Home/CVE/The xz_head function in xzlib.c in libxml2 before 2.9.6 allows remote attackers to cause a denial of service (memory con
CVE

CVE-2017-18258

The xz_head function in xzlib.c in libxml2 before 2.9.6 allows remote attackers to cause a denial of service (memory con

The xz_head function in xzlib.c in libxml2 before 2.9.6 allows remote attackers to cause a denial of service (memory consumption) via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is required for a legitimate file.

MEDIUM · CVSS 6.5 EPSS 0.00898
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-770Allocation of Resources Without Limits or Throttling
▤

Affected Products & Versions

1
xmlsoft libxml2< 2.9.6
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
RubyGems nokogiri MODERATE fixed in 1.8.2
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.0 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Apr 2018 · 05:29 PM
CVSS VectorCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

8
siemens-csafSSA-398330
rhsaRHBA-2020:1540Moderate
rhsaRHBA-2020:1539Important
suse-csafSUSE-SU-2018:3081-1
usnUSN-3739-1
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://git.gnome.org/browse/libxml2/commit/?id=e2a9122b8dde53d320750451e9907a7dcb2ca8bbPatchVendor Advisory
https://kc.mcafee.com/corporate/index?page=content&id=SB10284
https://lists.debian.org/debian-lts-announce/2018/09/msg00035.html
https://lists.debian.org/debian-lts-announce/2020/09/msg00009.html
https://security.netapp.com/advisory/ntap-20190719-0001/
https://usn.ubuntu.com/3739-1/
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