Security readout for executives and security teams
Plain-English summary
A flaw in dr_libs dr_flac.h can make software consume excessive memory while reading crafted FLAC picture metadata. The expected business impact is denial of service, not data theft or code execution, based on the provided sources.
Executive priority
Treat as a targeted availability risk. Patch in normal vulnerability cycles, faster for internet-facing or automated media-processing systems that accept untrusted FLAC content.
Technical view
dr_flac.h 0.13.3 and earlier allocate memory from attacker-controlled PICTURE metadata mimeLength and descriptionLength values in drflac__read_and_decode_metadata(). Systems are exposed when applications process crafted FLAC streams with metadata callbacks enabled.
Likely exposure
Exposure is most likely in applications that vendor dr_libs dr_flac.h and process user-supplied FLAC files or streams, especially media ingestion, audio tooling, and server-side metadata processing.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. The described outcome is memory exhaustion denial of service through malformed FLAC PICTURE metadata, requiring the vulnerable parser to process attacker-controlled input.
Researcher notes
Evidence supports CWE-789 uncontrolled memory allocation in PICTURE metadata parsing. The provided version data is limited to 0.13.3 and earlier plus three fixing commits; no broader product impact is established.
Mitigation direction
- Update dr_flac.h beyond 0.13.3 using the listed upstream patch commits.
- Replace vendored copies of dr_flac.h in downstream products and builds.
- Prioritize systems processing untrusted FLAC files, uploads, or streams.
- Review vendor guidance before local backports or behavioral workarounds.
Validation and detection
- Inventory products and repositories containing dr_libs dr_flac.h.
- Confirm whether the embedded header is 0.13.3 or earlier.
- Check whether FLAC metadata callbacks are used on untrusted input.
- Verify patched builds include commits fefced4, 4f5a4cd, and 663239a.
- Run regression tests for normal FLAC metadata handling after updating.
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.
CWE-789: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-32836 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
- Medium
- CVSS
- 6.9 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H2.53.6VulnCheckVulnerability scoring details
Base CVSS 4.0 score
6.9MediumVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
6.2MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/mackron/dr_libs/issues/298CVE reference, VulnCheck · issue-tracking
- https://github.com/mackron/dr_libs/commit/fefced4a64adfb1a68a2d31d882366e56096dee8CVE reference, VulnCheck · patch
- https://github.com/mackron/dr_libs/commit/4f5a4cd3b57564d969443c580c75857e039f100aCVE reference, VulnCheck · patch
- https://github.com/mackron/dr_libs/commit/663239a3d0460c33bd5b6e5166edcb404e3df676CVE reference, VulnCheck · patch
- https://www.vulncheck.com/advisories/mackron-dr-libs-excessive-memory-allocation-in-picture-metadata-parsingCVE reference, VulnCheck · third-party-advisory
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.
Memory Allocation with Excessive Size Value
Memory Allocation with Excessive Size Value represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.