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Sid 3-14772


FILE-IMAGE libpng malformed chunk denial of service attempt


Certain chunk handlers in libpng before 1.0.29 and 1.2.x before 1.2.21 allow remote attackers to cause a denial of service (crash) via crafted (1) pCAL (pnghandlepCAL), (2) sCAL (pnghandlesCAL), (3) tEXt (pngpushreadtEXt), (4) iTXt (pnghandleiTXt), and (5) ztXT (pnghandle_ztXt) chunking in PNG images, which trigger out-of-bounds read operations.


CVSS base score 5.0 CVSS impact score 2.9 CVSS exploitability score 10.0 confidentialityImpact NONE integrityImpact NONE availabilityImpact NONE

Detailed information

Affected systems

  • libpng libpng 1.0.28
  • libpng libpng 1.2.20

Ease of attack

False positives

None known

False negatives

None known

Corrective action

Upgrade to the latest non-affected version of the software.

Apply the appropriate vendor supplied patches.


  • Talos research team.
  • This document was generated from data supplied by the national vulnerability database, a product of the national institute of standards and technology.
  • For more information see nvd.

Additional References