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CVE-2026-48155

pypdf: Possible large memory usage for large offsets for layout mode text

4.8 MediumFix available

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 large memory usage. This requires extracting text in layout mode with large character offsets. This vulnerability is fixed in 6.12.0.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Passive

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
Low

Exploit likelihood

0.13%Up 0.1 points since May 29, 2026
90%50%10%1%

What each source reports

CVE List Score used 4.8

pypdf: Possible large memory usage for large offsets for layout mode text

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 large memory usage. This requires extracting text in layout mode with large character offsets. This vulnerability is fixed in 6.12.0.

Record
CVE-2026-48155
CVSS 4.0
4.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-400
Updated
2026-11-02
EUVDEUVD-2026-32914 4.8

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 large memory usage. This requires extracting text in layout mode with large character offsets. This vulnerability is fixed in 6.12.0.

Record
EUVD-2026-32914
CVSS 4.0
4.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-cj93-chg6-vgv8 4.8

pypdf: Possible large memory usage for large offsets for layout mode text

Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting text in layout mode with large character offsets.

Patches

This has been fixed in pypdf==6.12.0.

Workarounds

If developers are unable to immediately upgrade, they should consider applying the changes from PR #3790.

Record
GHSA-cj93-chg6-vgv8
CVSS 4.0
4.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-400
Updated
2026-11-02
GitHub AdvisoriesGHSA-jm82-fx9c-mx94 6.9

pypdf: Missing stream length values ignore defined limits

Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as MAX_DECLARED_STREAM_LENGTH is sometimes ignored. This requires parsing a content stream without a /Length value.

Patches

This has been fixed in pypdf==6.13.3.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3871.

Record
GHSA-jm82-fx9c-mx94
CVSS 4.0
6.9 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-400, CWE-770
Updated
2026-11-02
NVD 4.8

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 large memory usage. This requires extracting text in layout mode with large character offsets. This vulnerability is fixed in 6.12.0.

Record
CVE-2026-48155
CVSS 4.0
4.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/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
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-400
Updated
2026-11-02
OSV 4.8

pypdf: Possible large memory usage for large offsets for layout mode text

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 large memory usage. This requires extracting text in layout mode with large character offsets. This vulnerability is fixed in 6.12.0.

Record
CVE-2026-48155
CVSS 4.0
4.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-400
Updated
2026-11-04
Show 10 moreShow less
OSVDEBIAN-CVE-2026-48155 5.5

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 large memory usage. This requires extracting text in layout mode with large character offsets. This vulnerability is fixed in 6.12.0.

Record
DEBIAN-CVE-2026-48155
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-03
OSVGHSA-cj93-chg6-vgv8 4.8

pypdf: Possible large memory usage for large offsets for layout mode text

Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting text in layout mode with large character offsets.

Patches

This has been fixed in pypdf==6.12.0.

Workarounds

If developers are unable to immediately upgrade, they should consider applying the changes from PR #3790.

Record
GHSA-cj93-chg6-vgv8
CVSS 4.0
4.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-400
Updated
2026-11-02
OSVGHSA-jm82-fx9c-mx94 6.9

pypdf: Missing stream length values ignore defined limits

Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as MAX_DECLARED_STREAM_LENGTH is sometimes ignored. This requires parsing a content stream without a /Length value.

Patches

This has been fixed in pypdf==6.13.3.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3871.

Record
GHSA-jm82-fx9c-mx94
CVSS 4.0
6.9 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-400, CWE-770
Updated
2026-11-02
OSVPYSEC-2026-3016 4.8

pypdf: Possible large memory usage for large offsets for layout mode text

Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting text in layout mode with large character offsets.

Patches

This has been fixed in pypdf==6.12.0.

Workarounds

If developers are unable to immediately upgrade, they should consider applying the changes from PR #3790.

Record
PYSEC-2026-3016
CVSS 4.0
4.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-48155 4.8

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 large memory usage. This requires extracting text in layout mode with large character offsets. This vulnerability is fixed in 6.12.0.

Record
UBUNTU-CVE-2026-48155
CVSS 4.0
4.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVCLSA-2026-1783386116 No score

TuxCare security update for pypdf (2 CVEs)

TuxCare rebuilt pypdf to address 2 CVEs. Fixed in 5.9.0.post9+tuxcare.

Record
CLSA-2026-1783386116
Updated
2026-11-02
OSVMGASA-2026-0577 No score

Updated python-pypdf package fixes security vulnerabilities

This new version fixes several security vulnerabilities.

Record
MGASA-2026-0577
Updated
2026-11-05
OSVopenSUSE-SU-2026:10974-1 No score

python311-pypdf-6.13.0-1.1 on GA media

These are all security issues fixed in the python311-pypdf-6.13.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10974-1
Updated
2026-11-02
OSVROOT-APP-PYPI-CVE-2026-48155 No score

CVE-2026-48155 in pypdf - Patched by Root

Root has patched CVE-2026-48155 in the pypdf package for Root:PyPI. Multiple fixed versions available.

Record
ROOT-APP-PYPI-CVE-2026-48155
Updated
2026-11-02
OSVROOT-APP-PYPI-GHSA-jm82-fx9c-mx94 No score

GHSA-jm82-fx9c-mx94 in pypdf - Patched by Root

Root has patched GHSA-jm82-fx9c-mx94 in the pypdf package for Root:PyPI. Multiple fixed versions available.

Record
ROOT-APP-PYPI-GHSA-jm82-fx9c-mx94
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
pypdf
PyPI
 before 6.12.0
6.12.0
pypdf
PyPI
 before 6.13.3
6.13.3
pypdf
TuxCare:PyPI
 5.9.0 up to 5.9.0.post9+tuxcare, plus listed versions
5.9.0.post1+tuxcare5.9.0.post2+tuxcare5.9.0.post3+tuxcare5.9.0.post4+tuxcare5.9.0.post5+tuxcare5.9.0.post6+tuxcare5.9.0.post7+tuxcare5.9.0.post8+tuxcare
5.9.0.post9+tuxcare
pypdf
Debian:12
 All versions, plus listed versions
3.17.4-13.4.1-13.4.1-1+deb12u14.0.0-14.0.0-1~exp1
Show 13 moreShow less
4.0.1-14.0.2-14.1.0-14.2.0-14.3.1-15.4.0-16.19.0-16.21.0-16.21.1-16.21.4-16.9.0-16.9.2-16.9.2-2
 None known
pypdf
Debian:13
 All versions, plus listed versions
5.4.0-16.19.0-16.21.0-16.21.1-16.21.4-16.9.0-16.9.2-16.9.2-2
 None known
pypdf
Debian:14
 before 6.19.0-1, plus listed versions
5.4.0-16.9.0-16.9.2-16.9.2-2
6.19.0-1
pypdf2
Debian:12
 All versions, plus listed versions
2.12.1-32.12.1-3+deb12u12.12.1-4
 None known
pypdf
PyPI
 before 6.12.0, plus listed versions
1.01.11.101.111.12
Show 45 moreShow less
1.131.21.31.41.51.61.71.81.93.1.03.10.03.11.03.11.13.12.03.12.13.12.23.13.03.14.03.15.03.15.13.15.23.15.33.15.43.15.53.16.03.16.13.16.23.16.33.16.43.17.03.17.13.17.23.17.33.17.43.2.03.2.13.3.03.4.03.4.13.5.03.5.13.5.23.6.03.7.03.7.1
6.12.0
pypdf
PyPI
 before 6.13.3, plus listed versions
1.01.11.101.111.12
Show 45 moreShow less
1.131.21.31.41.51.61.71.81.93.1.03.10.03.11.03.11.13.12.03.12.13.12.23.13.03.14.03.15.03.15.13.15.23.15.33.15.43.15.53.16.03.16.13.16.23.16.33.16.43.17.03.17.13.17.23.17.33.17.43.2.03.2.13.3.03.4.03.4.13.5.03.5.13.5.23.6.03.7.03.7.1
6.13.3
python-pypdf
Mageia:10
From an advisory covering 4 CVEs
 before 6.16.2-1.mga10
6.16.2-1.mga10
Show 14 moreShow less
Affected packages
PackageAffectedFixed
pypdf
Root:PyPI
 before 6.10.1+aikido.4
6.10.1+aikido.46.10.1+aikido.56.10.2+aikido.16.6.0+aikido.116.11.0+aikido.16.11.0+aikido.26.6.0+aikido.126.10.2+aikido.26.10.1+aikido.66.10.1+aikido.76.10.2+aikido.36.11.0+aikido.36.6.0+aikido.136.11.0+aikido.46.6.0+aikido.146.10.2+aikido.46.10.1+aikido.86.10.1+aikido.96.6.0+aikido.156.10.1+aikido.106.11.0+aikido.56.10.2+aikido.5
rootio-pypdf
Root:PyPI
 before 6.10.1+root.io.4
6.10.1+root.io.46.10.1+root.io.56.10.2+root.io.16.6.0+root.io.116.11.0+root.io.16.11.0+root.io.2
pypdf
Root:PyPI
 before 6.6.0+aikido.10
6.6.0+aikido.106.10.1+aikido.46.10.1+aikido.56.10.2+aikido.16.6.0+aikido.116.11.0+aikido.16.12.0+aikido.16.12.1+aikido.16.12.2+aikido.16.11.0+aikido.26.13.2+aikido.16.6.0+aikido.126.10.2+aikido.26.12.1+aikido.26.10.1+aikido.66.12.1+aikido.36.12.0+aikido.26.13.2+aikido.26.10.1+aikido.76.12.0+aikido.36.10.2+aikido.36.11.0+aikido.36.12.2+aikido.26.12.1+aikido.46.6.0+aikido.136.12.0+aikido.46.12.2+aikido.36.11.0+aikido.46.13.2+aikido.36.13.2+aikido.46.12.0+aikido.56.6.0+aikido.146.10.2+aikido.46.12.2+aikido.46.10.1+aikido.86.10.1+aikido.96.6.0+aikido.156.10.1+aikido.106.11.0+aikido.56.12.0+aikido.66.10.2+aikido.56.12.1+aikido.56.12.2+aikido.5
rootio-pypdf
Root:PyPI
 before 6.6.0+root.io.10
6.6.0+root.io.106.10.1+root.io.46.10.1+root.io.56.10.2+root.io.16.6.0+root.io.116.11.0+root.io.16.12.0+root.io.16.12.1+root.io.16.12.2+root.io.16.11.0+root.io.2
pypdf2
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1.23+git20141008-11.25.1-11.25.1-1ubuntu0.1~esm11.25.1-1ubuntu0.1~esm2
 None known
pypdf2
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
1.26.0-21.26.0-2ubuntu0.1~esm11.26.0-2ubuntu0.1~esm2
 None known
pypdf2
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.26.0-21.26.0-3ubuntu11.26.0-3ubuntu1.20.04.11.26.0-3ubuntu1.20.04.2
 None known
pypdf2
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.26.0-41.26.0-4ubuntu0.22.04.11.26.0-4ubuntu0.22.04.2
 None known
pypdf
Ubuntu:24.04:LTS
 All versions, plus listed versions
3.4.1-13.17.4-14.0.0-14.0.1-14.0.2-1
 None known
pypdf2
Ubuntu:24.04:LTS
 All versions, plus listed versions
2.12.1-32.12.1-4
 None known
pypdf
Ubuntu:25.10
 All versions, plus listed versions
4.3.1-15.4.0-1
 None known
pypdf
Ubuntu:26.10
 All versions, plus listed versions
6.9.2-16.9.2-2
 None known
pypdf
Ubuntu:26.04:LTS
 All versions, plus listed versions
5.4.0-16.9.2-1
 None known
python-pypdf
openSUSE:Tumbleweed
From an advisory covering 2 CVEs
 before 6.13.0-1.1
6.13.0-1.1

History

History
RecordedChangedSources
affected
affected, aliases, referencesOSV
factsOSV
affectedOSV
productsNVD
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-48155 is a medium vulnerability (CVSS 4.8) in Py-pdf Pypdf, published May 28, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.13%, the 2nd percentile. Fixed in pypdf 6.12.0.

References

Show 13 moreShow less
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Left out here: 110 versions. The JSON record has them.

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