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CRITICAL severity

MITM based Zip Slip in `org.hl7.fhir.publisher:org.hl7.fhir.publisher`GHSA-xr8x-pxm6-prjg

CRITICAL

GHSA-xr8x-pxm6-prjg is a critical-severity (CVSS 9.1) Path Traversal vulnerability in org.hl7.fhir.publisher:org.hl7.fhir.publisher. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for org.hl7.fhir.publisher:org.hl7.fhir.publisher — see the affected versions and patch details below.

Also known asCVE-2023-24057GHSA-jqh6-9574-5x22
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
  • A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA’s SSVC triage for GHSA-xr8x-pxm6-prjg.

EPSS Exploitation Probability

via FIRST.org ↗
1.2%probability of exploitation in next 30 days
Lower Risk+0.01%
Lower risk than most CVEs68th percentile — riskier than 68% of all scored CVEsHighest risk
0.19%0.68%1.18%1.68%0.7%1.2%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
☕org.hl7.fhir.publisher:org.hl7.fhir.publisher

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

Description

Impact

MITM can enable Zip-Slip.

Vulnerability

Vulnerability 1: Publisher.java

There is no validation that the zip file being unpacked has entries that are not maliciously writing outside of the intended destination directory.

https://github.com/HL7/fhir-ig-publisher/blob/87313e92de6dd6cea816449e0edd225e054a7891/org.hl7.fhir.publisher.core/src/main/java/org/hl7/fhir/igtools/publisher/Publisher.java#L3598-L3610

Vulnerability 2: WebSourceProvider.java

There is a check for malicious zip entries here, but it is not covered by test cases and could potentially be reverted in future changes.

https://github.com/HL7/fhir-ig-publisher/blob/87313e92de6dd6cea816449e0edd225e054a7891/org.hl7.fhir.publisher.core/src/main/java/org/hl7/fhir/igtools/web/WebSourceProvider.java#L104-L112

Vulnerability 3: ZipFetcher.java

This retains the path for Zip files in FetchedFile entries, which could later be used to output malicious entries to another compressed file or file system.

https://github.com/HL7/fhir-ig-publisher/blob/87313e92de6dd6cea816449e0edd225e054a7891/org.hl7.fhir.publisher.core/src/main/java/org/hl7/fhir/igtools/publisher/ZipFetcher.java#L57-L106

Vulnerability 4: IGPack2NpmConvertor.java

The loadZip method retains the path for entries in the zip file, which could later be used to output malicious entries to another compressed file or file system.

https://github.com/HL7/fhir-ig-publisher/blob/87313e92de6dd6cea816449e0edd225e054a7891/org.hl7.fhir.publisher.core/src/main/java/org/hl7/fhir/igtools/publisher/IGPack2NpmConvertor.java#L442-L463

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.hl7.fhir.publisher:org.hl7.fhir.publisherall versions1.2.30org.hl7.fhir.publisher:org.hl7.fhir.publisher:1.2.30

Affected Products

2 products · 2 configurations
Application
hl7 fhir corehapifhir
< 5.6.92
range
Application
fhir ig publisherhl7
< 1.2.30
range
Exploits & PoCs
1

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

HL7 (Health Level 7) FHIR Core Libraries before 5.6.92 allow attackers t…

github.comNVDFeb 2023

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.hl7.fhir.publisher:org.hl7.fhir.publisher, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.hl7.fhir.publisher:org.hl7.fhir.publisher to 1.2.30 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xr8x-pxm6-prjg is resolved across your whole dependency graph.

  3. Workarounds

    Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.

Frequently Asked Questions

### Impact MITM can enable Zip-Slip. ### Vulnerability #### Vulnerability 1: `Publisher.java` There is no validation that the zip file being unpacked has entries that are not maliciously writing outside of the intended destination directory. https://github.com/HL7/fhir-ig-publisher/blob/87313e92de6dd6cea816449e0edd225e054a7891/org.hl7.fhir.publisher.core/src/main/java/org/hl7/fhir/igtools/publisher/Publisher.java#L3598-L3610 #### Vulnerability 2: `WebSourceProvider.java` There is a check for malicious zip entries here, but it is not covered by test cases and could potentially be reverted
O3 Security · Impact-Aware SCA

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MITM based Zip Slip in `org.hl7.fhir.publisher:org.hl7.fhir.p…