CVE-2026-28351
published 2026-02-27CVE-2026-28351: 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…
PriorityP428medium5.3CVSS 3.1
AVNACLPRNUINSUCNINAL
EPSS
0.42%
33.9th percentile
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.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | pypdf | < pypdf 6.9.0-1 (forky) | pypdf 6.9.0-1 (forky) |
| debian | pypdf2 | < pypdf 6.9.0-1 (forky) | pypdf 6.9.0-1 (forky) |
| py-pdf | pypdf | < 6.7.4 | 6.7.4 |
| pypdf_project | pypdf | < 6.7.4 | 6.7.4 |
| pypdf_project | pypdf | >= 0 < 6.9.0-1 | 6.9.0-1 |
| pypdf_project | pypdf | >= 0 < 6.7.4 | 6.7.4 |
CVSS provenance
nvdv3.15.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
nvdv4.06.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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
osv6.9MEDIUM
vendor_debian6.9MEDIUM
vendor_redhat6.9MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Red Hat
pypdf: pypdf: Denial of Service via crafted PDF with RunLengthDecode filter
vendor_redhat·2026-02-27·CVSS 6.9
CVE-2026-28351 [MEDIUM] CWE-770 pypdf: pypdf: Denial of Service via crafted PDF with RunLengthDecode filter
pypdf: pypdf: Denial of Service via crafted PDF with RunLengthDecode filter
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.
A flaw was found in pypdf, a free and open-source pure-python PDF library. An attacker can exploit this vulnerability by crafting a malicious PDF file that, when parsed, leads to excessive memory consumption. This occurs specifically when processing the content stream using the RunLengthDecode filter. Successful exploitation can result in a Denial of Service (DoS) condition
Debian
CVE-2026-28351: pypdf - pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4,...
vendor_debian·2026·CVSS 6.9
CVE-2026-28351 [MEDIUM] CVE-2026-28351: pypdf - pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4,...
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.
Scope: local
bookworm: open
forky: resolved (fixed in 6.9.0-1)
sid: resolved (fixed in 6.9.0-1)
trixie: open
VulDB
py-pdf pypdf up to 6.7.3 resource consumption (EUVD-2026-9070 / Nessus ID 300281)
vuldb·2026-06-01·CVSS 6.9
CVE-2026-28351 [MEDIUM] py-pdf pypdf up to 6.7.3 resource consumption (EUVD-2026-9070 / Nessus ID 300281)
A vulnerability has been found in py-pdf pypdf up to 6.7.3 and classified as problematic. The affected element is an unknown function. This manipulation causes resource consumption.
This vulnerability is handled as CVE-2026-28351. The attack can be initiated remotely. There is not any exploit available.
The affected component should be upgraded.
GHSA
pypdf: Manipulated RunLengthDecode streams can exhaust RAM
ghsa·2026-02-28
CVE-2026-28351 [MEDIUM] CWE-400 pypdf: Manipulated RunLengthDecode streams can exhaust RAM
pypdf: Manipulated RunLengthDecode streams can exhaust RAM
### Impact
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.
### Patches
This has been fixed in [pypdf==6.7.4](https://github.com/py-pdf/pypdf/releases/tag/6.7.4).
### Workarounds
If you cannot upgrade yet, consider applying the changes from PR [#3664](https://github.com/py-pdf/pypdf/pull/3664).
OSV
pypdf: Manipulated RunLengthDecode streams can exhaust RAM
osv·2026-02-28
CVE-2026-28351 [MEDIUM] pypdf: Manipulated RunLengthDecode streams can exhaust RAM
pypdf: Manipulated RunLengthDecode streams can exhaust RAM
### Impact
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.
### Patches
This has been fixed in [pypdf==6.7.4](https://github.com/py-pdf/pypdf/releases/tag/6.7.4).
### Workarounds
If you cannot upgrade yet, consider applying the changes from PR [#3664](https://github.com/py-pdf/pypdf/pull/3664).
OSV
CVE-2026-28351: pypdf is a free and open-source pure-python PDF library
osv·2026-02-27·CVSS 6.9
CVE-2026-28351 [MEDIUM] CVE-2026-28351: pypdf is a free and open-source pure-python PDF library
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.
No detection rules found.
No public exploits indexed.
2026-02-27
Published