Vulnerability · Published Aug 31, 2026 · Assigned by VulnCheck

CVE-2026-82864pdfme pdf-lib before 5.5.10 Denial of Service via Decompression Bomb

Medium 6.5

In plain English

A medium-severity security flaw in pdf-lib from pdfme. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 62.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

pdfme pdf-lib versions before 5.5.10 contain an unbounded buffer growth vulnerability in the DecodeStream.ensureBuffer() method that allows attackers to cause denial of service by supplying a crafted PDF with a FlateDecode stream containing a decompression bomb. Attackers can upload a small compressed PDF that decompresses to hundreds of megabytes, exhausting memory and crashing the Node.js process or freezing browser tabs during PDF parsing.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@pdfme/pdf-lib	5.5.10	GHSA-vrqm-gvq7-rrwh

Affected products (as reported)

Vendor	Product	Versions
pdfme	pdf-lib	0 – before 5.5.10

Weakness: CWE-409 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-vrqm-gvq7-rrwh) vendor-advisory
VulnCheck Advisory: pdfme pdf-lib before 5.5.10 Denial of Service via Decompression Bomb third-party-advisory