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CVE Record

CVE-2026-49127: Music Player Daemon < 0.24.11 Stack Buffer Overflow via pcm_unpack_24be

Music Player Daemon (MPD) before version 0.24.11 contains a stack buffer overflow vulnerability in the pcm_unpack_24be function in src/pcm/Pack.cxx that allows unauthenticated attackers to corrupt stack memory by triggering an off-by-one write in the PCM decoder plugin. Attackers can issue two MPD commands referencing a malicious HTTP audio source to cause the unpack loop to write 1366 entries into a 1365-entry buffer, overwriting four bytes past the array boundary with three attacker-controlled bytes from an HTTP response body, resulting in daemon termination or potential code execution.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

MPD versions before 0.24.11 can be crashed, and might permit code execution, when an unauthenticated attacker reaches the service and causes it to process specially crafted audio from an HTTP source. Successful attacks could disrupt audio services and compromise the account running MPD.

Executive priority

Treat this as a high-priority update, especially for remotely reachable MPD services. Schedule prompt remediation and investigate unexplained daemon crashes. Emergency response is warranted where untrusted users can issue MPD commands, although active exploitation is not established.

Technical view

An off-by-one error in pcm_unpack_24be writes 1366 entries into a 1365-entry stack buffer. The overwrite extends four bytes beyond the array and includes three attacker-controlled bytes. The documented consequence is daemon termination or potential code execution. CVSS 4.0 is 8.8.

Likely exposure

Exposure is highest where MPD before 0.24.11 accepts commands from untrusted networks and can retrieve attacker-influenced HTTP audio. Instances restricted to trusted clients have reduced reachability, but remain vulnerable until upgraded. The supplied evidence does not quantify deployed exposure.

Exploitation context

A public technical disclosure is referenced, increasing replication risk. However, the supplied data marks KEV false and provides no evidence of active exploitation. Potential code execution is documented, but reliable exploitation across platforms is not established by the bundle.

Researcher notes

The flaw is CWE-193 in src/pcm/Pack.cxx and affects the 24-bit big-endian PCM unpacking path. Assessment should focus on version, command-interface reachability, HTTP-source handling, crash evidence, and platform mitigations. Avoid interpreting daemon termination alone as proof of exploitation.

Mitigation direction

  • Upgrade MPD to version 0.24.11 or later using trusted vendor or distribution packages.
  • Prioritize internet-accessible or broadly reachable MPD instances.
  • Until upgraded, restrict MPD command access to trusted clients.
  • Prevent vulnerable instances from retrieving untrusted HTTP audio sources.

Validation and detection

  • Inventory MPD installations and record their exact versions.
  • Confirm every instance runs MPD 0.24.11 or later.
  • Review network controls to identify MPD access from untrusted hosts.
  • Check service logs for unexpected crashes or suspicious remote audio-source requests.
  • Verify upgraded packages contain the vendor correction associated with commit 59911028c020f84bc2e669da6a1ef88121301274.
Prepared
Confidence
high
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · low confidence lookup

CWE-193: 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.

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description · low confidence lookup

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.

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cve · low confidence lookup

CVE-2026-49127 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (4.0)
Known Exploited
No
Published

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N

Official CVE source material

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.

2CVSS vectors
3Timeline events
1ADP providers
8Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: pocAutomatable: yesTechnical Impact: partial

CVSS vector scores

2 official scores

We 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.

ScoreVersionSeverityVectorExploitImpactSource
8.8CVSS 4.0HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N——VulnCheck
8.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H3.94.7VulnCheck

Vulnerability scoring details

Base CVSS 4.0 score

8.8High
CVSS 4.0 vector shape for CVE-2026-49127Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MusicPlayerDaemonMPD0affected
Weakness

CWE details

CWE-193

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-193 · source CWE mapping

Off-by-one Error

Off-by-one Error represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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