CVE-2026-22184: zlib <= 1.3.1.2 untgz Global Buffer Overflow in TGZfname()
CSIRTS triage
- What
- A global buffer overflow exists in the TGZfname() function when processing untgz operations.
- Who is affected
- Applications using zlib versions 1.3.1.2 and earlier that process gzip tar archives.
- Urgency
- Critical; CVSS 9.8 indicates severe exploitability and potential remote code execution if untrusted archives are processed.
- Action
- Upgrade zlib immediately to the latest patched version.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch zlib
Get an email when a new zlib advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-22184
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-221840.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-22184 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- criticalexploitedSiemens CADRAcisa
- unknownNCSC-2026-0229 [1.00] [M/H] Vulnerabilities fixed in Siemens productsncsc-nl
More from Microsoft Security Response Center
- lowCVE-2026-14673: PostgreSQL amcheck does not clear untrusted search path2026-08-11
- criticalCVE-2026-69836: Microsoft Entra ID Remote Code Execution Vulnerability2026-08-11
- mediumCVE-2026-53792: rsync < 3.5.0 Out-of-Bounds Read via Zero-Length Checksum Block2026-08-11
- highCVE-2026-70347: Windows Installer Elevation of Privilege Vulnerability2026-08-11
- highCVE-2026-64909: Microsoft Office Remote Code Execution Vulnerability2026-08-11