7.5

CVE-2018-20834: isaacs tar

Modified
AliasesDEBIAN-CVE-2018-20834GHSA-j44m-qm6p-hp7m
Published 30-04-2019Last modified 05-08-2024

Vulnerability summary

CVE-2018-20834 is a high (CVSS 7.5) vulnerability in isaacs tar. EPSS estimates a 3.15% chance of exploitation in the next 30 days, higher than 87.9% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (reference, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.0 (NVD)
EPSS score
3.15%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 1
RHSA-2019:1821

Timeline

  1. 30-04-2019
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

A vulnerability was found in node-tar before version 4.4.2 (excluding version 2.2.2). An Arbitrary File Overwrite issue exists when extracting a tarball containing a hardlink to a file that already exists on the system, in conjunction with a later plain file with the same name as the hardlink. This plain file content replaces the existing file content. A patch has been applied to node-tar v2.2.2).

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

3.15%

Chance of exploitation in the next 30 days

Percentile

88%

Versus all other CVEs

30-day change

No change 0.00 pp

From 3.15% on 05-10-2026

05-10-202604-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (hackerone.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian1 product
  • node-tar< 4.4.4+ds1-2
Isaacs1 product
  • tar< 2.2.2 | ≥ 3.0.0, < 4.4.2
Npm1 product
  • tar≥ 3.0.0, < 4.4.2 | < 2.2.2

3 vendors · 3 products

References

9 links