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[USN-8582-1] jbig2dec vulnerabilities

Posted on 21 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8582-1
July 21, 2026

jbig2dec vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in jbig2dec.

Software Description:
- jbig2dec: JBIG2 decoder library

Details:

Zeng Yunxiang and Song Jiaxuan discovered that jbig2dec had an
out-of-bounds read vulnerability in its command-line tool. An attacker
could possibly use this issue to cause jbig2dec to crash, resulting in a
denial of service. This issue only affected Ubuntu 22.04 LTS.
(CVE-2023-46361)

It was discovered that jbig2dec had an integer overflow in the
jbig2_arith_iaid_ctx_new() function. An attacker could possibly use this
issue to cause a denial of service. (CVE-2026-38076)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
jbig2dec 0.20-1ubuntu0.26.04.1
libjbig2dec0 0.20-1ubuntu0.26.04.1

Ubuntu 24.04 LTS
jbig2dec 0.20-1ubuntu0.24.04.1
libjbig2dec0 0.20-1ubuntu0.24.04.1

Ubuntu 22.04 LTS
jbig2dec 0.19-3ubuntu0.1
libjbig2dec0 0.19-3ubuntu0.1

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8582-1
CVE-2023-46361, CVE-2026-38076

Package Information:
https://launchpad.net/ubuntu/+source/jbig2dec/0.20-1ubuntu0.26.04.1
https://launchpad.net/ubuntu/+source/jbig2dec/0.20-1ubuntu0.24.04.1
https://launchpad.net/ubuntu/+source/jbig2dec/0.19-3ubuntu0.1

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