CVE-2010-1866

Publication date 7 May 2010

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
php5	10.04 LTS lucid	Fixed 5.3.2-1ubuntu4.5
	9.10 karmic	Not affected
	9.04 jaunty	Not affected
	8.04 LTS hardy	Not affected
	6.06 LTS dapper	Not affected

Notes

mdeslaur

5.3 only This is MOPS-2010-003

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
php5	Upstream: http://svn.php.net/viewvc?view=revision&revision=298700

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-989-1
PHP vulnerabilities
20 September 2010