CVE-2009-4257

Heap-based buffer overflow in datatype/smil/common/smlpkt.cpp in smlrender.dll in RealNetworks...

9.3 High

Heap-based buffer overflow in datatype/smil/common/smlpkt.cpp in smlrender.dll in RealNetworks RealPlayer 10, RealPlayer 10.5 6.0.12.1040 through 6.0.12.1741, RealPlayer 11 11.0.0 through 11.0.4, RealPlayer Enterprise, Mac RealPlayer 10 and 10.1, Linux RealPlayer 10 and 11.0.0, and Helix Player 10.x and 11.0.0 allows remote attackers to execute arbitrary code via an SMIL file with crafted string lengths.

Exploit likelihood

8.49%Down 1.4 points since Feb 4, 2022

What each source reports

NVD Score used 9.3

Record: CVE-2009-4257
CVSS 2.0: 9.3 HighAV:N/AC:M/Au:N/C:C/I:C/A:C
Weakness: CWE-119
Updated: 2026-11-02

CVE List No score

Record: CVE-2009-4257
Updated: 2026-11-02

EUVDEUVD-2009-4226 No score

Record: EUVD-2009-4226
Updated: 2026-11-03

GitHub AdvisoriesGHSA-3gv9-4xxv-89c6 No score

Heap-based buffer overflow in datatype/smil/common/smlpkt.cpp in smlrender.dll in RealNetworks...

Record: GHSA-3gv9-4xxv-89c6
Weakness: CWE-119
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`HelixPlayer` Red Hat:enterprise_linux:4::as From an advisory covering 8 CVEs	before 1:1.0.6-1.el4_8.1	1:1.0.6-1.el4_8.1
`HelixPlayer-debuginfo` Red Hat:enterprise_linux:4::as From an advisory covering 8 CVEs	before 1:1.0.6-1.el4_8.1	1:1.0.6-1.el4_8.1
`HelixPlayer` Red Hat:enterprise_linux:4::desktop From an advisory covering 8 CVEs	before 1:1.0.6-1.el4_8.1	1:1.0.6-1.el4_8.1
`HelixPlayer-debuginfo` Red Hat:enterprise_linux:4::desktop From an advisory covering 8 CVEs	before 1:1.0.6-1.el4_8.1	1:1.0.6-1.el4_8.1
`HelixPlayer` Red Hat:enterprise_linux:4::es From an advisory covering 8 CVEs	before 1:1.0.6-1.el4_8.1	1:1.0.6-1.el4_8.1
`HelixPlayer-debuginfo` Red Hat:enterprise_linux:4::es From an advisory covering 8 CVEs	before 1:1.0.6-1.el4_8.1	1:1.0.6-1.el4_8.1
`HelixPlayer` Red Hat:enterprise_linux:4::ws From an advisory covering 8 CVEs	before 1:1.0.6-1.el4_8.1	1:1.0.6-1.el4_8.1
`HelixPlayer-debuginfo` Red Hat:enterprise_linux:4::ws From an advisory covering 8 CVEs	before 1:1.0.6-1.el4_8.1	1:1.0.6-1.el4_8.1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2009-4257 is a high vulnerability (CVSS 9.3) in Realnetworks Helix Player, published January 25, 2010. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 8.49%, the 95th percentile. No source names a fixed version.

References

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