CVE-2026-53585

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Source
https://cve.org/CVERecord?id=CVE-2026-53585
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53585.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-53585
Aliases
  • GHSA-27m5-gxxh-x79j
Downstream
Related
Published
2026-08-20T18:37:44.115Z
Modified
2026-08-22T09:15:52.184938Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
libgit2: Unbounded Memory Allocation via Delta Object Result-Size Header
Details

libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, gitdeltaapply in src/libgit2/delta.c trusts the attacker-controlled ressz value parsed by hdrsz from a delta object header and passes that amount to git_malloc before validating delta instructions. Malicious pack data supplied through gitclone, gitfetch, gitremotefetch, gitindexerappend, or a local attacker-supplied repository can use a very small multi-level OFSDELTA chain to retain extremely large allocations and exhaust memory. This issue is fixed in versions 1.8.6 and 1.9.5.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53585.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-770"
    ]
}
References

Affected packages

Git / github.com/libgit2/libgit2

Affected ranges

Type
GIT
Repo
https://github.com/libgit2/libgit2
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Introduced
338e6fb681369ff0537719095e22ce9dc602dbf0
Fixed
5853918c4c6a7b12f8becf4bd11ff4362ebb9020
Fixed
f7a4071c766ceea3915415e22134cbe3e581c420
Fixed
0cdfdd5fa8f8514c82413025e1e0808866cf7c30
Fixed
c1896f06df22cc0ca5658df3a8f6cd7ede4cd6ae
Fixed
dec22ac01ad9620c96b7b9ac3ef636ea46d43bed
Database specific
Show details 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.8.6"
        },
        {
            "introduced": "1.9.0"
        },
        {
            "fixed": "1.9.5"
        }
    ]
}

Affected versions

v0.*
v0.1.0
v0.10.0
v0.11.0
v0.12.0
v0.13.0
v0.14.0
v0.15.0
v0.16.0
v0.17.0
v0.18.0
v0.2.0
v0.21.0
v0.22.0
v0.22.0-rc1
v0.22.0-rc2
v0.23.0
v0.23.0-rc1
v0.23.0-rc2
v0.24.0
v0.24.0-rc1
v0.26.0
v0.26.0-rc1
v0.26.0-rc2
v0.27.0
v0.27.0-rc1
v0.27.0-rc2
v0.27.0-rc3
v0.28.0
v0.28.0-rc1
v0.3.0
v0.8.0
v0.99.0
v1.*
v1.0.0
v1.1.0
v1.2.0
v1.3.0
v1.4.0
v1.5.0
v1.6.1
v1.6.2
v1.6.3
v1.7.0
v1.8.0
v1.8.1
v1.8.3
v1.8.4
v1.8.5
v1.9.0
v1.9.1
v1.9.2
v1.9.3
v1.9.4

Database specific

vanir_signatures_modified 
"2026-08-22T09:15:52Z"
vanir_signatures 
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source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53585.json"