Common Weakness Enumeration
CWE-409
AllowedImproper Handling of Highly Compressed Data (Data Amplification)
Abstraction: Base · Status: Incomplete
The product does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a large output.
221 vulnerabilities reference this CWE, most recent first.
CVE-2026-90555 (GCVE-0-2026-90555)
Vulnerability from cvelistv5 – Published: 2026-09-12 12:08 – Updated: 2026-09-12 12:08
VLAI
EPSS
VEX
Title
vLLM before 0.28.0 Denial of Service via Audio Header
Summary
vLLM versions before 0.28.0 fail to validate audio sample rate headers in the transcription endpoint, allowing authenticated clients to bypass duration checks. Attackers can submit forged FLAC headers with inflated sample rates to trigger excessive memory allocation and crash the API server process affecting all tenants.
Severity
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/vllm-project/vllm/security/adv… | vendor-advisory |
| https://www.vulncheck.com/advisories/vllm-before-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| vllm-project | vLLM |
Affected:
0 , < 0.28.0
(semver)
Unaffected: 0.28.0 (semver) cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:* |
Date Public
2026-08-28 00:00
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CVE-2026-89321 (GCVE-0-2026-89321)
Vulnerability from cvelistv5 – Published: 2026-09-14 08:13 – Updated: 2026-09-14 10:30
VLAI
EPSS
VEX
Summary
Publishing limits the compressed size of a VSIX (ovsx.publishing.max-content-size, 512 MB by default) but nothing limited how large an entry becomes when opened.
On the first request to /vscode/unpkg/{namespace}/{extension}/{version}/{path}, WebResourceService opened the entry with ZipFile.getInputStream() and passed the decompressed stream to Files.copy(), which ran to the end of the stream without counting bytes written. The result was cached under java.io.tmpdir, and that cache evicted by entry count (150), not by size, so it placed no bound on disk usage.
A publisher with access only to their own namespace could therefore upload a small, highly compressible VSIX and cause the server to write far larger files to the temp filesystem — repeating with different files or versions, since a repeat request is served from the cache.
Impact observed: the temp filesystem filled; requests for files not already cached returned 500 with No space left on device; a failed extraction left a partial cache file that blocked later attempts at that path; publishing failed with Failed to read extension file. Metadata and already-cached files kept working, and the server did not stop.
Triggering the extraction needs no authentication — only the upload does.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 10:30 UTC
CWE
- CWE-409 - Improper handling of highly compressed data (data amplification)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Eclipse Foundation | Eclipse OpenVSX |
Affected:
0.20.0 , < 1.2.0
(semver)
|
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CVE-2026-85786 (GCVE-0-2026-85786)
Vulnerability from cvelistv5 – Published: 2026-09-04 19:19 – Updated: 2026-09-04 19:27
VLAI
EPSS
VEX
Title
Incomplete fix for CVE-2026-75936 memory-amplification denial of service in Amazon ion-java
Summary
Improper handling of highly compressed data in Amazon ion-java before 1.12.1 might allow remote attackers to cause a denial of service via a crafted compressed Ion document that expands to an arbitrarily large size upon decompression due to insufficient coverage of the GZIP auto-decompression opt-out introduced for CVE-2026-75936.
To remediate this issue, users should upgrade to version 1.12.1.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 19:27 UTC
CWE
- CWE-409 - Improper handling of highly compressed data (data amplification)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/amazon-ion/ion-java/releases/t… | patchrelease-notes |
| https://aws.amazon.com/security/security-bulletin… | vendor-advisory |
Impacted products
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CVE-2026-84382 (GCVE-0-2026-84382)
Vulnerability from cvelistv5 – Published: 2026-09-02 18:03 – Updated: 2026-09-03 14:31
VLAI
EPSS
VEX
Title
HTTPX2: Streaming response decompression does not bound peak memory (decompression amplification)
Summary
HTTPX2 is a next generation HTTP client for Python. Prior to 2.12.0, the HTTPX2 content decoders in src/httpx2/httpx2/_decoders.py fully inflate each gzip, deflate, br, or zstd network chunk before iter_bytes() or aiter_bytes() yields bounded pieces to the application. A 64 KiB compressed chunk can expand to approximately 64 MiB in one intermediate allocation, so an attacker-controlled or compromised server can cause severe memory pressure or out-of-memory process termination even when the application streams the response. This issue is fixed in version 2.12.0.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 14:09 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/pydantic/httpx2/security/advis… | x_refsource_CONFIRM |
| https://github.com/pydantic/httpx2/pull/1126 | x_refsource_MISC |
| https://github.com/pydantic/httpx2/commit/4fd0c70… | x_refsource_MISC |
| https://github.com/pydantic/httpx2/releases/tag/v2.12.0 | x_refsource_MISC |
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CVE-2026-82864 (GCVE-0-2026-82864)
Vulnerability from cvelistv5 – Published: 2026-08-31 08:46 – Updated: 2026-08-31 18:51
VLAI
EPSS
VEX
Title
pdfme pdf-lib before 5.5.10 Denial of Service via Decompression Bomb
Summary
pdfme pdf-lib versions before 5.5.10 contain an unbounded buffer growth vulnerability in the DecodeStream.ensureBuffer() method that allows attackers to cause denial of service by supplying a crafted PDF with a FlateDecode stream containing a decompression bomb. Attackers can upload a small compressed PDF that decompresses to hundreds of megabytes, exhausting memory and crashing the Node.js process or freezing browser tabs during PDF parsing.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 16:23 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/pdfme/pdfme/security/advisorie… | vendor-advisory |
| https://www.vulncheck.com/advisories/pdfme-pdf-li… | third-party-advisory |
Impacted products
Date Public
2026-03-20 00:00
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CVE-2026-82520 (GCVE-0-2026-82520)
Vulnerability from cvelistv5 – Published: 2026-09-03 20:39 – Updated: 2026-09-04 18:36 X_Open Source
VLAI
EPSS
VEX
Title
parsedmarc < 11.0.1 Zip Bomb DoS via Compressed Email Attachments
Summary
parsedmarc before 11.0.1 decompresses gzip and ZIP attachments in a single unbounded read with no limit on decompressed output size. Because parsedmarc automatically processes incoming DMARC report emails without user interaction, an unauthenticated remote attacker can send a crafted email with a highly compressed attachment to the monitored mailbox, causing the parsedmarc process to allocate memory proportional to the uncompressed size and exhaust available RAM.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 18:35 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/domainaware/parsedmarc/securit… | vendor-advisory |
| https://github.com/domainaware/parsedmarc/release… | release-notespatch |
| https://www.vulncheck.com/advisories/parsedmarc-z… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| domainaware | parsedmarc |
Affected:
0 , < 11.0.1
(semver)
|
Date Public
2026-09-03 00:00
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CVE-2026-80189 (GCVE-0-2026-80189)
Vulnerability from cvelistv5 – Published: 2026-08-25 23:18 – Updated: 2026-08-29 11:48
VLAI
EPSS
VEX
Title
LeafWiki 0.10.0 through 0.12.0 Uncontrolled Resource Consumption via Unbounded ZIP Extraction
Summary
LeafWiki extracts an uploaded ZIP archive without limiting how much data it will write. ZipExtractor.ExtractToDir in internal/importer/zip_extractor.go opens each entry and copies it to the destination with io.Copy, which runs to the end of the decompressed stream, so only the size of the uploaded archive is bounded and the size it expands to is not. The import route that reaches this code requires the Editor or Admin role, and the upload itself is capped at 500 MiB compressed. Because a ZIP entry can compress at a very high ratio, an archive well inside that cap can expand to hundreds of gigabytes as it is written out. The extraction directory defaults to a location under the operating system temporary directory, so the written data consumes the disk backing that path, which on a tmpfs-backed temporary directory is memory. A user holding the Editor role can therefore exhaust the storage the service depends on and keep it from serving, using far more resource than the upload limit alone would permit.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 15:55 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/perber/leafwiki | product |
| https://github.com/perber/leafwiki/security/advis… | vendor-advisory |
| https://github.com/perber/leafwiki/blob/v0.12.0/i… | technical-description |
| https://github.com/perber/leafwiki/releases/tag/v0.12.1 | release-notes |
| https://www.vulncheck.com/advisories/leafwiki-0.1… | third-party-advisory |
Impacted products
Date Public
2026-08-24 00:00
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CVE-2026-79695 (GCVE-0-2026-79695)
Vulnerability from cvelistv5 – Published: 2026-09-09 11:31 – Updated: 2026-09-14 13:09
VLAI
EPSS
VEX
Summary
Dell SCG 5.0 Appliance versions prior to 5.36.00.16 and Dell SCG 5.0 Application versions prior to 5.36.00.00, contains an Improper Handling of Highly Compressed Data (Data Amplification) vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to denial of service.
Severity
7.3 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 13:09 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.dell.com/support/kbdoc/en-in/00050342… | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Dell | Secure Connect Gateway 5.0 - Application |
Affected:
0 , < 5.36.00.00 or later
(semver)
|
|
| Dell | Secure Connect Gateway 5.0 - Appliance |
Affected:
0 , < 5.36.00.16 or later
(semver)
|
Date Public
2026-08-31 06:30
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CVE-2026-78594 (GCVE-0-2026-78594)
Vulnerability from cvelistv5 – Published: 2026-09-02 14:43 – Updated: 2026-09-02 15:58
VLAI
EPSS
VEX
Title
Improper Handling of Highly Compressed Data in APM Server Leading to Persistent Denial of Service
Summary
Improper Handling of Highly Compressed Data (CWE-409) in APM Server can lead to a persistent denial of service via Excessive Allocation (CAPEC-130). An authenticated user with write access to source map content could store specially crafted, highly compressed content that exhausts the memory available to APM Server when it is later processed, terminating the process. The condition recurs on every restart until the stored content is removed.
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 15:44 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Elastic | Apm Server |
Affected:
8.0.0 , ≤ 8.19.19
(semver)
Affected: 9.0.0 , ≤ 9.4.4 (semver) Affected: 9.5.0 (semver) |
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CVE-2026-78206 (GCVE-0-2026-78206)
Vulnerability from cvelistv5 – Published: 2026-08-24 00:30 – Updated: 2026-08-29 11:47
VLAI
EPSS
VEX
Title
exceljs through 4.4.0 Uncontrolled Resource Consumption via Unbounded xlsx Decompression
Summary
exceljs through 4.4.0 decompresses all entries from supplied xlsx archives into memory without limits on entry size, total size, or compression ratio. Attackers can upload highly compressed workbooks that expand to gigabytes in memory, exhausting available resources and causing denial of service.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 18:09 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/exceljs/exceljs | product |
| https://github.com/mateocallec/exceljs-hardened/s… | third-party-advisory |
| https://github.com/exceljs/exceljs/blob/v4.4.0/li… | technical-description |
| https://www.vulncheck.com/advisories/exceljs-thro… | third-party-advisory |
Impacted products
Date Public
2026-08-23 00:00
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No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.