How severe is CVE-2026-84310?

CVE-2026-84310 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-2026-84310 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-2026-84310?

CVE-2026-84310 affects Pypdf Project Pypdf. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-84310?

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

When was CVE-2026-84310 published?

CVE-2026-84310 was published on 2026-09-01 and last updated on 2026-10-05.

CVE-2026-84310

CVE-2026-84310 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-405.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
CVSS v4: 4.8
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-405
Affected product: Pypdf Project Pypdf
Published: 2026-09-01
Last modified: 2026-10-05

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_doc_common.py _get_outline to consume long runtimes and large amounts of memory when retrieving document outlines with large numbers of entries or deeply nested reused paths because the traversal lacked global entry-count and nesting-depth limits. This issue is fixed in version 6.16.1.

Frequently asked questions

What is CVE-2026-84310?: pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_doc_common.py _get_outline to consume long runtimes and large amounts of memory when retrieving document outlines with large numbers of entries or deeply nested reused paths because the traversal lacked global entry-count and nesting-depth limits. This issue is fixed in version 6.16.1.
How severe is CVE-2026-84310?: CVE-2026-84310 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-2026-84310 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-2026-84310?: CVE-2026-84310 affects Pypdf Project Pypdf. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-84310?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-84310 published?: CVE-2026-84310 was published on 2026-09-01 and last updated on 2026-10-05.

References

Affected products (1)

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

More vulnerabilities in Pypdf Project Pypdf

CVE-2026-103000 — High (CVSS 7.5): pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large…
CVE-2026-102999 — High (CVSS 7.5): pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF containing many embedded files…
CVE-2026-102998 — High (CVSS 7.5): pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can…
CVE-2026-102997 — High (CVSS 7.5): pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF containing a partially…
CVE-2026-102996 — High (CVSS 7.5): pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can provide a TrueType or Type1…
CVE-2026-102995 — High (CVSS 7.5): pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can place unusually large…

All CVEs affecting Pypdf Project Pypdf →

Other CWE-405 vulnerabilities

CVE-2025-53633 — Critical (CVSS 9.8): Chall-Manager is a platform-agnostic system able to start Challenges on Demand of a player. When decoding a scenario…
CVE-2026-104817 — High (CVSS 8.7): Misskey is an open source, federated social media platform. From 12.112.1 until 2026.7.0, the unauthenticated fetch-rss…
CVE-2021-38447 — High (CVSS 8.6): OCI OpenDDS versions prior to 3.18.1 are vulnerable when an attacker sends a specially crafted packet to flood target…
CVE-2025-42874 — High (CVSS 7.9): SAP NetWeaver remote service for Xcelsius allows an attacker with network access and high privileges to execute…
CVE-2026-96960 — High (CVSS 7.5): Asymmetric resource consumption (amplification) in .NET allows an unauthorized attacker to deny service over a network.
CVE-2026-97031 — High (CVSS 7.5): Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a…

Browse all CWE-405 vulnerabilities →