CVE-2026-22184

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.41% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 35.2% of scored records. A rank, not a probability.

NVD base score

4.6 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Modified. NVD last modified this record on 2026-09-01.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-01-07 20:25Z9 MO AGO

Last updated

2026-09-01 12:04Z1 MO AGO

Reserved

2026-01-06

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Medium (CVSS 4.6)

CNA CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

Weaknesses

• CWE-787Out-of-bounds WriteBase
• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')Base

Data version

5.2

Document digest

bb2494de3a5bc6ef534aa69abf8b1c2efd4919abe177df6452c76251992e3bfb

• seclists.orghttps://seclists.org/fulldisclosure/2026/Jan/3technical-descriptionexploit
• zlib.nethttps://zlib.net/product
• github.comhttps://github.com/madler/zlibproduct
• www.vulncheck.comhttps://www.vulncheck.com/advisories/zlib-untgz-global-buffer-overflow-in-tgzfnamethird-party-advisory
• github.comhttps://github.com/madler/zlib/issues/1142
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-22184vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2427688https://bugzilla.redhat.com/show_bug.cgi?id=2427688issue-trackingx_refsource_REDHAT
• security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22184.jsonx_sadp-csaf-vex
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-470355.html