How severe is GHSA-jh5x-hfhg-78jq?

GHSA-jh5x-hfhg-78jq has a CVSS score of 7.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by GHSA-jh5x-hfhg-78jq?

GHSA-jh5x-hfhg-78jq affects the following packages: pear/archive_tar (Packagist). Ecosystems affected: Packagist.

How do I fix GHSA-jh5x-hfhg-78jq?

Update pear/archive_tar to version 1.4.11 or later. Run your dependency manager's update command and verify no transitive dependencies pin the vulnerable version. Use O3 Security's SCA scanner to confirm the fix is applied across your entire dependency tree.

Is GHSA-jh5x-hfhg-78jq actively exploited in the wild?

Yes. There are 5 known exploit references for GHSA-jh5x-hfhg-78jq, including 3 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for GHSA-jh5x-hfhg-78jq?

GHSA-jh5x-hfhg-78jq has an EPSS (Exploit Prediction Scoring System) score of 76.9%, placing it in the 99th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is GHSA-jh5x-hfhg-78jq?

GHSA-jh5x-hfhg-78jq is classified as Deserialization of Untrusted Data (CWE-502). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was GHSA-jh5x-hfhg-78jq published, and has it been updated?

GHSA-jh5x-hfhg-78jq was published on April 22, 2021 and was last updated on December 10, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘 Packagist

GHSA-jh5x-hfhg-78jq

HIGH

Deserialization of Untrusted Data in Archive_Tar

Also known asBIT-drupal-2020-28948BIT-drupal-2020-28949CVE-2020-28948 CVE-2020-28949DRUPAL-CORE-2020-013GHSA-75c5-f4gw-38r9

Published

Apr 22, 2021

Updated

Dec 10, 2025

Affected

1 pkg

Patched

1 / 1

Exploits

5 known

EPSS Exploitation Probability

via FIRST.org ↗

76.9%probability of exploitation in next 30 days

Very High Risk99th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

1 pkg affected

🐘pear/archive_tar

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Archive_Tar through 1.4.10 allows an unserialization attack because phar: is blocked but PHAR: is not blocked. See: https://github.com/pear/Archive_Tar/issues/33

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`pear/archive_tar`	all versions	1.4.11

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Archive_Tar through 1.4.10 allows an unserialization attack because phar…

github.comNVDFeb 2021

Archive_Tar through 1.4.10 allows an unserialization attack because phar…

github.comAwesomePocJun 2020

Archive_Tar through 1.4.10 allows an unserialization attack because phar…

github.comGithubNov 2020

Frequently Asked Questions

Archive_Tar through 1.4.10 allows an unserialization attack because `phar:` is blocked but `PHAR:` is not blocked. See: https://github.com/pear/Archive_Tar/issues/33

O3 Security · Impact-Aware SCA

Is GHSA-jh5x-hfhg-78jq in your stack?

O3 detects GHSA-jh5x-hfhg-78jq across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works

CVSS Score

7.8/10

CVSS v3 base score

Vector breakdown

AV:Attack Vector

Local

AC:Attack Complexity

Low

PR:Privileges Required

None

UI:User Interaction