Bundesamt für Sicherheit in der Informationstechnik Debian · zlib: Schwachstelle ermöglicht Denial of Service und Integritätsverlust
Affects Bundesamt für Sicherheit in der Informationstechnik DebianSource GCVE Database
Not known to be exploited.
Data as of 9 Nov 2026, 13:47 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 2 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.
What to do
AI-suggested
Apply the official security updates provided by Ubuntu for the zlib packages as listed in the advisory USN-8954-1. A standard system update will install the necessary fixes. No additional mitigation steps are required beyond applying these updates.
Description
A vulnerability in the zlib compression library allows specially crafted input to trigger a heap buffer overflow. This flaw can lead to denial of service or arbitrary code execution. The issue arises from incorrect handling of certain non-blocking write operations. Fixed package versions have been released for multiple Ubuntu releases.
References
- wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3153.json (opens in a new tab)
- wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-3153 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-85091 (opens in a new tab)
- gist.github.com/thesmartshadow/e0b9481792afb7c31e86fee1ff084490 (opens in a new tab)
- vulncheck.com/advisories/zlib-1.3.1.2-through-1.3.2-heap-buffer-overflow-via-gz-vacate (opens in a new tab)
- api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Sep (opens in a new tab)
- ibm.com/support/pages/node/7292224 (opens in a new tab)
- ubuntu.com/security/notices/USN-8954-1 (opens in a new tab)
- lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/O263XYD7DT3P6Y5SUOBT353IRBWDBLG3/ (opens in a new tab)
- lists.debian.org/debian-security-announce/2026/msg00532.html (opens in a new tab)