Security readout for executives and security teams
Plain-English summary
CVE-2015-9252 is a denial-of-service issue in QPDF before 7.0.0. A crafted or problematic PDF can trigger endless recursion during token resolution, exhausting the stack and potentially crashing a process that uses QPDF.
Executive priority
Treat this as a service reliability risk for systems that process untrusted PDFs. Prioritize internet-facing upload and document workflows, but do not escalate as actively exploited based on the supplied evidence.
Technical view
The flaw is in QPDFTokenizer::resolveLiteral() in QPDFTokenizer.cc and relates to QPDF::resolve in QPDF.cc. The published description identifies endless recursion leading to stack exhaustion in QPDF versions before 7.0.0.
Likely exposure
Exposure is most likely where QPDF or software embedding QPDF processes untrusted PDF files, including upload pipelines, document conversion, validation, or backend automation. The bundle does not identify affected downstream products.
Exploitation context
The source bundle does not cite active exploitation, and the CVE is not marked KEV. Practical impact is denial of service through parser stack exhaustion, not documented code execution.
Researcher notes
Evidence is limited to the CVE description, QPDF issue, Ubuntu advisory, and a QPDF commit reference. No CVSS, CWE, affected CPEs, or exploit confirmation are supplied. Validate fix status through vendor package metadata, especially where fixes may be backported.
Mitigation direction
- Upgrade QPDF to 7.0.0 or later where available.
- Apply distribution vendor updates, including Ubuntu guidance where applicable.
- Identify applications or services that embed vulnerable QPDF libraries.
- Check vendor advisories for backported fixes in packaged versions.
Validation and detection
- Inventory installed QPDF versions across servers, containers, and build images.
- Confirm packages are 7.0.0 or include the referenced fix.
- Review PDF-processing services that accept external or customer-supplied files.
- Check Ubuntu systems against USN-3638-1 package guidance.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2015-9252 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/qpdf/qpdf/issues/51CVE reference · x_refsource_MISC
- USN-3638-1CVE reference · vendor-advisory, x_refsource_UBUNTU
- https://github.com/qpdf/qpdf/commit/701b518d5c56a1449825a3a37a716c58e05e1c3eCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.