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.
194 vulnerabilities reference this CWE, most recent first.
CVE-2026-61449 (GCVE-0-2026-61449)
Vulnerability from cvelistv5 – Published: 2026-07-15 11:25 – Updated: 2026-07-15 17:52
VLAI
EPSS
VEX
Title
Grav before 2.0.2 Decompression Bomb via Forged ZIP Size
Summary
Grav 2.0.1 contains a decompression-bomb size-cap bypass in ZipArchiver and GPM\Installer. The size bound introduced in 2.0.1 sums the uncompressed size declared in each entry's ZIP central-directory header (ZipArchive::statIndex()['size']) and rejects archives exceeding system.gpm.archive.max_uncompressed_size before extraction. Because this declared size is attacker-forgeable and is not cross-checked against the actual inflated stream, a crafted archive declaring tiny per-entry sizes passes the cap while extractTo() writes the real, much larger content, filling disk or exhausting inodes. The archive must be supplied by a package source or admin upload (admin/operator trust). Fixed in 2.0.2. This is an incomplete fix for GHSA-928x-9mpw-8h56.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 17:49 UTC
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
2026-06-25 00:00
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CVE-2026-59939 (GCVE-0-2026-59939)
Vulnerability from cvelistv5 – Published: 2026-07-08 19:34 – Updated: 2026-08-20 21:08
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-10 14:55 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
4 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 |
| https://lists.debian.org/debian-lts-announce/2026… |
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CVE-2026-59932 (GCVE-0-2026-59932)
Vulnerability from cvelistv5 – Published: 2026-07-28 17:59 – Updated: 2026-07-29 13:56
VLAI
EPSS
VEX
Title
PhpSpreadsheet: Gnumeric reader unbounded gzip expansion causes memory exhaustion
Summary
PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. In versions 4.0.0 through 5.8.0, 3.3.0 through 3.10.6, 2.2.0 through 2.4.6, 2.0.0 through 2.1.17, and all releases up to and including 1.30.5, the Gnumeric reader reads attacker-supplied .gnumeric files into memory and, when the file starts with gzip magic bytes, calls gzdecode() on the full compressed contents without enforcing a decompressed-size limit. A very small compressed .gnumeric file can expand to data larger than the PHP memory limit and crash the process during Gnumeric::canRead() before the file is rejected or fully parsed. This is reachable through normal file-type detection and Gnumeric loading paths, so applications that accept attacker-controlled spreadsheet uploads can suffer denial of service. This issue has been fixed in versions 5.8.1, 3.10.7, 2.4.7, 2.1.18 and 1.30.6.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-29 13:56 UTC
CWE
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/PHPOffice/PhpSpreadsheet/secur… | x_refsource_CONFIRM |
| https://github.com/PHPOffice/PhpSpreadsheet/commi… | x_refsource_MISC |
| https://github.com/PHPOffice/PhpSpreadsheet/relea… | x_refsource_MISC |
| https://github.com/PHPOffice/PhpSpreadsheet/relea… | x_refsource_MISC |
| https://github.com/PHPOffice/PhpSpreadsheet/relea… | x_refsource_MISC |
| https://github.com/PHPOffice/PhpSpreadsheet/relea… | x_refsource_MISC |
| https://github.com/PHPOffice/PhpSpreadsheet/relea… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| PHPOffice | PhpSpreadsheet |
Affected:
>= 4.0.0, < 5.8.1
Affected: >= 3.3.0, < 3.10.7 Affected: >= 2.2.0, < 2.4.7 Affected: >= 2.0.0, < 2.1.18 Affected: < 1.30.6 |
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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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-09 13:29 UTC
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
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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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-10 19:04 UTC
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-14 12:48 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/hedgedoc/hedgedoc/security/adv… | x_refsource_CONFIRM |
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CVE-2026-58107 (GCVE-0-2026-58107)
Vulnerability from cvelistv5 – Published: 2026-08-28 12:57 – Updated: 2026-08-28 18:26
VLAI
EPSS
VEX
Title
Authenticated Remote Denial of Service via Unbounded zlib Decompression in massStoreRun
Summary
CodeChecker's massStoreRun processing path performs one-shot decompression of attacker-controlled, Base64-encoded zlib data without enforcing a maximum decompressed size.
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Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 18:25 UTC
CWE
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Ericsson | CodeChecker |
Affected:
0 , < 6.28.3
(python)
|
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CVE-2026-55497 (GCVE-0-2026-55497)
Vulnerability from cvelistv5 – Published: 2026-07-31 03:28 – Updated: 2026-07-31 15:58
VLAI
EPSS
VEX
Title
Cloudreve: Server crash through image decompression/pixel bomb in thumbnail & avatar decoding (DoS)
Summary
Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, the built-in thumbnail and avatar image decoders limit compressed file size but do not limit decoded pixel dimensions, allowing an authenticated user to submit a small PNG, JPEG, or GIF that triggers an unbounded allocation and terminates the Cloudreve process through fatal out-of-memory behavior. This issue is fixed in version 4.17.0.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-31 15:57 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/cloudreve/cloudreve/security/a… | x_refsource_CONFIRM |
| https://github.com/cloudreve/cloudreve/commit/360… | x_refsource_MISC |
| https://github.com/cloudreve/cloudreve/releases/t… | 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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-09 14:05 UTC
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 13:54 UTC
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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No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.