Buffer overflow in Imgproxy
CVE-2026-123615
imgproxy 3.3.0 before 4.0.17 contains an out-of-bounds heap read and write in the ICO loader's BMP header reconstruction (vips_foreign_load_ico_header in vips/icoload.c) when an ICO entry declares a tiny data size, causing unvalidated header fields to be read and written past the allocated buffer. Unauthenticated remote attackers can supply a crafted ICO image to corrupt adjacent heap chunk metadata, triggering a glibc abort that crashes the worker.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/imgproxy/imgproxy/security/advisories/GHSA-494m-4556-wf5p (vendor-advisory)
- www.vulncheck.com/advisories/imgproxy-before-4.0.17-out-of-bounds-write-in-ico-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123615?
- CVE-2026-123615 is a high-severity vulnerability in Imgproxy, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-11-08.
- How severe is CVE-2026-123615?
- High severity. CVSS v3 base score is 7.5 out of 10.