What is CVE-2015-8710?

CVE-2015-8710 is a critical-severity vulnerability in Xmlsoft Libxml2, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2016-04-11.

How severe is CVE-2015-8710?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2015-8710 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Xmlsoft Libxml2

CVE-2015-8710

The htmlParseComment function in HTMLparser.c in libxml2 allows attackers to obtain sensitive information, cause a denial of service (out-of-bounds heap memory access and application crash), or possibly have unspecified other impact via an unclosed HTML comment.

Vulnerability class: Buffer Overflow

Published 2016-04-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.049 (92.0th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.049 · newest: 0.049 · change: 0.000

Affected products

Xmlsoft Libxml2
Debian Linux — versions 7.0, 8.0, 9.0

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

Karm/CVE-2015-8710

References

hackerone.com/reports/57125 (Third Party Advisory)
bugzilla.gnome.org/show_bug.cgi (Issue Tracking)
www.debian.org/security/2015/dsa-3430 (vendor-advisory, Third Party Advisory)
www.openwall.com/lists/oss-security/2015/09/13/1 (mailing-list, Mailing List)
rhn.redhat.com/errata/RHSA-2016-1089.html (vendor-advisory, Third Party Advisory)
git.gnome.org/browse/libxml2/commit/ (Third Party Advisory)
www.openwall.com/lists/oss-security/2015/04/19/4 (mailing-list, Patch, Mailing List)
www.securityfocus.com/bid/79811 (VDB Entry, Third Party Advisory, vdb-entry)
www.openwall.com/lists/oss-security/2015/12/31/7 (mailing-list, Mailing List)

Frequently asked questions

What is CVE-2015-8710?: CVE-2015-8710 is a critical-severity vulnerability in Xmlsoft Libxml2, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2016-04-11.
How severe is CVE-2015-8710?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2015-8710 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.