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GPAC EUVDEUVD-2026-40020

| CVE-2026-13523 LOW
Improper Handling of Highly Compressed Data (Data Amplification) (CWE-409)
2026-06-29 VulDB GHSA-c4wq-769x-vwcv
Information Disclosure Gpac
1.9
CVSS 4.0 · Vendor: VulDB

Severity by source

Vendor (VulDB) PRIMARY
1.9 MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
3.3 LOW

Local vector with low-privilege input required; impact is limited to availability via resource exhaustion, with no confidentiality or integrity effects confirmed.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
Severity Changed
Jun 29, 2026 - 03:22 NVD
MEDIUM LOW
CVSS changed
Jun 29, 2026 - 03:22 NVD
4.8 (MEDIUM) 1.9 (LOW)
Source Code Evidence Fetched
Jun 29, 2026 - 02:46 vuln.today
Analysis Generated
Jun 29, 2026 - 02:46 vuln.today

DescriptionCVE.org

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."

AnalysisAI

Unbounded zlib decompression in GPAC up to version 26.02.0 allows a local low-privileged attacker to cause resource exhaustion via a crafted highly-compressed (zip-bomb) payload processed by the ISOBMFF parser and associated filter modules. The affected function gf_gz_decompress_payload_ex() in src/utils/base_encoding.c applies no ceiling on inflated output size, enabling disproportionate memory or CPU consumption. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain local low-privilege system access
Delivery
Craft malicious zip-bomb compressed media payload
Exploit
Submit payload to GPAC media processing pipeline
Execution
Trigger unbounded zlib inflate in gf_gz_decompress_payload_ex
Persist
Exhaust process memory or CPU
Impact
GPAC process crash or host slowdown
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Vulnerability AssessmentAI

Exploitation The attacker must have local access to the system and low-privilege credentials sufficient to invoke GPAC directly or supply input to a GPAC-based media processing workflow. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 4.8 (medium) is well-calibrated for this vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A local user with standard system credentials crafts a zip-bomb compressed payload and feeds it to a GPAC media processing pipeline - for example, via an MP4 mux, SVG import, or NHML demux workflow that internally calls the zlib inflate routines. Without the output size cap, the inflated data grows far beyond 32x the input size, driving memory allocation and CPU usage until the GPAC process is terminated by the OS or the host becomes unresponsive. …
Remediation Apply the upstream patch available at commit 297f2d8d1f493d8b241330533cd47f7da758aeb3 (https://github.com/gpac/gpac/commit/297f2d8d1f493d8b241330533cd47f7da758aeb3) via PR #3589 (https://github.com/gpac/gpac/pull/3589). … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-40020 vulnerability details – vuln.today
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