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Servers and applications

CVE-2010-1866

The dechunk filter in PHP 5.3 through 5.3.2, when decoding an HTTP chunked encoding stream, allows context-dependent attackers to cause a denial of service (crash) and possibly trigger memory corruption via a negative chunk size, which bypasses a signed comparison, related to an integer overflow in the chunk size decoder.

Severity
Critical 9.8
Published
7 May 2010
Last changed
16 Jun 2026
Added to UpHeron
14 Oct 2026
Exploit chance
6.7% in the next 30 daysHigher than 94% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Integer overflow (CWE-190)
Attack
Over the network · No login needed · No user action needed
Attacker can
Read data · Change data · Take it down
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Sources
NVD

Affected software

SoftwareAffected versions
PHPServers and applications · cpe:a:php:php
  • From 5.3.0 up to 5.3.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2010-1866
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2010-1866