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Vulnerabilities

Vulnerability · 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 consumption) via a crafted LZMA file, because the decoder funct

Published Apr 8, 2018 · catalog updated Oct 14, 2026 · The xz_head function in

Check if you run it

No confirmed exploitation is on record for CVE-2017-18258. EPSS is 2.74%. Act only if a listed version of The xz_head function in is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (The xz_head function in).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.74%
Remediation
Advisory link
Affected products
Debian:12 libxml2 · Debian:13 libxml2 · Debian:14 libxml2 · cpe xmlsoft/libxml2

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 libxml20 → 2.9.10+dfsg-2
  • Debian:13 libxml20 → 2.9.10+dfsg-2
  • Debian:14 libxml20 → 2.9.10+dfsg-2
  • cpe xmlsoft/libxml2version unspecified

How to fix CVE-2017-18258

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2017-18258. EPSS is 2.74%. Act only if a listed version of The xz_head function in is installed.

Which versions are affected?

Compare what you have installed with 0 → 2.9.10+dfsg-2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-770: Allocation of Resources Without Limits or Throttling. EPSS 2.74%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 8, 2018 · NIST NVD

    Detected

    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.

  2. Oct 14, 2026 · NIST NVD

    Updated

    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.

  3. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libxml2 fixed in 2.9.10+dfsg-2; libxml2 fixed in 2.9.10+dfsg-2; libxml2 fixed in 2.9.10+dfsg-2

  4. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libxml2 fixed in 2.9.10+dfsg-2

  5. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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.

  6. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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.

  7. Oct 14, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2017-18258

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2017-18258

    30-day exploitation probability 2.7%

    first.org
  • NIST NVDVulnerability recordCVE-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 consumption) via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is required for a legitimate file.

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2017-18258
    osv.dev

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.