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CVE-2011-1944: Integer overflow in xpath.c in libxml2 2.6.x through 2.6.32 and 2.7.x through 2.7.8, and libxml 1.8.16 and earlier, allows context-dependent…

CriticalCVSS 9.3 · v2.0—Proof of concept Fix available

Noroxi assessment

Priority: Plan (action score 41/100)

  • Public proof-of-concept code exists (Exploit-DB); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 13.4% (FIRST EPSS); higher than 96.4% of all records.
  • Fixed version: libxml2 (Debian:12) 2.7.8.dfsg-3; libxml2 (Debian:5.0) 2.6.32.dfsg-5+lenny4; libxml2 (Debian:6.0) 2.7.8.dfsg-2+squeeze1.

Add it to your regular patch cycle. Upgrade to libxml2 (Debian:12) 2.7.8.dfsg-3; libxml2 (Debian:5.0) 2.6.32.dfsg-5+lenny4; libxml2 (Debian:6.0) 2.7.8.dfsg-2+squeeze1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Integer overflow in xpath.c in libxml2 2.6.x through 2.6.32 and 2.7.x through 2.7.8, and libxml 1.8.16 and earlier, allows context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted XML file that triggers a heap-based buffer overflow when adding a new namespace node, related to handling of XPath expressions.

Published
Sep 2, 2011
Updated
Jun 16, 2026
EPSS
13.4% · 96th percentile

Report tools

JSON

Action score

41

Plan

Add it to your regular patch cycle.

CVSS
37 / 40 · 9.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
4 / 30 · 13.4%

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  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

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  • when exploit code appears or is weaponized
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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
xmlsoftlibxml2
xmlsoftlibxml

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • xmlsoft libxmlup to 1.8.16 inclusive
  • xmlsoft libxml1.5.0
  • xmlsoft libxml1.6.0
  • xmlsoft libxml1.6.1
  • xmlsoft libxml1.6.2
  • xmlsoft libxml1.7.0
  • xmlsoft libxml1.7.1
  • xmlsoft libxml1.7.2
+12 more rows
  • xmlsoft libxml1.7.3
  • xmlsoft libxml1.7.4
  • xmlsoft libxml1.8.0
  • xmlsoft libxml1.8.1
  • xmlsoft libxml1.8.10
  • xmlsoft libxml1.8.11
  • xmlsoft libxml1.8.12
  • xmlsoft libxml1.8.13
  • xmlsoft libxml1.8.14
  • xmlsoft libxml1.8.15
  • xmlsoft libxml1.8.2
  • xmlsoft libxml1.8.3

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12libxml2before 2.7.8.dfsg-32.7.8.dfsg-3
Debian:5.0libxml2before 2.6.32.dfsg-5+lenny42.6.32.dfsg-5+lenny4
Debian:6.0libxml2before 2.7.8.dfsg-2+squeeze12.7.8.dfsg-2+squeeze1
openSUSE:Tumbleweedlibxml2before 2.9.4-1.222.9.4-1.22
Red Hat:enterprise_linux:5::clientlibxml2before 0:2.6.26-2.1.12.el5_7.20:2.6.26-2.1.12.el5_7.2
Red Hat:enterprise_linux:5::clientlibxml2-debuginfobefore 0:2.6.26-2.1.12.el5_7.20:2.6.26-2.1.12.el5_7.2
Red Hat:enterprise_linux:5::clientlibxml2-pythonbefore 0:2.6.26-2.1.12.el5_7.20:2.6.26-2.1.12.el5_7.2
Red Hat:enterprise_linux:5::client_workstationlibxml2-develbefore 0:2.6.26-2.1.12.el5_7.20:2.6.26-2.1.12.el5_7.2
Red Hat:enterprise_linux:6::clientlibxml2before 0:2.7.6-4.el60:2.7.6-4.el6
Red Hat:enterprise_linux:6::clientlibxml2-debuginfobefore 0:2.7.6-4.el60:2.7.6-4.el6
Red Hat:enterprise_linux:6::clientlibxml2-develbefore 0:2.7.6-4.el60:2.7.6-4.el6
Red Hat:enterprise_linux:6::clientlibxml2-pythonbefore 0:2.7.6-4.el60:2.7.6-4.el6
Red Hat:enterprise_linux:6::clientlibxml2-staticbefore 0:2.7.6-4.el60:2.7.6-4.el6
Red Hat:enterprise_linux:6::clientmingw32-libxml2before 0:2.7.6-6.el6_30:2.7.6-6.el6_3
Red Hat:enterprise_linux:6::clientmingw32-libxml2-debuginfobefore 0:2.7.6-6.el6_30:2.7.6-6.el6_3
Red Hat:enterprise_linux:6::clientmingw32-libxml2-staticbefore 0:2.7.6-6.el6_30:2.7.6-6.el6_3

Same product

xmlsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2008-3529Heap-based buffer overflow in the xmlParseAttValueComplex function in parser.c in libxml2 before 2.7.0 allows context-dependent attackers…
    47Plan
  • CVE-2017-7376Buffer overflow in libxml2 allows remote attackers to execute arbitrary code by leveraging an incorrect limit for port values when handling…
    46Plan
  • CVE-2022-40303An issue was discovered in libxml2 before 2.10.3.
    42Plan

Published before and after this one in the same product

  • ← EarlierCVE-2008-3281Aug 27, 2008 · libxml2 2.6.32 and earlier does not properly detect recursion during entity expansion in an attribute value, which allows context-dependent…
    27Monitor
  • ← EarlierCVE-2008-4409Oct 3, 2008 · libxml2 2.7.0 and 2.7.1 does not properly handle "predefined entities definitions" in entities, which allows context-dependent attackers to…
    23Monitor
  • Later →CVE-2012-0841Dec 21, 2012 · libxml2 before 2.8.0 computes hash values without restricting the ability to trigger hash collisions predictably, which allows…
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:libxml22.7.8.dfsg-3 · Debian:12Package registry (OSV)
opensuse:libxml22.9.4-1.22 · openSUSE:TumbleweedPackage registry (OSV)
red hat:libxml20:2.7.6-4.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:libxml2-debuginfo0:2.7.6-4.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:libxml2-devel0:2.7.6-4.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:libxml2-python0:2.7.6-4.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:libxml2-static0:2.7.6-4.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:mingw32-libxml20:2.7.6-6.el6_3 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:mingw32-libxml2-debuginfo0:2.7.6-6.el6_3 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:mingw32-libxml2-static0:2.7.6-6.el6_3 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entryremote2011-05-31

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-95 d
  2. Published
  3. TodayNov 15, 2026+5553 d

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Not on record for this CVE: EPSS history · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

    If successful

    Confidentiality
    C · data can be read
    Integrity
    C · data or configuration can be modified
    Availability
    C · the service can be disrupted
    Attack complexity
    M
    Confidentiality impact
    C
    Integrity impact
    C
    Availability impact
    C

    Weakness class (CWE)

    CWE-189 · Numeric Errors

    CVSS vector

    AV:N/AC:M/Au:N/C:C/I:C/A:C

    nvd-primary

    Attack context

    MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

    MITRE has no CAPEC/ATT&CK mapping for this CWE.

    References

    Show all references (15 more)

    Vendor advisories and official records. Exploit/PoC links are deliberately left out.

    All records