Read the docs
TI-2009-02361 Aliases CVE-2009-2473GHSA-9vc6-7j3x-7x4v

neon before 0.28.6, when expat is used, does not properly detect recursion during entity…

Priority LOW 31CWE-399Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
Medium
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Partial
Fix status
Partial Red Hat: 7 fixed, 1 without a fix

Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-399 and the CVSS impact.

Summary

neon before 0.28.6, when expat is used, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.

Why it matters now

EPSS 0.08437 95th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 7 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:webdav:neon:0.28.6:*:*:*:*:*:*:*0.28.6VulnerableWebdav
  • cpe:2.3:a:webdav:neon:0.28.6:*:*:*:*:*:*:* Versions 0.28.6 Vulnerable ·Webdav

Remediation

Red Hat 2 advisories

  • RHSA-2013:0131 Released 2013-01-08 · Red Hat rating Low
    gnome-vfs2 security and bug fix update
    • Red Hat Enterprise Linux (v. 5 server) gnome-vfs2-2.16.2-10.el5, gnome-vfs2-2.16.2-10.el5.i386, gnome-vfs2-2.16.2-10.el5.ia64 +9
    • Red Hat Enterprise Linux Desktop (v. 5 client) gnome-vfs2-2.16.2-10.el5, gnome-vfs2-2.16.2-10.el5.i386, gnome-vfs2-smb-2.16.2-10.el5 +1
    • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) gnome-vfs2-2.16.2-10.el5, gnome-vfs2-devel-2.16.2-10.el5, gnome-vfs2-devel-2.16.2-10.el5.i386
  • RHSA-2009:1452 Released 2009-09-21 · Red Hat rating Moderate
    neon security update
    • Red Hat Enterprise Linux (v. 5 server) neon-0.25.5-10.el5_4.1, neon-0.25.5-10.el5_4.1.i386, neon-0.25.5-10.el5_4.1.ia64 +5
    • Red Hat Enterprise Linux AS version 4 neon-0.24.7-4.el4_8.2, neon-0.24.7-4.el4_8.2.i386, neon-0.24.7-4.el4_8.2.ia64 +5
    • Red Hat Enterprise Linux Desktop (v. 5 client) neon-0.25.5-10.el5_4.1, neon-0.25.5-10.el5_4.1.i386
    • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) neon-0.25.5-10.el5_4.1, neon-devel-0.25.5-10.el5_4.1, neon-devel-0.25.5-10.el5_4.1.i386
    • Red Hat Enterprise Linux Desktop version 4 neon-0.24.7-4.el4_8.2, neon-0.24.7-4.el4_8.2.i386, neon-devel-0.24.7-4.el4_8.2 +1
    • Red Hat Enterprise Linux ES version 4 neon-0.24.7-4.el4_8.2, neon-0.24.7-4.el4_8.2.i386, neon-0.24.7-4.el4_8.2.ia64 +3
    • Red Hat Enterprise Linux WS version 4 neon-0.24.7-4.el4_8.2, neon-0.24.7-4.el4_8.2.i386, neon-0.24.7-4.el4_8.2.ia64 +3

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 4AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux (v. 5 server)Fixed RHSA-2009:1452, RHSA-2013:0131
Red Hat Enterprise Linux AS version 4Fixed RHSA-2009:1452
Red Hat Enterprise Linux Desktop (v. 5 client)Fixed RHSA-2009:1452, RHSA-2013:0131
Red Hat Enterprise Linux Desktop Workstation (v. 5 client)Fixed RHSA-2009:1452, RHSA-2013:0131
Red Hat Enterprise Linux Desktop version 4Fixed RHSA-2009:1452
Red Hat Enterprise Linux ES version 4Fixed RHSA-2009:1452
Red Hat Enterprise Linux WS version 4Fixed RHSA-2009:1452

Timeline

  1. 2026-10-02 Threatist record created from CVE-2009-2473
  2. 2026-10-03 Alias added: GHSA-9vc6-7j3x-7x4v
  3. 2026-10-24 EPSS moved to the 95th–99th percentile
  4. 2026-10-25 EPSS moved to the 90th–95th percentile
  5. 2026-10-31 EPSS moved to the 95th–99th percentile

References

Patch 1

Advisory 6

Other 4

  • TI-2004-00154 Multiple format string vulnerabilities in (1) neon 0.24.4 and earlier, and other products… CVSS 2.0MEDIUM 6.8
  • TI-2004-00364 Heap-based buffer overflow in the ne_rfc1036_parse date parsing function for the neon… CVSS 2.0HIGH 7.5
  • TI-2009-02362 neon before 0.28.6, when OpenSSL or GnuTLS is used, does not properly handle a '\0'… CVSS 2.0MEDIUM 5.8
  • TI-2008-03588 neon 0.28.0 through 0.28.2 allows remote servers to cause a denial of service (NULL… CVSS 2.0MEDIUM 4.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences