Search threats, CVEs… ⌘K
Back to vendor advisories
Microsoft Security Response CenterCVE-2026-27820

zlib: Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption

Mariner

Read the vendor bulletin Get alerts for azl3 zlib 1.3.2-1 on Azure Linux
LowCVSS not listedLow severity
Scope

What the vendor says is affected

  • azl3 zlib 1.3.2-1 on Azure Linux 3.0
  • azl3 ruby 3.3.5-7 on Azure Linux 3.0

Versions the vendor lists as fixed

  • 3.3.5-8
Next step

What the vendor recommends

CBL-Mariner Releases

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-27820View CVSS, KEV, EPSS, and threat context
Keep investigating
See every advisory from this vendor