How severe is CVE-2026-48156?

CVE-2026-48156 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-48156 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-48156?

CVE-2026-48156 affects Pypdf Project Pypdf. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-48156?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-48156 have an EU (EUVD) identifier?

Yes. CVE-2026-48156 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32913.

When was CVE-2026-48156 published?

CVE-2026-48156 was published on 2026-05-28 and last updated on 2026-06-17.

CVE-2026-48156

CVE-2026-48156 is a low-severity vulnerability in Pypdf Project Pypdf with a CVSS 3.x base score of 3.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-834.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
CVSS v4: 5.1
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-32913
Weakness: CWE-834
Affected product: Pypdf Project Pypdf
Published: 2026-05-28
Last modified: 2026-06-17

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.

Frequently asked questions

What is CVE-2026-48156?: pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.
How severe is CVE-2026-48156?: CVE-2026-48156 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-48156 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-48156?: CVE-2026-48156 affects Pypdf Project Pypdf. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-48156?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-48156 have an EU (EUVD) identifier?: Yes. CVE-2026-48156 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32913.
When was CVE-2026-48156 published?: CVE-2026-48156 was published on 2026-05-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:*

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