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  4. CVE 2026 115585 pypdf possible long runtimes for repeated
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Back to active CVEs
High · CVSS 7.1CVE-2026-115585

pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)CVE-2026-115585

Answer in brief

CVE-2026-115585 records a High severity (CVSS 7.1) vulnerability in pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up). The current sources do not mark it as known exploited. The current feed maps py-pdf/pypdf (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 23, 2026Updated Oct 23, 2026Source checked Oct 23, 2026First seen by HOL Oct 23, 2026Material review Oct 23, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps py-pdf/pypdf (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
py-pdf/pypdfgeneric<6.21.26.21.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for py-pdf/pypdf.
  2. 2Review the reported fix. Update py-pdf/pypdf to 6.21.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 23, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • pypdf: Possible long runtimes for repeated references to the same missing objectSame py-pdf/pypdf package
  • pypdf: Possible long runtimes for large xref table header limitsSame py-pdf/pypdf package
  • Twisted: Denial of Service in the Twisted IMAP4 Server via a Negative Literal Size in SEARCHAlso CWE-400
  • Twisted: Unauthenticated Remote Denial of Service in the Twisted words domish XML Element Stream via an Unbounded Element TreeAlso CWE-400
  • Twisted: Unauthenticated Remote Denial of Service in the Twisted IRC Server via an Unbounded Line BufferAlso CWE-400
  • Twisted: Unauthenticated Remote Denial of Service in the Twisted conch Telnet Transport via an Unbounded Subnegotiation BufferAlso CWE-400

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-400, CWE-407
Source
CVE List V5
Source checked
Oct 23, 2026
References
4 linked sources
Open source record