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Vulnerability record · public intelligence
CVE-2026-13523
MEDIUM

GPAC ISOBMFF base_encoding.c data amplification

Published Jun 29, 2026 · Updated Nov 3, 2026

Severity · CVSSMEDIUM · Not scored
Known exploitationNot listed
EPSS / likelihood0.16%
QFinch risk scoreNot available

Original summary

Normalized public record · Updated Nov 3, 2026

GPAC ISOBMFF base_encoding.c data amplification

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

A weakness has been identified in GPAC up to 26.02.0. This affects an unknown part of the file src/utils/base_encoding.c of the component ISOBMFF Parser. Executing a manipulation can lead to highly compressed data. The attack needs to be launched locally. The exploit has been made available to the public and could be used for attacks. This patch is called 297f2d8d1f493d8b241330533cd47f7da758aeb3. A patch should be applied to remediate this issue. The vendor confirms: "We added a check on inflate output size, if it surpasses 32 times the input size we stop in error. This value could be adjusted later."

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

FIRST-EPSSCVE-LIST-V5
SSVC priority
LOW
Confidence
Not available
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. VDB-374531 | GPAC ISOBMFF base_encoding.c data amplification ↗
  2. VDB-374531 | CTI Indicators (IOB, IOC, IOA) ↗
  3. CVE-2026-13523 | CVE Analysis and Report ↗
  4. Submit #840159 | GPAC <= 26.02.0 Uncontrolled Resource Consumption ↗
  5. Source repository ↗
  6. Source repository ↗
  7. Patch commit ↗
  8. Source repository ↗

Record history

Published Jun 29, 2026 · Last refreshed Nov 3, 2026

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