CVE-2026-115585
published 2026-10-23CVE-2026-115585: pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an incomplete remediation for repeated malformed cross-reference entries in…
PriorityP335high7.1CVSS 4.0
AVNACLATNPRNUIPVCNVINVAHSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.41%
35.0th percentile
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an incomplete remediation for repeated malformed cross-reference entries in GHSA-55h5-xmcq-c37v could still trigger a complete PDF stream reload during each recovery attempt even when a recovery cache was present, causing crafted cross-reference streams to produce long runtimes. This issue is fixed in version 6.21.2.
Affected
17 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| ansible-automation-platform-25 | lightspeed-chatbot-rhel8 | — | — |
| ansible-automation-platform | automation-orchestrator-backend-rhel9 | — | — |
| lightspeed-core | lightspeed-stack-rhel9 | — | — |
| lightspeed-core | rag-tool-cpu-rhel9 | — | — |
| lightspeed-core | rag-tool-cuda-12.9-rhel9 | — | — |
| openshift-lightspeed-tech-preview | lightspeed-rag-tool-rhel9 | — | — |
| openshift-lightspeed | lightspeed-ocp-rag-rhel9 | — | — |
| py-pdf | pypdf | < 6.21.2 | 6.21.2 |
| pypdf_project | pypdf | >= 0 < 6.21.2 | 6.21.2 |
| quay | quay-rhel8 | — | — |
| quay | quay-rhel9 | — | — |
| rhelai3 | bootc-cuda-rhel9 | — | — |
| rhelai3 | bootc-gaudi-rhel9 | — | — |
| rhelai3 | bootc-rocm-rhel9 | — | — |
| rhelai3 | disk-image-cuda-rhel9 | — | — |
| rhoai | odh-llama-stack-core-rhel9 | — | — |
| rhoai | odh-ogx-core-rhel9 | — | — |
CVSS provenance
nvdv4.07.1HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat7.1HIGH
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Red Hat
pypdf: pypdf: Denial of Service via malformed cross-reference streams
vendor_redhat·2026-10-23·CVSS 7.1
CVE-2026-115585 [HIGH] CWE-770 pypdf: pypdf: Denial of Service via malformed cross-reference streams
pypdf: pypdf: Denial of Service via malformed cross-reference streams
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an incomplete remediation for repeated malformed cross-reference entries in GHSA-55h5-xmcq-c37v could still trigger a complete PDF stream reload during each recovery attempt even when a recovery cache was present, causing crafted cross-reference streams to produce long runtimes. This issue is fixed in version 6.21.2.
A flaw was found in pypdf. A remote attacker could cause a Denial of Service (DoS) by convincing a user or automated system to process a crafted PDF file containing repeated malformed cross-reference entries. Due to an issue in the stream recovery caching mechanism, the library repeatedly reloads the entire PDF stream during each rec
GHSA
pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)
ghsa·2026-10-23
CVE-2026-115585 [HIGH] CWE-400 pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)
pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)
### Impact
An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with repeated malformed cross-reference streams.
### Patches
This has been fixed in [pypdf==6.21.2](https://github.com/py-pdf/pypdf/releases/tag/6.21.2).
### Workarounds
If you cannot upgrade yet, consider applying the changes from PR [#4240](https://github.com/py-pdf/pypdf/pull/4240).
### Notes
This is a follow-up to https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v, which had the side-effect of still loading the whole stream again despite the cache being present.
VulDB
py-pdf pypdf up to 6.21.1 input validation
vuldb·2026-10-23·CVSS 7.1
CVE-2026-115585 [HIGH] py-pdf pypdf up to 6.21.1 input validation
A vulnerability was found in py-pdf pypdf up to 6.21.1. It has been declared as problematic. This issue affects some unknown processing. The manipulation results in improper input validation.
This vulnerability is reported as CVE-2026-115585. The attack can be launched remotely. No exploit exists.
It is recommended to upgrade the affected component.
No detection rules found.
No public exploits indexed.
2026-10-23
Published