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Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-28351

CVE-2026-28351

MEDIUM6.9

Manipulated RunLengthDecode streams can exhaust RAM

Published Feb 27, 2026

Modified 1 weeks ago

Details

pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter. This has been fixed in pypdf 6.7.4. As a workaround, consider applying the changes from PR #3664.

References

https://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc858

https://github.com/py-pdf/pypdf/pull/3664

https://github.com/py-pdf/pypdf/releases/tag/6.7.4

https://github.com/py-pdf/pypdf/security/advisories/GHSA-f2v5-7jq9-h8cg

https://www.cve.org/CVERecord?id=CVE-2026-28351

CVSS Analysis

CVSS v4.0

6.9

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Attack Requirements

NoneAT:N

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Vulnerable System

Vuln. Confidentiality

NoneVC:N

Vuln. Integrity

NoneVI:N

Vuln. Availability

LowVA:L

Subsequent System

Subseq. Confidentiality

NoneSC:N

Subseq. Integrity

NoneSI:N

Subseq. Availability

NoneSA:N

6.9/CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Weakness Type (CWE)

Resource Management

Resource Exhaustion

Ecosystems

Timeline

PublishedFeb 27, 2026

ModifiedMar 3, 2026

CVE-2026-28351 | Mondoo Vulnerability Intelligence