CVE-2026-49460: pypdf is a free and open-source pure-python PDF library

Q: How do I fix CVE-2026-49460?

pypdf: upgrade to 6.12.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-49460 being exploited?

CVE-2026-49460 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-49460 affect?

CVE-2026-49460 affects pypdf. Severity is low (CVSS 3.3). pypdf is a free and open-source pure-python PDF library. Prior to 6.12.2, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /FlateDecode filter with a PNG p

Q: How urgent is CVE-2026-49460?

Priority 13/100. No elevated risk signals yet.

Routine

LOW 3.3UPGRADE

CVE-2026-49460 is a low-severity flaw (CVSS 3.3) affecting pypdf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.2, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /FlateDecode filter with a PNG predictor. This vulnerability is fixed in 6.12.2.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.3 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-407
Published	2026-06-22
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: pypdf project

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-22 21:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

pypdf project pypdf UPGRADE

Affected: < 6.12.2

Fixed in: 6.12.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pypdf || rpm -q pypdf || pypdf --version

2. UPGRADE to 6.12.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pypdf

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pypdf

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-49460?

pypdf: upgrade to 6.12.2. Exact commands for each OS are on this page.

Is CVE-2026-49460 being exploited?

CVE-2026-49460 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-49460 affect?

CVE-2026-49460 affects pypdf. Severity is low (CVSS 3.3). pypdf is a free and open-source pure-python PDF library. Prior to 6.12.2, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /FlateDecode filter with a PNG p

How urgent is CVE-2026-49460?

Priority 13/100. No elevated risk signals yet.

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-49461 MEDIUM 5.5 UPGRADE pypdf is a free and open-source pure-python PDF library
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CVE-2026-54531 MEDIUM 5.5 UPGRADE pypdf is a free and open-source pure-python PDF library
CVE-2026-54651 MEDIUM 5.5 UPGRADE pypdf is a free and open-source pure-python PDF library
CVE-2026-57204 MEDIUM 6.5 UPGRADE pypdf is a free and open-source pure-python PDF library

References

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