How severe is CVE-2026-22184?

CVE-2026-22184 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-22184 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-22184?

CVE-2026-22184 affects Zlib. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-22184?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-22184 have an EU (EUVD) identifier?

Yes. CVE-2026-22184 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1173.

When was CVE-2026-22184 published?

CVE-2026-22184 was published on 2026-01-07 and last updated on 2026-06-30.

CVE-2026-22184

CVE-2026-22184 is a high-severity vulnerability in Zlib with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v4: 4.6
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-1173
Weakness: CWE-787
Affected product: Zlib
Published: 2026-01-07
Last modified: 2026-06-30

Description

zlib versions up to and including 1.3.1.2 include a global buffer overflow in the untgz utility located under contrib/untgz. The vulnerability is limited to the standalone demonstration utility and does not affect the core zlib compression library. The flaw occurs when a user executes the untgz command with an excessively long archive name supplied via the command line, leading to an out-of-bounds write in a fixed-size global buffer.

Frequently asked questions

What is CVE-2026-22184?: zlib versions up to and including 1.3.1.2 include a global buffer overflow in the untgz utility located under contrib/untgz. The vulnerability is limited to the standalone demonstration utility and does not affect the core zlib compression library. The flaw occurs when a user executes the untgz command with an excessively long archive name supplied via the command line, leading to an out-of-bounds write in a fixed-size global buffer.
How severe is CVE-2026-22184?: CVE-2026-22184 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-22184 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-22184?: CVE-2026-22184 affects Zlib. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-22184?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-22184 have an EU (EUVD) identifier?: Yes. CVE-2026-22184 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1173.
When was CVE-2026-22184 published?: CVE-2026-22184 was published on 2026-01-07 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:zlib:zlib:*:*:*:*:*:*:*:*

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