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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-124077
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-09 20:18:10 UTC
Updated2026-11-10 01:17:17 UTC
DescriptionThe 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.

Risk And Classification

Problem Types: CWE-158 | CWE-158 CWE-158 Improper neutralization of null byte or NUL character

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Commons Codec affected 1.22.0 1.23.0 maven Not specified
CNA Apache Software Foundation Apache Commons Codec affected 387120c901f4a75c3112dfdf8877dcdec7ae685d 87f6aa2818836998528ff4b0d1ea35545a800ee5 git Not specified

References

ReferenceSourceLinkTags
github.com/apache/commons-codec/commit/87f6aa2818836998528ff4b0d1ea35545... [email protected] github.com
lists.apache.org/thread.html/zns7tbnkq685prps9d85q7ct6oobvzsm [email protected] lists.apache.org
www.openwall.com/lists/oss-security/2026/11/09/30 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Claude Security (en)

CNA: Gary D. Gregory (en)

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