# CVE-2026-65833: iopress: buffer over-read in chunked HTTP parser

Status: published. Published: 2026-11-11. Updated: 2026-11-11.

iopress is a native HTTP server for Node.js with platform-specific async I/O. Prior to version 1.0.5, the chunked-transfer-encoding HTTP request parser in @iopress/core reads past the end of the input buffer when a request declares a chunk size larger than the body actually received. This results in a heap-buffer-over-read. This issue has been patched in version 1.0.5.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- senapati484 / iopress: < 1.0.5 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-126

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/senapati484/iopress/security/advisories/GHSA-pvr5-58cf-rgv6 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/senapati484/iopress/releases/tag/v1.0.5 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-65833; retrieved 2026-11-11; source updated 2026-11-11

Revision: f7abfb661b95dab8f8e69cad7dc3f1645913e7b7cf54405fc595a40dda599537

Canonical: https://y2.dev/cve/CVE-2026-65833

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