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Fencer Vulns
medium 5.5

CVE-2021-29136 json

Improper input validation in umoci

published 2021-04-06 5 y ago modified 2026-07-08 4 mo ago also GHSA-9m95-8hx6-7p9v , GO-2022-0815 , EUVD-2022-0942

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/opencontainers/umoci 0.4.7
  • linuxfoundation umoci 0.4.7
  • sylabs singularity 3.7.3
  • umoci Debian 14, Debian 13, Debian 12 0.4.7+ds-1

debian advisories DEBIAN-CVE-2021-29136

  • umoci SLES 15 SP1-BCL, SLE Module for Containers 15 SP3, SLE Module for Containers 15 SP2 +9 more 0.4.7-3.12.1
  • umoci SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +7 more 0.4.6-3.9.1

suse advisories SUSE-SU-2021:1863-2SUSE-SU-2021:1863-1SUSE-SU-2021:1116-1

  • singularity openSUSE Tumbleweed 3.8.3-1.2
  • umoci openSUSE Tumbleweed 0.4.7-2.3
  • umoci openSUSE Leap 15.3 0.4.7-3.12.1
  • umoci openSUSE Leap 15.2 0.4.7-lp152.2.6.1
  • singularity Package Hub 15 SP2 3.7.3-bp152.2.19.3
  • umoci openSUSE Leap 15.2 0.4.6-lp152.2.3.1

opensuse advisories openSUSE-SU-2024:11384-1openSUSE-SU-2024:11482-1openSUSE-SU-2021:1863-1openSUSE-SU-2021:0846-1openSUSE-SU-2021:0810-1openSUSE-SU-2021:0548-1

  • umoci Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 0.4.7-r0
  • singularity Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 3.7.3-r0

alpine advisories ALPINE-CVE-2021-29136

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-29136 updated cvss 5.5

singularity: allows overwriting of host files

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:P/A:N
GitHub 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/opencontainers/umoci
<0.4.7
0.4.7

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.