The dechunk filter in PHP 5.3 through 5.3.2, when decoding an HTTP chunked encoding…
Priority MEDIUM 52CWE-190Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.06723 93rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:php:php:*:*:*:*:*:*:*:* | 5.3.0 – 5.3.2 | Vulnerable | PHP |
| cpe:2.3:o:opensuse:opensuse:11.1:*:*:*:*:*:*:* | 11.1 | Vulnerable | openSUSE |
| cpe:2.3:o:opensuse:opensuse:11.2:*:*:*:*:*:*:* | 11.2 | Vulnerable | openSUSE |
| cpe:2.3:o:opensuse:opensuse:11.3:*:*:*:*:*:*:* | 11.3 | Vulnerable | openSUSE |
| cpe:2.3:o:suse:linux_enterprise:10.0:sp3:*:*:*:*:*:* | 10.0 sp3 | Vulnerable | SUSE |
| cpe:2.3:o:suse:linux_enterprise:11.0:-:*:*:*:*:*:* | 11.0 | Vulnerable | SUSE |
| cpe:2.3:o:suse:linux_enterprise:11.0:sp1:*:*:*:*:*:* | 11.0 sp1 | Vulnerable | SUSE |
- cpe:2.3:a:php:php:*:*:*:*:*:*:*:* Versions 5.3.0 – 5.3.2 Vulnerable ·PHP
- cpe:2.3:o:opensuse:opensuse:11.1:*:*:*:*:*:*:* Versions 11.1 Vulnerable ·openSUSE
- cpe:2.3:o:opensuse:opensuse:11.2:*:*:*:*:*:*:* Versions 11.2 Vulnerable ·openSUSE
- cpe:2.3:o:opensuse:opensuse:11.3:*:*:*:*:*:*:* Versions 11.3 Vulnerable ·openSUSE
- cpe:2.3:o:suse:linux_enterprise:10.0:sp3:*:*:*:*:*:* Versions 10.0 sp3 Vulnerable ·SUSE
- cpe:2.3:o:suse:linux_enterprise:11.0:-:*:*:*:*:*:* Versions 11.0 Vulnerable ·SUSE
- cpe:2.3:o:suse:linux_enterprise:11.0:sp1:*:*:*:*:*:* Versions 11.0 sp1 Vulnerable ·SUSE
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 3 products
- Red Hat Enterprise Linux 4
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2010-1866
- 2026-10-03 Alias added: GHSA-cwwq-64rr-rv47
References
Sources
- CVE-2010-1866 · CVE Program
- CVE-2010-1866 · NVD
- FIRST EPSS
- GHSA-cwwq-64rr-rv47 · GitHub Advisory Database · CC BY 4.0
- CVE-2010-1866 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences