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NVD / CVE Program· CNA GitHub_M

CVE-2026-33056: tar-rs: unpack_in can chmod arbitrary directories by following symlinks

Noroxi assessment

Priority: Monitor (action score 20/100)

  • 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: 0.39% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No special conditions are required; it is repeatable.
  • Fixed version: alexcrichton tar-rs 0.4.45; azl3 clamav 1.5.2-1 on Azure Linux 3.0 1.5.2-2; azl3 clamav 1.5.2-2 on Azure Linux 3.0 1.5.2-2.

Low priority for now. Upgrade to alexcrichton tar-rs 0.4.45; azl3 clamav 1.5.2-1 on Azure Linux 3.0 1.5.2-2; azl3 clamav 1.5.2-2 on Azure Linux 3.0 1.5.2-2 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

tar-rs is a tar archive reading/writing library for Rust. In versions 0.4.44 and below, when unpacking a tar archive, the tar crate's unpack_dir function uses fs::metadata() to check whether a path that already exists is a directory. Because fs::metadata() follows symbolic links, a crafted tarball containing a symlink entry followed by a directory entry with the same name causes the crate to treat the symlink target as a valid existing directory — and subsequently apply chmod to it. This allows an attacker to modify the permissions of arbitrary directories outside the extraction root. This issue has been fixed in version 0.4.45.

MediumCVSS 5.1 · v4.0—No exploit Fix available
Published
Mar 20, 2026
Updated
Jun 17, 2026
EPSS
0.3% · 33th percentile

Report tools

JSON

Action score

20

Monitor

Low priority for now.

CVSS
20 / 40 · 5.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
5.1
NVD has not scored this yet; the score shown is the CNA’s.

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

Follow CVE-2026-33056

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.

VendorProduct
tar projecttar

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • tar project tarbefore 0.4.45

Versions reported by the vendor

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

  • alexcrichton tar-rs

    • < 0.4.45affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Alpine:v3.20rustbefore 1.78.0-r11.78.0-r1
Alpine:v3.21rustbefore 1.83.0-r11.83.0-r1
Alpine:v3.22rustbefore 1.87.0-r11.87.0-r1
Alpine:v3.23rustbefore 1.91.1-r11.91.1-r1
Alpine:v3.24chromium-rustbefore 1.94.0-r11.94.0-r1
Alpine:v3.24rustbefore 1.94.0-r11.94.0-r1
crates.iotarfrom 0.0.0-0 · before 0.4.450.4.45
crates.iotarbefore 0.4.450.4.45
Debian:12rust-tarfrom 0—
Debian:12rustcfrom 0—
Debian:13rustcbefore 1.85.1+dfsg1-1+deb13u11.85.1+dfsg1-1+deb13u1
Debian:14rust-tarbefore 0.4.45-10.4.45-1
Debian:14rustcbefore 1.92.0+dfsg1-21.92.0+dfsg1-2

Same product

tar project: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-32804Arbitrary File Creation/Overwrite due to insufficient absolute path sanitization
    37Monitor
  • CVE-2021-32803Arbitrary File Creation/Overwrite via insufficient symlink protection due to directory cache poisoning
    34Monitor
  • CVE-2018-20990An issue was discovered in the tar crate before 0.4.16 for Rust.
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2021-38511Aug 10, 2021 · An issue was discovered in the tar crate before 0.4.36 for Rust.
    30Monitor

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
alexcrichton tar-rs0.4.45 · descriptionVendor (CNA)
azl3 clamav 1.5.2-1 on Azure Linux 3.01.5.2-2 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 clamav 1.5.2-2 on Azure Linux 3.01.5.2-2 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 rpm-ostree 2024.4-10 on Azure Linux 3.02024.4-10 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 rpm-ostree 2024.4-8 on Azure Linux 3.02024.4-10 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 rust 1.75.0-27 on Azure Linux 3.01.75.0-28 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 rust 1.90.0-6 on Azure Linux 3.01.90.0-7 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 trident 0.21.0-1 on Azure Linux 3.00.22.0-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 rpm-ostree 2022.1-8 on CBL Mariner 2.02022.1-9 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 rpm-ostree 2022.1-8 on CBL-Mariner 2.02022.1-9 · Release NotesMicrosoft (MSRC)
cbl2 rust 1.72.0-15 on CBL Mariner 2.01.72.0-16 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 rust 1.72.0-15 on CBL-Mariner 2.01.72.0-16 · Release NotesMicrosoft (MSRC)
alpine:chromium-rust1.94.0-r1 · Alpine:v3.24Package registry (OSV)
alpine:rust1.78.0-r1 · Alpine:v3.20Package registry (OSV)
crates.io:tar0.4.45Package registry (OSV)
debian:rust-tar0.4.45-1 · Debian:14Package registry (OSV)
debian:rustc1.85.1+dfsg1-1+deb13u1 · Debian:13Package registry (OSV)

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.

No history yet (it accumulates with the daily EPSS job).

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.

No credits in the CNA record.

Variant candidates

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

No nightly-computed relations.

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 special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-61 · UNIX Symbolic Link (Symlink) Following

CVSS vector

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

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

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

All records