What is CVE-2022-34503?

CVE-2022-34503 is a medium-severity vulnerability in Qpdf Project, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2022-07-22.

How severe is CVE-2022-34503?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Qpdf Project

CVE-2022-34503

QPDF v8.4.2 was discovered to contain a heap buffer overflow via the function QPDF::processXRefStream. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted PDF file.

Vulnerability class: Buffer Overflow

Published 2022-07-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.008 (53.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.000

Affected products

Qpdf Project — versions 8.4.2

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/qpdf/qpdf/issues/701 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2022-34503?: CVE-2022-34503 is a medium-severity vulnerability in Qpdf Project, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2022-07-22.
How severe is CVE-2022-34503?: Medium severity. CVSS v3 base score is 6.5 out of 10.