CVE-2026-105768 (GCVE-0-2026-105768)
Vulnerability from cvelistv5 – Published: 2026-10-05 20:17 – Updated: 2026-10-06 13:59
VLAI
EPSS
VEX
Title
apko /etc/passwd and /etc/group UID/GID truncation writes package-supplied entries as root
Summary
apko allows users to build and publish OCI container images built from apk packages. From version 0.2.0 to before version 1.4.5, UserEntry.Parse and GroupEntry.Parse in pkg/passwd read the UID and GID fields of /etc/passwd and /etc/group entries with strconv.Atoi and convert them to uint32 without a range check. On 64-bit platforms an out-of-range value such as 4294967296 (2^32) is truncated to 0, and negative values wrap. Because apko parses the passwd and group entries supplied by the packages it installs and writes them back into the image, an attacker who controls a package installed into the image can ship an entry that appears to declare an unprivileged UID or GID but is written into the built image as UID 0 or GID 0 (root). The truncated UID is also used when resolving the image's run-as user. This issue has been fixed in version 1.4.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 13:59 UTC
CWE
- CWE-197 - Numeric Truncation Error
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/chainguard-dev/apko/security/a… | vendor-advisory |
| https://github.com/chainguard-dev/apko/pull/2516 | patch |
| https://github.com/chainguard-dev/apko/commit/739… | patch |
| https://github.com/chainguard-dev/apko/releases/t… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| chainguard-dev | apko |
Affected:
0.2.0 , < 1.4.5
(semver)
|
guessed |
Date Public
2026-09-23 22:40
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"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-197",
"description": "CWE-197 Numeric Truncation Error",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-05T20:17:46.477Z",
"orgId": "82cea9a6-e9e3-46fe-bdb0-3673de380178",
"shortName": "chainguard"
},
"references": [
{
"name": "GHSA-rj6x-hwpv-vhvf",
"tags": [
"vendor-advisory"
],
"url": "https://github.com/chainguard-dev/apko/security/advisories/GHSA-rj6x-hwpv-vhvf"
},
{
"name": "chainguard-dev/apko#2516",
"tags": [
"patch"
],
"url": "https://github.com/chainguard-dev/apko/pull/2516"
},
{
"name": "Fix commit 739e7ce",
"tags": [
"patch"
],
"url": "https://github.com/chainguard-dev/apko/commit/739e7ce3f675ffb232e16849b51ff93657f1570c"
},
{
"name": "apko v1.4.5",
"tags": [
"release-notes"
],
"url": "https://github.com/chainguard-dev/apko/releases/tag/v1.4.5"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eUpgrade to apko 1.4.5 or later, which rejects UID and GID values outside 0 to 4294967295 instead of truncating them. Images built with earlier versions from untrusted packages should be rebuilt.\u003c/p\u003e"
}
],
"value": "Upgrade to apko 1.4.5 or later, which rejects UID and GID values outside 0 to 4294967295 instead of truncating them. Images built with earlier versions from untrusted packages should be rebuilt."
}
],
"source": {
"advisory": "GHSA-rj6x-hwpv-vhvf",
"discovery": "EXTERNAL"
},
"timeline": [
{
"lang": "en",
"time": "2022-03-03T23:21:00.000Z",
"value": "Truncating uint32 conversion introduced"
},
{
"lang": "en",
"time": "2026-09-21T22:49:00.000Z",
"value": "Fix merged (chainguard-dev/apko#2516)"
},
{
"lang": "en",
"time": "2026-09-23T22:40:00.000Z",
"value": "GHSA-rj6x-hwpv-vhvf published"
},
{
"lang": "en",
"time": "2026-09-28T00:51:00.000Z",
"value": "apko v1.4.5 released"
}
],
"title": "apko /etc/passwd and /etc/group UID/GID truncation writes package-supplied entries as root",
"x_generator": {
"engine": "Vulnogram 1.0.5"
}
}
},
"cveMetadata": {
"assignerOrgId": "82cea9a6-e9e3-46fe-bdb0-3673de380178",
"assignerShortName": "chainguard",
"cveId": "CVE-2026-105768",
"datePublished": "2026-10-05T20:17:46.477Z",
"dateReserved": "2026-10-05T19:21:04.930Z",
"dateUpdated": "2026-10-06T13:59:32.353Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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