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.
296 vulnerabilities reference this CWE, most recent first.
CVE-2026-92000 (GCVE-0-2026-92000)
Vulnerability from cvelistv5 – Published: 2026-09-15 20:56 – Updated: 2026-09-24 14:22
VLAI
EPSS
VEX
Title
adm-zip 0.5.14 through 0.6.0 Denial of Service via Zero Declared Uncompressed Size
Summary
adm-zip versions 0.5.14 through 0.6.0 fail to apply zlib decompression output limits when ZIP entries declare zero uncompressed size. Attackers can craft malicious ZIP archives with highly compressible entries declaring zero size to exhaust memory and cause denial of service.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 19:15 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/cthackers/adm-zip/security/adv… | vendor-advisory |
| https://github.com/cthackers/adm-zip/commit/49160… | patch |
| https://github.com/cthackers/adm-zip/commit/8bc41… | technical-descriptionpatch |
| https://github.com/cthackers/adm-zip/blob/v0.6.0/… | technical-description |
| https://github.com/cthackers/adm-zip | product |
| https://www.vulncheck.com/advisories/adm-zip-0.5.… | third-party-advisory |
Impacted products
Date Public
2026-09-11 00:00
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CVE-2026-90555 (GCVE-0-2026-90555)
Vulnerability from cvelistv5 – Published: 2026-09-12 12:08 – Updated: 2026-09-14 16:00
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
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 16:00 UTC
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-2026-89059 (GCVE-0-2026-89059)
Vulnerability from cvelistv5 – Published: 2026-09-18 07:13 – Updated: 2026-10-15 23:11
VLAI
EPSS
VEX
Title
Resteasy-core: resteasy: iioimageprovider unbounded image decode (decompression-bomb dos)
Summary
A flaw was found in RESTEasy's IIOImageProvider, which decodes attacker-supplied image request bodies without enforcing any limit on the declared image dimensions or pixel count. A remote, unauthenticated attacker can send a small crafted image declaring enormous dimensions to trigger a very large memory allocation, exhausting the JVM heap and resulting in a denial of service.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 15:13 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:83082 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:83520 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-89059 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2519756 | issue-trackingx_refsource_REDHAT |
| https://github.com/resteasy/resteasy/commit/7c7e6… | |
| https://github.com/resteasy/resteasy/security/adv… |
Impacted products
18 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat |
Affected:
0 , < 6.2.19.Final
(maven)
Affected: 7.0.0.Alpha1 , < 7.0.5.Final (maven) |
||
| Red Hat | Red Hat build of Quarkus 3.27.6.redhat |
Unaffected:
6.2.19.Final-redhat-00003 , < *
(rpm)
cpe:/a:redhat:quarkus:3.27::el8 |
|
| Red Hat | Red Hat build of Quarkus 3.33.4.redhat |
Unaffected:
6.2.19.Final-redhat-00003 , < *
(rpm)
cpe:/a:redhat:quarkus:3.33::el8 |
|
| Red Hat | Red Hat build of Apache Camel 4 for Quarkus 3 |
cpe:/a:redhat:camel_quarkus:3
|
|
| Red Hat | Red Hat build of Apicurio Registry 3 |
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Date Public
2026-09-17 14:00
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CVE-2026-86104 (GCVE-0-2026-86104)
Vulnerability from cvelistv5 – Published: 2026-09-29 23:05 – Updated: 2026-09-30 15:28
VLAI
EPSS
VEX
Title
Fireware OS Resource Exhaustion in Login Process Allows Denial of Service
Summary
An uncontrolled resource consumption vulnerability in the Fireware OS login process (wgagent) allows a remote, unauthenticated attacker to cause a denial of service by sending a specially crafted request.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 14:22 UTC
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://psirt.watchguard.com/CVE-2026-86104 | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| WatchGuard | Fireware OS |
Affected:
2026.3 , < 2026.3.2
(custom)
Affected: 2025.0 , < 2026.2.3 (custom) Affected: 12.0 , < 12.12.3 (custom) |
|
| WatchGuard | Fireware OS |
Affected:
12.0 , < 12.5.21
(custom)
|
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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 |
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CVE-2026-85721 (GCVE-0-2026-85721)
Vulnerability from cvelistv5 – Published: 2026-09-17 15:55 – Updated: 2026-09-17 17:22
VLAI
EPSS
VEX
Title
AsyncHttpClient: Unbounded HTTP/1.1 response decompression enables a decompression-bomb denial of service
Summary
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 2.0.0 until 2.16.1 and 3.0.12, automatic response decompression on the HTTP/1.1 path uses ChannelManager.newHttpContentDecompressor() to install Http1ContentDecompressor without a cumulative output-size limit. A hostile or compromised server, or an attacker who can alter a response in transit, can send a small gzip, deflate, or snappy response that expands across chunks until the client exhausts its heap and raises OutOfMemoryError; brotli and zstd are also affected when their optional codecs are present. In versions 3.0.8 through 3.0.10, the HTTP/2 decompressor is also unbounded, so switching protocols does not mitigate the issue on those releases. A limit applied to each decode call is insufficient because the response can be delivered as many small chunks, so the fixed implementation tracks total decompressed bytes for the whole response. This issue is fixed in versions 2.16.1 and 3.0.12.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 17:22 UTC
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/AsyncHttpClient/async-http-cli… | x_refsource_CONFIRM |
| https://github.com/AsyncHttpClient/async-http-cli… | x_refsource_MISC |
| https://github.com/AsyncHttpClient/async-http-cli… | x_refsource_MISC |
| https://github.com/AsyncHttpClient/async-http-cli… | x_refsource_MISC |
| https://github.com/AsyncHttpClient/async-http-cli… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| AsyncHttpClient | async-http-client |
Affected:
>= 2.0.0, < 2.16.1
Affected: >= 3.0.0, < 3.0.12 |
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CVE-2026-84384 (GCVE-0-2026-84384)
Vulnerability from cvelistv5 – Published: 2026-09-18 15:58 – Updated: 2026-09-18 17:30
VLAI
EPSS
VEX
Title
libheif: brotli/zlib decompression paths lack output-size limits, allowing decompression-bomb OOM/DoS
Summary
libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.2, crafted HEIF or AVIF mime metadata and unci image data can cause decompress_brotli() and do_inflate() to grow accumulated output without an effective size limit or MemoryHandle accounting. The brotli path has no output bound, while the zlib path checks only a small temporary buffer in a branch that valid streams do not reach, and overlapping icef units can decompress the same payload repeatedly. HeifContext::interpret_heif_file_images() processes multiple compressed metadata items during file opening, allowing a small file to consume unbounded memory and terminate the process. This issue is fixed in version 1.23.2.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 17:30 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/strukturag/libheif/security/ad… | x_refsource_CONFIRM |
| https://github.com/strukturag/libheif/commit/2189… | x_refsource_MISC |
| https://github.com/strukturag/libheif/releases/ta… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| strukturag | libheif |
Affected:
>= 1.19.0, < 1.23.2
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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-2026-83599 (GCVE-0-2026-83599)
Vulnerability from cvelistv5 – Published: 2026-09-22 16:54 – Updated: 2026-09-22 17:43
VLAI
EPSS
VEX
Title
Netdata: WebSocket Decompression Bomb
Summary
Netdata is an open source observability tool. Prior to 2.11.0, Netdata's unauthenticated WebSocket server negotiates permessage-deflate before authentication, and src/web/websocket/websocket-compression.c allows websocket_client_decompress_message() to grow decompressed output toward WS_MAX_DECOMPRESSED_SIZE without enforcing a compressed-to-decompressed ratio. Small highly compressed frames can therefore cause large server-side allocations, and repeated concurrent connections can exhaust memory and terminate monitoring. This vulnerability is fixed in 2.11.0.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 17:36 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/netdata/netdata/security/advis… | x_refsource_CONFIRM |
| https://github.com/netdata/netdata/pull/22828 | x_refsource_MISC |
| https://github.com/netdata/netdata/commit/e3811f7… | x_refsource_MISC |
| https://github.com/netdata/netdata/releases/tag/v2.11.0 | x_refsource_MISC |
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No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.