CVE-2026-25934Network attack vector

Integrity loss via unchecked pack and index checksums

Published Feb 9, 2026 · Updated Feb 9, 2026

Improper integrity validation in go-git before 5.16.5 allows remote attackers to make clients consume corrupted Git pack data. Pack scanning did not verify trailer checksums, index decoding did not verify index checksums, and filesystem storage did not ensure that an index referenced the target pack hash. A user or application must fetch and process attacker-altered data; the documented result is repository-integrity loss and errors such as missing objects, not code execution.

CVSS severity4.3
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper integrity validation in go-git before 5.16.5 allows remote attackers to make clients consume corrupted Git pack data. Pack scanning did not verify trailer checksums, index decoding did not verify index checksums, and filesystem storage did not ensure that an index referenced the target pack hash. A user or application must fetch and process attacker-altered data; the documented result is repository-integrity loss and errors such as missing objects, not code execution.

The record

CVE
CVE-2026-25934
Published
Feb 9, 2026
Updated
Feb 9, 2026
Vendor
go-git
Product
go-git
Classifications
CWE-354
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 5.16.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

go-git · go-gitversion=< 5.16.5

Published CVSS scores

4.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
4.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-354Improper Validation of Integrity Check Value

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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