CVE-2023-34366: A use-after-free vulnerability exists in the Figure stream parsing functionality of Ichitaro 2023 1.0.1.59372

This month

HIGH 7.8MITIGATEMITIGATEMITIGATE

CVE-2023-34366 is a high-severity flaw (CVSS 7.8) affecting easy postcard max, ichitaro 2021, ichitaro 2022. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A use-after-free vulnerability exists in the Figure stream parsing functionality of Ichitaro 2023 1.0.1.59372. A specially crafted document can cause memory corruption, resulting in arbitrary code execution. Victim would need to open a malicious file to trigger this vulnerability.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-416
Published	2023-10-19
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: justsystems

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-10-19 18:15 UTCPublished CVE record published
2026-06-17 06:03 UTCUpdated Record last modified

justsystems easy postcard max MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy easy-postcard-max || rpm -q easy-postcard-max || easy-postcard-max --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

justsystems ichitaro 2021 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ichitaro-2021 || rpm -q ichitaro-2021 || ichitaro-2021 --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

justsystems ichitaro 2022 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ichitaro-2022 || rpm -q ichitaro-2022 || ichitaro-2022 --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

justsystems ichitaro 2023 DOWNGRADE

Affected: 1.0.1.59372

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.1.59372

1. Check installed version

apt-cache policy ichitaro-2023 || rpm -q ichitaro-2023 || ichitaro-2023 --version

2. No fixed release: DOWNGRADE to a release before 1.0.1.59372 (Debian / Ubuntu)

apt-cache madison ichitaro-2023 sudo apt install ichitaro-2023=<VERSION_BEFORE_1.0.1.59372> sudo apt-mark hold ichitaro-2023

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ichitaro-2023 sudo dnf downgrade ichitaro-2023-<VERSION_BEFORE_1.0.1.59372> sudo dnf versionlock add ichitaro-2023

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

justsystems ichitaro government 10 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ichitaro-government-10 || rpm -q ichitaro-government-10 || ichitaro-government-10 --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

justsystems ichitaro government 8 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ichitaro-government-8 || rpm -q ichitaro-government-8 || ichitaro-government-8 --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-34366?

easy postcard max: mitigate or apply the listed mitigation; ichitaro 2021: mitigate or apply the listed mitigation; ichitaro 2022: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-34366 being exploited?

CVE-2023-34366 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-34366 affect?

CVE-2023-34366 affects easy postcard max, ichitaro 2021, ichitaro 2022. Severity is high (CVSS 7.8). A use-after-free vulnerability exists in the Figure stream parsing functionality of Ichitaro 2023 1.0.1.59372. A specially crafted document can cause memory corruption, resulting in arbitrary code execution. Victim would need to open a mali

How urgent is CVE-2023-34366?

Priority 45/100. High severity; Public exploit reference

Related CVEs

CVE-2023-38128 HIGH 7.8 MITIGATE MITIGATE An out-of-bounds write vulnerability exists in the "HyperLinkFrame" stream parser of Ichitaro 2023 1.0.1.59372
CVE-2023-38127 HIGH 7.8 MITIGATE MITIGATE An integer overflow exists in the "HyperLinkFrame" stream parser of Ichitaro 2023 1.0.1.59372
CVE-2023-35126 HIGH 7.8 MITIGATE MITIGATE An out-of-bounds write vulnerability exists within the parsers for both the "DocumentViewStyles" and "Document

References

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