Security readout for executives and security teams
Plain-English summary
YARA 3.11.0 can crash when inspecting a maliciously malformed Mach-O file. Because YARA is commonly used in security scanning pipelines, the business risk is interruption of analysis services and, per the CVE text, possible code execution. The bundle does not provide a CVSS score or confirmed exploitation.
Executive priority
Treat this as a targeted security tooling reliability risk. It is not KEV-listed and has incomplete scoring data, but vulnerable scanners handling untrusted files could crash and disrupt detection workflows. Prioritize remediation in internet-facing or high-volume analysis pipelines.
Technical view
In macho_parse_file in YARA 3.11.0's macho/macho.c, command_size can be inconsistent with the real size. A crafted Mach-O file can trigger out-of-bounds memory access, causing denial of service or potential code execution. The bundle does not provide CVSS, CWE, CPEs, or exact fixed versions.
Likely exposure
Exposure is most likely where YARA 3.11.0 processes untrusted Mach-O files, such as malware analysis, file-upload scanning, CI security checks, or endpoint/security tooling. The bundle only names YARA 3.11.0, so do not assume other versions without vendor confirmation.
Exploitation context
The CVE is not marked as CISA KEV, and the supplied sources do not claim active exploitation. Exploitation would require a crafted Mach-O file to be parsed by the vulnerable YARA functionality. The public bundle does not include exploit maturity, prerequisites, or proof-of-concept status.
Researcher notes
Key gaps are missing CVSS, CWE, CPE data, and exact fixed-version details in the supplied bundle. The strongest technical signal is the YARA Mach-O parser description. Validate exposure by version and file-processing path rather than broad product assumptions.
Mitigation direction
- Inventory YARA deployments and identify any running version 3.11.0.
- Review upstream YARA and Fedora advisories for fixed package guidance.
- Prioritize updates where YARA parses untrusted Mach-O files.
- Limit untrusted Mach-O processing until vendor guidance is applied.
- Monitor vendor channels for exact fixed-version confirmation.
Validation and detection
- Confirm installed YARA versions across scanning hosts and containers.
- Identify workflows that parse Mach-O files from external sources.
- Check package manager history against Fedora or upstream YARA advisories.
- Verify scanning services remain stable after applying vendor updates.
- Document any remaining YARA 3.11.0 exceptions and compensating controls.
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.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-19648 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/VirusTotal/yara/issues/1178CVE reference · x_refsource_MISC
- FEDORA-2021-f41d5fc954CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-dd62918333CVE reference · vendor-advisory, x_refsource_FEDORA
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.