CVE-2006-1991

The substr_compare function in string.c in PHP 5.1.2 allows context-dependent attackers to cause...

6.4 Medium

The substr_compare function in string.c in PHP 5.1.2 allows context-dependent attackers to cause a denial of service (memory access violation) via an out-of-bounds offset argument.

Exploit likelihood

2.24%Up 0.7 points since Feb 4, 2022

What each source reports

NVD Score used 6.4

The substr_compare function in string.c in PHP 5.1.2 allows context-dependent attackers to cause a denial of service (memory access violation) via an out-of-bounds offset argument.

Record: CVE-2006-1991
CVSS 2.0: 6.4 MediumAV:N/AC:L/Au:N/C:N/I:P/A:P
Weakness: CWE-399
Updated: 2026-11-02

CVE List No score

The substr_compare function in string.c in PHP 5.1.2 allows context-dependent attackers to cause a denial of service (memory access violation) via an out-of-bounds offset argument.

Record: CVE-2006-1991
Updated: 2026-11-02

EUVDEUVD-2006-1991 No score

The substr_compare function in string.c in PHP 5.1.2 allows context-dependent attackers to cause a denial of service (memory access violation) via an out-of-bounds offset argument.

Record: EUVD-2006-1991
Updated: 2026-11-03

GitHub AdvisoriesGHSA-7xcj-pr22-cx39 No score

The substr_compare function in string.c in PHP 5.1.2 allows context-dependent attackers to cause...

The substr_compare function in string.c in PHP 5.1.2 allows context-dependent attackers to cause a denial of service (memory access violation) via an out-of-bounds offset argument.

Record: GHSA-7xcj-pr22-cx39
Updated: 2026-11-02

OSVopenSUSE-SU-2024:11167-1 No score

php7-7.4.24-1.1 on GA media

These are all security issues fixed in the php7-7.4.24-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:11167-1
Updated: 2026-11-02

OSVopenSUSE-SU-2024:11169-1 No score

php8-8.0.11-1.1 on GA media

These are all security issues fixed in the php8-8.0.11-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:11169-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`php7` openSUSE:Tumbleweed From an advisory covering 44 CVEs	before 7.4.24-1.1	7.4.24-1.1
`php8` openSUSE:Tumbleweed From an advisory covering 97 CVEs	before 8.0.11-1.1	8.0.11-1.1

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-2006-1991 is a medium vulnerability (CVSS 6.4) in Php, published April 24, 2006. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.24%, the 82nd percentile. No source names a fixed version.

References

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