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-17084Aug 18, 2026 · stringprep.map_table_b2() deviates from RFC 3454 Table B.2
    24Monitor
  • ← EarlierCVE-2026-15806Aug 18, 2026 · `HTTPPasswordMgr` can send saved HTTPS credentials via HTTP because of incorrect scheme matching
    24Monitor
  • Later →CVE-2026-15310Aug 25, 2026 · zipfile: bzip2/LZMA/Zstandard members decompress without a max_length bound, defeating chunked-read memory limits
    8Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Python Software Foundation CPython3.16.0Vendor (CNA)
azl3 python3 3.12.14-1 on Azure Linux 3.03.12.14-2Microsoft (MSRC)
azl3 python3 3.12.14-2 on Azure Linux 3.03.12.14-2 · Release NotesMicrosoft (MSRC)
alpine:python33.12.15-r0 · Alpine:v3.21Package registry (OSV)
debian:python3.143.14.7-3 · Debian:14Package registry (OSV)
debian:python3.153.15.0~rc2-1 · Debian:14Package registry (OSV)
opensuse:python3103.10.21-2.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:python3113.11.16-2.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:python3123.12.14-2.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:python3133.13.15-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:python3143.14.7-2.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:python3153.15.0~rc2-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:python-unversioned-command0:3.14.7-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python30:3.14.7-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3-debug0:3.14.7-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3-devel0:3.14.7-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3-idle0:3.14.7-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3-libs0:3.14.7-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3-test0:3.14.7-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3-tkinter0:3.14.7-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3.140:3.14.7-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3.14-freethreading0:3.14.7-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3.14-freethreading-debug0:3.14.7-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3.14-freethreading-devel0:3.14.7-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
suse:python2.7.18-150000.133.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP7Package registry (OSV)
suse:python-base2.7.18-150000.133.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP7Package registry (OSV)
suse:python-doc2.7.18-33.88.1 · SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5Package registry (OSV)
suse:python3103.10.22-150400.4.129.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:python310-core3.10.22-150400.4.129.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:python3113.11.16-150400.9.102.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP4Package registry (OSV)

+8

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-4517442 days apartArbitrary writes via tarfile realpath overflow
    37Monitor
  • CVE-2026-1194057 days aparttarfile extraction filter bypass allows escaping the destination directory
    31Monitor
  • CVE-2025-4138442 days apartBypassing extraction filter to create symlinks to arbitrary targets outside extraction directory
    30Monitor
  • CVE-2025-4330442 days apartExtraction filter bypass for linking outside extraction directory
    30Monitor
  • CVE-2026-777476 days aparttarfile.data_filter path traversal bypass allows writing outside the extraction directory
    27Monitor
  • CVE-2026-8791023 days aparttarfile hardlink fallback ignores custom extraction filter rejection via None
    22Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

The bug in code

The whole CWE-22 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
const file = path.join(ROOT, req.query.name);res.sendFile(file);

Fixed

ts
const file = path.resolve(ROOT, req.query.name);if (!file.startsWith(ROOT + path.sep)) {  return res.sendStatus(400);}res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records