CVE-2025-5222: A stack buffer overflow was found in Internationl components for unicode (ICU )

Q: How do I fix CVE-2025-5222?

international components for unicode: upgrade to 77.1. Exact commands for each OS are on this page.

Q: Is CVE-2025-5222 being exploited?

CVE-2025-5222 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-5222 affect?

CVE-2025-5222 affects international components for unicode. Severity is high (CVSS 7.0). A stack buffer overflow was found in Internationl components for unicode (ICU ). While running the genrb binary, the 'subtag' struct overflowed at the SRBRoot::addTag function. This issue may lead to memory corruption and local arbitrary co

Routine

HIGH 7.0UPGRADE

CVE-2025-5222 is a high-severity flaw (CVSS 7.0) affecting international components for unicode. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A stack buffer overflow was found in Internationl components for unicode (ICU ). While running the genrb binary, the 'subtag' struct overflowed at the SRBRoot::addTag function. This issue may lead to memory corruption and local arbitrary code execution.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.0 (High)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-120
Published	2025-05-27
Last modified	2026-10-21

Publisher (CNA): Red Hat, Inc. · Vendor: unicode

Last updated 2026-10-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-27 21:15 UTCPublished CVE record published
2026-10-21 21:17 UTCUpdated Record last modified

unicode international components for unicode UPGRADE

Affected: < 77.1

Fixed in: 77.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy international-components-for-unicode || rpm -q international-components-for-unicode || international-components-for-unicode --version

2. UPGRADE to 77.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade international-components-for-unicode

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade international-components-for-unicode

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2025-5222?

international components for unicode: upgrade to 77.1. Exact commands for each OS are on this page.

Is CVE-2025-5222 being exploited?

CVE-2025-5222 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-2025-5222 affect?

CVE-2025-5222 affects international components for unicode. Severity is high (CVSS 7.0). A stack buffer overflow was found in Internationl components for unicode (ICU ). While running the genrb binary, the 'subtag' struct overflowed at the SRBRoot::addTag function. This issue may lead to memory corruption and local arbitrary co

How urgent is CVE-2025-5222?

Priority 34/100. High severity

References

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