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No exploitation reportedFix availableAwaiting NVD analysis

CVE-2026-124077

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

No exploitation reported by the sources we read.

  • Published2026-11-09
  • WeaknessCWE-158

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-11-0920:10CVE publishedCNA

Versions per branch

Products declared by the CNA2 products

As apache, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Apache Software Foundation Apache Commons Codecother versions: not affected

    package commons-codec:commons-codechttps://repo.maven.apache.org/maven2

    Affected
    • ≥ 1.22.0, < 1.23.0fixed in 1.23.0maven
  • Apache Software Foundation Apache Commons Codecother versions: not affected

    https://gitbox.apache.org/repos/asf/commons-codec.git

    Affected
    • ≥ 387120c901f4a75c3112dfdf8877dcdec7ae685d, < 87f6aa2818836998528ff4b0d1ea35545a800ee5fixed in 87f6aa2818836998528ff4b0d1ea35545a800ee5git

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-09

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • apache-commons-codecopenSUSE:Tumbleweedall versions · fixed in 1.23.0-1.1

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Published
2026-11-09
Last Modified
2026-11-12
NVD status
Awaiting Analysis
GitHub Advisory
GHSA-26mf-gqw6-894w

Frequently asked questions

What is CVE-2026-124077?

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.

Is CVE-2026-124077 actively exploited?

Active exploitation of CVE-2026-124077 has not been confirmed. Its EPSS score was 0.2% on 2026-11-11, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-124077?

CVE-2026-124077 has a CVSS v3 base score of 4.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.

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