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.
146 vulnerabilities reference this CWE, most recent first.
CVE-2026-61455 (GCVE-0-2026-61455)
Vulnerability from cvelistv5 – Published: 2026-07-10 13:58 – Updated: 2026-07-10 14:49
VLAI
EPSS
VEX
Title
Grav before 2.0.1 Decompression Bomb via ZipArchiver
Summary
Grav before 2.0.1 contains a decompression bomb vulnerability in ZipArchiver::extract() that lacks limits on uncompressed size, file count, and nesting depth. Attackers can supply a crafted ZIP archive that expands to fill available disk space, causing denial of service by exhausting storage resources.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/getgrav/grav/security/advisori… | vendor-advisory |
| https://www.vulncheck.com/advisories/grav-before-… | third-party-advisory |
Impacted products
Date Public
2026-06-24 00:00
Credits
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CVE-2026-59939 (GCVE-0-2026-59939)
Vulnerability from cvelistv5 – Published: 2026-07-08 19:34 – Updated: 2026-07-10 14:55
VLAI
EPSS
VEX
Title
httplib2: Decompression Bomb Denial of Service via Unbounded gzip/deflate Response Handling
Summary
httplib2 is a comprehensive HTTP client library for Python. Prior to 0.32.0, httplib2 performs unbounded decompression of HTTP response bodies encoded with Content-Encoding: gzip or deflate in _decompressContent in httplib2/init.py, allowing a malicious or compromised HTTP server to return a small compressed payload that expands to an arbitrarily large size in memory and causes MemoryError or OOM-kill in the client process. This issue is fixed in version 0.32.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/httplib2/httplib2/security/adv… | x_refsource_CONFIRM |
| https://github.com/httplib2/httplib2/commit/87581… | x_refsource_MISC |
| https://github.com/httplib2/httplib2/releases/tag… | x_refsource_MISC |
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CVE-2026-59803 (GCVE-0-2026-59803)
Vulnerability from cvelistv5 – Published: 2026-07-08 19:42 – Updated: 2026-07-09 13:30 X_Open Source
VLAI
EPSS
VEX
Title
rpcx - Denial of Service via Gzip Decompression Bomb in Wire Protocol
Summary
rpcx through 1.9.3, fixed in commit 047aec1, contains a denial-of-service vulnerability in protocol.Message.Decode (protocol/message.go). When a message has the compression flag set, the payload is gzip-decompressed via util.Unzip with no limit on the decompressed output size. The only built-in size guard, protocol.MaxMessageLength, is checked against the compressed on-the-wire frame length, not the decompressed size, so it provides no protection. Because decoding (and decompression) occurs in readRequest before authentication, a single unauthenticated connection can send a small (under 2 MB) gzip-compressed message that expands to gigabytes of heap allocation, leading to out-of-memory conditions and service unavailability.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/smallnest/rpcx/issues/942 | technical-descriptionexploit |
| https://github.com/smallnest/rpcx/pull/943 | issue-tracking |
| https://github.com/smallnest/rpcx/commit/047aec18… | patch |
| https://www.vulncheck.com/advisories/rpcx-denial-… | third-party-advisory |
Impacted products
Date Public
2026-07-06 00:00
Credits
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CVE-2026-59193 (GCVE-0-2026-59193)
Vulnerability from cvelistv5 – Published: 2026-07-10 16:35 – Updated: 2026-07-10 19:04
VLAI
EPSS
VEX
Title
Grav CMS — Improper Handling of Highly Compressed Data in Installer::unZip()
Summary
Grav is a file-based Web platform. Prior to 2.0.0, an authenticated admin.super user can crash Grav or fill the disk by uploading a specially crafted ZIP archive through the Direct Install tool because Installer::unZip calls ZipArchive::extractTo without limits on uncompressed size, entry count, or directory depth. This issue is fixed in version 2.0.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/getgrav/grav/security/advisori… | x_refsource_CONFIRM |
| https://github.com/getgrav/grav/commit/23d6f2adf4… | x_refsource_MISC |
| https://github.com/getgrav/grav/releases/tag/2.0.0 | x_refsource_MISC |
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CVE-2026-58486 (GCVE-0-2026-58486)
Vulnerability from cvelistv5 – Published: 2026-07-13 22:12 – Updated: 2026-07-14 12:48
VLAI
EPSS
VEX
Title
HedgeDoc: Denial-of-service via YAML alias expansion in note frontmatter
Summary
HedgeDoc is an open source, real-time, collaborative, markdown notes application. Prior to version 1.11.0, HedgeDoc was vulnerable to a YAML alias bomb due to unsafe processing of the note frontmatter. HedgeDoc parsed frontmatter with js-yaml.load (js-yaml v3) via @hedgedoc/meta-marked, which resolved YAML anchor aliases. A compact malicious payload could therefore expand into a huge object structure, consuming excessive CPU. This expansion ran on every request to the publish view (/s/<shortid>) and, when placed under the opengraph key, the editor view (/<noteId>). A ten-level alias bomb could block the single Node.js event loop for roughly 235 seconds per request, causing concurrent requests to hang or drop and rendering the instance unavailable (DoS). Because the note was stored in the database, the impact survived process restarts until the note was removed. toobusy-js did not reliably mitigate the worst cases, as the event loop was saturated before the middleware could respond. This issue was fixed in version 1.11.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/hedgedoc/hedgedoc/security/adv… | x_refsource_CONFIRM |
| https://github.com/hedgedoc/hedgedoc/commit/c4894… | x_refsource_MISC |
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CVE-2026-55195 (GCVE-0-2026-55195)
Vulnerability from cvelistv5 – Published: 2026-07-08 20:30 – Updated: 2026-07-09 14:06
VLAI
EPSS
VEX
Title
py7zr: Decompression bomb (zip bomb) denial of service via unchecked extraction size
Summary
py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, py7zr's Worker.decompress() extracted archive entries without tracking total decompressed size, allowing a crafted .7z file such as a 15.6 KB archive that expands to 100 MB to exhaust disk or memory before extraction completes. This issue is fixed in version 1.1.3.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/miurahr/py7zr/security/advisor… | x_refsource_CONFIRM |
| https://github.com/miurahr/py7zr/commit/28faf107b… | x_refsource_MISC |
| https://github.com/miurahr/py7zr/releases/tag/v1.1.3 | x_refsource_MISC |
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CVE-2026-55078 (GCVE-0-2026-55078)
Vulnerability from cvelistv5 – Published: 2026-07-07 22:47 – Updated: 2026-07-08 13:55
VLAI
EPSS
VEX
Title
Coder: Zip upload decompression lacks aggregate size limit, enabling denial of service
Summary
Coder allows organizations to provision remote development environments via Terraform. Starting in version 2.17.0 and prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, `POST /api/v2/files` converts zip uploads to tar in memory via `CreateTarFromZip`, which enforced a per-entry size limit but no aggregate limit on total decompressed output, writing to an unbounded in-memory buffer. Exploitation requires authenticated file-upload access and the impact is limited to availability (denial of service). The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 adds a metadata preflight check that sums projected entry sizes and a streaming writer that enforces the aggregate limit during decompression. As a workaround, restrict file-upload permissions to trusted users or place a reverse proxy with request-body size limits in front of `coderd`.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/coder/coder/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/coder/coder/pull/25877 | x_refsource_MISC |
| https://github.com/coder/coder/releases/tag/v2.29.17 | x_refsource_MISC |
| https://github.com/coder/coder/releases/tag/v2.32.7 | x_refsource_MISC |
| https://github.com/coder/coder/releases/tag/v2.33.8 | x_refsource_MISC |
| https://github.com/coder/coder/releases/tag/v2.34.2 | x_refsource_MISC |
Impacted products
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CVE-2026-54314 (GCVE-0-2026-54314)
Vulnerability from cvelistv5 – Published: 2026-06-23 15:33 – Updated: 2026-06-24 13:56
VLAI
EPSS
VEX
Title
n8n: Denial of Service via ZIP decompression in webhook workflow
Summary
n8n is an open source workflow automation platform. Prior to 2.24.0, the Compression node's Decompress operation expanded attacker-controlled archives into memory without enforcing limits on decompressed output size. An unauthenticated attacker could send a small compressed archive to a public webhook workflow using this node, causing the n8n process to terminate due to memory exhaustion and disrupting all workflows in the same instance. This vulnerability is fixed in 2.24.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/n8n-io/n8n/security/advisories… | x_refsource_CONFIRM |
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CVE-2026-54278 (GCVE-0-2026-54278)
Vulnerability from cvelistv5 – Published: 2026-06-22 16:38 – Updated: 2026-06-23 16:10
VLAI
EPSS
VEX
Title
AIOHTTP: Unread Compressed Request Bodies Bypass client_max_size During Cleanup
Summary
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, during cleanup it is possible for a compressed request body to be decompressed into memory in one chunk. An attacker may be able to send a compressed payload in specific situations that could be decompressed into memory, potentially leading to DoS (a zip bomb edge case). This vulnerability is fixed in 3.14.1.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/aio-libs/aiohttp/security/advi… | x_refsource_CONFIRM |
| https://github.com/aio-libs/aiohttp/commit/4f7480… | x_refsource_MISC |
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CVE-2026-54233 (GCVE-0-2026-54233)
Vulnerability from cvelistv5 – Published: 2026-06-22 22:10 – Updated: 2026-06-23 12:15
VLAI
EPSS
VEX
Title
vLLM: OOM Denial of Service via Audio Decompression Bomb
Summary
vLLM is an inference and serving engine for large language models (LLMs). Prior to 0.23.1rc0, vLLM's /v1/audio/transcriptions endpoint limits compressed upload size but not decoded PCM output. A 25MB OPUS file expands to ~14.9GB of float32 PCM at decode time. This vulnerability is fixed in 0.23.1rc0.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
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… | x_refsource_CONFIRM |
| https://github.com/vllm-project/vllm/pull/44970 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| vllm-project | vllm |
Affected:
< 0.23.1rc0
|
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No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.