CVE-2026-24688

MEDIUMNVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 68% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

pypdf is a free and open-source pure-python PDF library. An attacker who uses an infinite loop vulnerability that is present in versions prior to 6.6.2 can craft a PDF which leads to an infinite loop. This requires accessing the outlines/bookmarks. This has been fixed in pypdf 6.6.2. If projects cannot upgrade yet, consider applying the changes from PR #3610 manually.

CVSS v3
4.3
EG Score
4.3(medium)
EG Risk
20(Track)
EG Risk 20/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

January 27, 2026

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated Aug 9, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available

Possible infinite loop when processing outlines/bookmarks · Advisory · py-pdf/pypdf · GitHub

https://github.com/py-pdf/pypdf/security/advisories/GHSA-2q4j-m29v-hq73
github_release Patch Available

Version 6.6.2, 2026-01-26

Patch available: py-pdf/pypdf 6.6.2

https://github.com/py-pdf/pypdf/releases/tag/6.6.2
github_pr Patch Available

SEC: Detect cyclic references when retrieving outlines

Patch available: py-pdf/pypdf 6.6.2 (PR #3610 merged 2026-01-26)

https://github.com/py-pdf/pypdf/pull/3610
github_commit Patch Available

commit b1282f8dcdc1 (py-pdf/pypdf)

Patch available: py-pdf/pypdf 6.6.2 (contains commit b1282f8dcdc1)

https://github.com/py-pdf/pypdf/commit/b1282f8dcdc1a7b41ceab6740ffddfdf31b1fec1

Affected Packages

(6 across 5 ecosystems)
Debian:12(2)
PackageVulnerable rangeFixed inDependents
pypdf3.17.4-1 ... 6.9.2-2 (14 versions)——
pypdf22.12.1-3, 2.12.1-3+deb12u1, 2.12.1-4——
Debian:11(1)
PackageVulnerable rangeFixed inDependents
pypdf21.26.0-4 ... 2.9.0-1 (24 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
pypdf5.4.0-1, 6.9.0-1, 6.9.2-1, 6.9.2-2——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
pypdf5.4.0-16.9.0-1—
PyPI(1)
PackageVulnerable rangeFixed inDependents
pypdf1.0 ... 6.6.1 (87 versions)6.6.2—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 26× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 160 total refreshes for this CVE.

  1. 2026-09-19 00:06 UTCOSV refresh
  2. 2026-09-18 19:27 UTCEPSS rescore
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  1. 2026-08-20 22:55 UTCEPSS rescore
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  26. 2026-07-31 06:12 UTCOSV refresh
  27. 2026-07-30 16:27 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-24688?
CVE-2026-24688 is a medium vulnerability published on January 27, 2026. pypdf is a free and open-source pure-python PDF library. An attacker who uses an infinite loop vulnerability that is present in versions prior to 6.6.2 can craft a PDF which leads to an infinite loop. This requires accessing the outlines/bookmarks. This has been fixed in pypdf 6.6.2. If projects…
When was CVE-2026-24688 disclosed?
CVE-2026-24688 was first published in the National Vulnerability Database on January 27, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-24688 actively exploited?
CVE-2026-24688 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 64.9% of all scored CVEs.
What is the CVSS score of CVE-2026-24688?
CVE-2026-24688 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-24688?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-24688, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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