CVE-2017-18258: xmlsoft libxml2
Vulnerability summary
CVE-2017-18258 is a medium (CVSS 6.5) vulnerability in xmlsoft libxml2. EPSS estimates a 2.73% chance of exploitation in the next 30 days, higher than 86.1% of scored vulnerabilities.
Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 5 · Related 2Timeline
- 08-04-2018PublishedVulnerability first disclosed.
- 14-10-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · RubygemsEcosystem advisory · calculated6.5MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS trend
Probability
2.73%
Chance of exploitation in the next 30 days
Percentile
86%
Versus all other CVEs
30-day change
Increase +0.07 pp
From 2.66% on 05-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.
Debian1 product
- libxml2< 2.9.10+dfsg-2
RubyGems1 product
- nokogiri< 1.8.2
Ubuntu1 product
- libxml2< 2.9.1+dfsg1-3ubuntu4.13 | < 2.9.3+dfsg1-1ubuntu0.6 | < 2.9.4+dfsg1-6.1ubuntu1.2
Xmlsoft1 product
- libxml2< 2.9.6
4 vendors · 4 products
References
16 links
- git.gnome.org/browse/libxml2/commit/?id=e2a9122b8dde53d320750451e9907a7dcb2ca8bbX Refsource MISCPatchVendor AdvisoryWEB
- security.netapp.com/advisory/ntap-20190719-0001/X Refsource CONFIRM
