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  4. CVE 2026 124077 apache commons codec nul bytes in tree entry
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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-124077

Apache Commons Codec: NUL bytes in tree entry names cause Git/SWHID identifier collisions (GitIdentifiers class)CVE-2026-124077

Answer in brief

CVE-2026-124077 records a Unknown severity vulnerability in Apache Commons Codec: NUL bytes in tree entry names cause Git/SWHID identifier collisions (GitIdentifiers class). The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/Apache Commons Codec (generic), Apache Software Foundation/commons-codec:commons-codec (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 9, 2026Updated Nov 9, 2026Source checked Nov 9, 2026First seen by HOL Nov 9, 2026Material review Nov 9, 2026
Upstream Advisory

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/Apache Commons Codec (generic), Apache Software Foundation/commons-codec:commons-codec (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Apache Software Foundation/Apache Commons Codecgeneric>=387120c901f4a75c3112dfdf8877dcdec7ae685d <87f6aa2818836998528ff4b0d1ea35545a800ee587f6aa2818836998528ff4b0d1ea35545a800ee5
Apache Software Foundation/commons-codec:commons-codecgeneric>=1.22.0 <1.23.01.23.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/Apache Commons Codec, Apache Software Foundation/commons-codec:commons-codec.
  2. 2Review the reported fix. Update Apache Software Foundation/Apache Commons Codec to 87f6aa2818836998528ff4b0d1ea35545a800ee5; Apache Software Foundation/commons-codec:commons-codec to 1.23.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 9, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencelists.apache.org
Upstream source description

The GitIdentifiers class in Apache Commons Codec did not reject NUL bytes in tree entry names. Because Git uses a NUL byte to mark the end of each entry name in a tree object, a crafted name could make one tree serialize to the same bytes as a different tree. Two different directory trees could then receive the same Git tree identifier or SWHID. The impact is limited: common file systems do not allow NUL bytes in file names, so trees built by walking a file system are not affected. Only applications that build trees from names supplied by other sources, such as entries of archive formats that permit NUL bytes in names (e.g. ZIP) or names passed directly to the API, are exposed. This issue affects Apache Commons Codec: from 1.22.0 before 1.23.0. Users are recommended to upgrade to version 1.23.0, which fixes the issue.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Apache Commons Codec: Blake3 doFinalize is stateless; the documented KDF example derives identical keysSame apache software foundation/commons-codec package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-158
Source
CVE List V5
Source checked
Nov 9, 2026
References
2 linked sources
Open source record