A flaw was found in dmg2img through 20170502.

published 2021-05-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26859

cvss: 7.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits: 0; none known

A flaw was found in dmg2img through 20170502. dmg2img did not validate the size of the read buffer during memcpy() inside the main() function. This possibly leads to memory layout information leaking in the data. This might be used in a chain of vulnerability in order to reach code execution.

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-2021-3548 updated 2026-03-27 cvss 4.3

dmg2img: OOB in dmg2img.c memcpy() causing undefined behavior

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

0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.1	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
NVD	2.0	5.8	AV:N/AC:M/Au:N/C:P/I:N/A:P

Affected products

n/a dmg2img

Classification

Weakness

CWE-125 Out-of-bounds Read

References

bugzilla.redhat.com /show_bug.cgi?id=1959585
issue-tracking, third-party-advisory

Sources

CVE List CVE-2021-3548
NVD CVE-2021-3548

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.

Summary