Vulnerability Database

393,544

Total vulnerabilities in the database

CVE-2008-3964 — libpng / libpng

Off-by-one Error

Multiple off-by-one errors in libpng before 1.2.32beta01, and 1.4 before 1.4.0beta34, allow context-dependent attackers to cause a denial of service (crash) or have unspecified other impact via a PNG image with crafted zTXt chunks, related to (1) the png_push_read_zTXt function in pngread.c, and possibly related to (2) pngtest.c.

  • Published: Sep 11, 2008
  • Updated: Oct 4, 2026
  • CVE: CVE-2008-3964
  • Severity: Medium
  • Exploit:
  • CISA KEV:

CVSS v2:

  • Severity: Medium
  • Score: 4.3
  • AV:N/AC:M/Au:N/C:N/I:N/A:P

CWEs:

Software Affected versions
libpng / libpng < 1.2.32
libpng / libpng = 1.4.0-beta1
libpng / libpng = 1.4.0-beta10
libpng / libpng = 1.4.0-beta11
libpng / libpng = 1.4.0-beta12
libpng / libpng = 1.4.0-beta13
libpng / libpng = 1.4.0-beta14
libpng / libpng = 1.4.0-beta15
libpng / libpng = 1.4.0-beta16
libpng / libpng = 1.4.0-beta17
libpng / libpng = 1.4.0-beta18
libpng / libpng = 1.4.0-beta19
libpng / libpng = 1.4.0-beta2
libpng / libpng = 1.4.0-beta20
libpng / libpng = 1.4.0-beta21
libpng / libpng = 1.4.0-beta22
libpng / libpng = 1.4.0-beta23
libpng / libpng = 1.4.0-beta24
libpng / libpng = 1.4.0-beta25
libpng / libpng = 1.4.0-beta26
libpng / libpng = 1.4.0-beta27
libpng / libpng = 1.4.0-beta28
libpng / libpng = 1.4.0-beta29
libpng / libpng = 1.4.0-beta3
libpng / libpng = 1.4.0-beta30
libpng / libpng = 1.4.0-beta31
libpng / libpng = 1.4.0-beta32
libpng / libpng = 1.4.0-beta33
libpng / libpng = 1.4.0-beta4
libpng / libpng = 1.4.0-beta5
libpng / libpng = 1.4.0-beta6
libpng / libpng = 1.4.0-beta7
libpng / libpng = 1.4.0-beta8
libpng / libpng = 1.4.0-beta9

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.