← Vulnerability feed

Vulnerability record · CVE-2021-29136 · published 6 April 2021

CVE-2021-29136: Linuxfoundation umoci improper input validation vulnerability

Linuxfoundation · Umoci

Open Container Initiative umoci before 0.4.7 allows attackers to overwrite arbitrary host paths via a crafted image that causes symlink traversal when "umoci unpack" or "umoci raw unpack" is used.

5.5 CVSS 3.1 Medium EPSS 0.34% · top 73.6% CWE-20 · Improper input validation
5.5CVSS 3.1 base score, v2 2.1
0.34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Open Container Initiative umoci before 0.4.7 allows attackers to overwrite arbitrary host paths via a crafted image that causes symlink traversal when "umoci unpack" or "umoci raw unpack" is used.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2021/04/06/2 Mailing ListPatchThird Party Advisory
https://github.com/opencontainers/umoci/commit/d9efc31daf2206f7d3fdb839863cf7a576a2eb57 PatchThird Party Advisory
https://github.com/opencontainers/umoci/security/advisories/GHSA-9m95-8hx6-7p9v Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/06/2 Mailing ListPatchThird Party Advisory
https://github.com/opencontainers/umoci/commit/d9efc31daf2206f7d3fdb839863cf7a576a2eb57 PatchThird Party Advisory
https://github.com/opencontainers/umoci/security/advisories/GHSA-9m95-8hx6-7p9v Third Party Advisory

Track CVE-2021-29136 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-33027Sylabs singularity vulnerabilitySylabs Singularity Enterprise through 1.6.2 has Insufficient Entropy in a nonce.EPSS 1.3%9.8CVE-2021-33622Sylabs singularity vulnerabilitySylabs Singularity 3.5.x and 3.6.x, and SingularityPRO before 3.5-8, has an Incorrect Check of a Function's Return Value.EPSS 1.3%9.3CVE-2020-15229Sylabs singularity path traversal vulnerabilitySingularity (an open source container platform) from version 3.1.1 through 3.6.3 has a vulnerability. Due to insecure handling of path traversal and …EPSS 2.0%8.8CVE-2020-25040Sylabs singularity exposure of resource to wrong sphere vulnerabilitySylabs Singularity through 3.6.2 has Insecure Permissions on temporary directories used in explicit and implicit container build operations, a differ…EPSS 2.0%8.8CVE-2019-11328Sylabs singularity incorrect permission assignment vulnerabilityAn issue was discovered in Singularity 3.1.0 to 3.2.0-rc2, a malicious user with local/network access to the host system (e.g. ssh) could exploit thi…EPSS 2.1%8.1CVE-2020-25039Sylabs singularity exposure of resource to wrong sphere vulnerabilitySylabs Singularity 3.2.0 through 3.6.2 has Insecure Permissions on temporary directories used in fakeroot or user namespace container execution.EPSS 2.0%7.8CVE-2023-30549Lfprojects apptainer use after free vulnerabilityApptainer is an open source container platform for Linux. There is an ext4 use-after-free flaw that is exploitable through versions of Apptainer < 1.…EPSS 0.37%7.8CVE-2018-19295Sylabs singularity improper input validation vulnerabilitySylabs Singularity 2.4 to 2.6 allows local users to conduct Improper Input Validation attacks.EPSS 0.47%

Source: NIST National Vulnerability Database (record CVE-2021-29136), CISA KEV, FIRST EPSS (scores of 2026-10-19). This page is refreshed as NVD updates the record.