CVE-2017-16931
parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro...
CVE-2017-16931 is a critical vulnerability (CVSS 9.8) in Xmlsoft Libxml2, published November 23, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.58%, the 91st percentile. Fixed in libxml2 2.9.5-r0.
parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the xmlParserHandlePEReference function in the case of a '%' character in a DTD name.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the xmlParserHandlePEReference function in the case of a '%' character in a DTD name.
- Record
CVE-2017-16931- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-119
- Updated
- 2026-11-02
CVE List No score
parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the xmlParserHandlePEReference function in the case of a '%' character in a DTD name.
- Record
CVE-2017-16931- Updated
- 2026-11-02
EUVDEUVD-2017-8101 No score
parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the xmlParserHandlePEReference function in the case of a '%' character in a DTD name.
- Record
EUVD-2017-8101- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-7mr2-r9fx-7j9m
parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro...
parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the xmlParserHandlePEReference function in the case of a '%' character in a DTD name.
- Record
GHSA-7mr2-r9fx-7j9m- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-119
- Updated
- 2026-11-02
OSVALPINE-CVE-2017-16931
parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the xmlParserHandlePEReference function in the case of a '%' character in a DTD name.
- Record
ALPINE-CVE-2017-16931- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSV
parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the xmlParserHandlePEReference function in the case of a '%' character in a DTD name.
- Record
CVE-2017-16931- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2017-16931
parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the xmlParserHandlePEReference function in the case of a '%' character in a DTD name.
- Record
DEBIAN-CVE-2017-16931- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2017-16931
parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the xmlParserHandlePEReference function in the case of a '%' character in a DTD name.
- Record
UBUNTU-CVE-2017-16931- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
libxml2Alpine:v3.4 |
before 2.9.5-r0 | 2.9.5-r0 |
libxml2Alpine:v3.5 |
before 2.9.5-r0 | 2.9.5-r0 |
libxml2Alpine:v3.6 |
before 2.9.5-r0 | 2.9.5-r0 |
libxml2Debian:12 |
before 2.9.4+dfsg1-3.1 | 2.9.4+dfsg1-3.1 |
libxml2Debian:13 |
before 2.9.4+dfsg1-3.1 | 2.9.4+dfsg1-3.1 |
libxml2Debian:14 |
before 2.9.4+dfsg1-3.1 | 2.9.4+dfsg1-3.1 |
libxml2Debian:7 |
before 2.8.0+dfsg1-7+wheezy11, plus listed versions 2.8.0+dfsg1-7+nmu12.8.0+dfsg1-7+nmu22.8.0+dfsg1-7+nmu32.8.0+dfsg1-7+wheezy12.8.0+dfsg1-7+wheezy10 Show 8 moreShow less2.8.0+dfsg1-7+wheezy22.8.0+dfsg1-7+wheezy32.8.0+dfsg1-7+wheezy42.8.0+dfsg1-7+wheezy52.8.0+dfsg1-7+wheezy62.8.0+dfsg1-7+wheezy72.8.0+dfsg1-7+wheezy82.8.0+dfsg1-7+wheezy9 |
2.8.0+dfsg1-7+wheezy11 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | affected | |
| 2026-11-02 | created | CVE List, EUVD, GitHub Advisories, NVD, OSV |