SB2026091225 - Multiple vulnerabilities in PyPDF

Description

This security bulletin contains information about 3 vulnerabilities.

1) Inefficient Algorithmic Complexity (CVE-ID: N/A)

CWE-ID: CWE-407 - Inefficient Algorithmic Complexity

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to inefficient algorithmic complexity in byte-by-byte FlateDecode stream decompression when processing partially malformed FlateDecode streams. A remote attacker can craft a PDF to cause a denial of service.

2) Resource exhaustion (CVE-ID: N/A)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in the parser for the /Widths entry of TrueType and Type1 fonts when parsing PDF font data. A remote attacker can supply a crafted PDF with unusually large width values to cause a denial of service.

3) Resource exhaustion (CVE-ID: N/A)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: 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]

The vulnerability allows a remote attacker to consume large amounts of memory.

The vulnerability exists due to uncontrolled resource consumption in PyPDF\'s handling of /ToUnicode entries in fonts when parsing unusually large values. A remote attacker can supply a crafted PDF containing unusually large /ToUnicode values to consume large amounts of memory.

This can occur during text extraction.

Remediation

Install update from vendor's website.

References

• https://github.com/py-pdf/pypdf/security/advisories/GHSA-jw7q-gvrg-4vj3
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-g9cg-prrw-2r8q
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3h-c4fm-7vvf