Common Weakness Enumeration
CWE-400
DiscouragedUncontrolled Resource Consumption
Abstraction: Class · Status: Draft
The product does not properly control the allocation and maintenance of a limited resource.
6376 vulnerabilities reference this CWE, most recent first.
CVE-2026-104861 (GCVE-0-2026-104861)
Vulnerability from cvelistv5 – Published: 2026-10-02 17:56 – Updated: 2026-10-02 18:20
VLAI
EPSS
VEX
Title
probe-image-size: Quadratic-time Denial of Service in the SVG Parser
Summary
probe-image-size gets image dimensions without downloading the entire file. Prior to 7.4.0, lib/parse_sync/svg.js and lib/parse_stream/svg.js use the searching regular expression /<[-_.:a-zA-Z0-9][^>]*>/, which repeatedly scans to the end of input when attacker-controlled data contains many less-than characters without a closing greater-than character. The synchronous parser converts and scans the full supplied buffer without an input cap, while the streaming parser reparses the complete accumulated SVG prefix for every received chunk. The probe.sync(), probe(stream), and probe(url) entry points can therefore block the Node.js event loop at full CPU, and attacker-controlled chunking can amplify the streaming cost. This issue is fixed in version 7.4.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 18:19 UTC
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/nodeca/probe-image-size/securi… | x_refsource_CONFIRM |
| https://github.com/nodeca/probe-image-size/commit… | x_refsource_MISC |
| https://github.com/nodeca/probe-image-size/commit… | x_refsource_MISC |
| https://github.com/nodeca/probe-image-size/commit… | x_refsource_MISC |
| https://github.com/nodeca/probe-image-size/releas… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| nodeca | probe-image-size |
Affected:
< 7.4.0
|
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CVE-2026-104844 (GCVE-0-2026-104844)
Vulnerability from cvelistv5 – Published: 2026-10-02 15:43 – Updated: 2026-10-02 16:16
VLAI
EPSS
VEX
Title
PostCSS: Quadratic complexity in flat selector parsing allows CPU exhaustion
Summary
PostCSS Selector Parser is a CSS selector parser that integrates with PostCSS but does not require it. Prior to 7.1.6, src/parser.js splitWord() can receive a flat selector as one word token carrying many class or ID indexes because period and hash characters are not tokenizer word delimiters. The uniqs() deduplication and per-index class and ID membership checks repeatedly scan the class and ID index arrays, while a separate Sass-interpolation filtering pass also performs repeated linear scanning. Together, these passes make parsing quadratic in the number of indexes and allow a crafted selector to occupy a synchronous parser thread. The maxNestingDepth guard does not mitigate the issue because the hostile selector can have zero nesting depth. Only consumers that synchronously parse untrusted selectors in an exposed request path are affected; ordinary build-time parsing of trusted sources is not affected. This issue is fixed in version 7.1.6.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 16:16 UTC
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/postcss/postcss-selector-parse… | x_refsource_CONFIRM |
| https://github.com/postcss/postcss-selector-parse… | x_refsource_MISC |
| https://github.com/postcss/postcss-selector-parse… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| postcss | postcss-selector-parser |
Affected:
< 7.1.6
|
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CVE-2026-103760 (GCVE-0-2026-103760)
Vulnerability from cvelistv5 – Published: 2026-10-01 22:53 – Updated: 2026-10-02 15:50
VLAI
EPSS
VEX
Title
Mooncake transfer engine through 0.3.13.post1 Denial of Service via P2P Handshake Daemon Response Write
Summary
Mooncake transfer engine through 0.3.13.post1 contains a denial of service vulnerability that allows unauthenticated remote attackers to block the handshake daemon by never reading replies. Attackers can send a Metadata request to the handshake RPC port and stall SocketHandShakePlugin's single listener thread in writeFully(), breaking all subsequent handshakes, metadata fetches, notify and probe requests.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 15:50 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/kvcache-ai/Mooncake/issues/4443 | issue-tracking |
| https://github.com/kvcache-ai/Mooncake/blob/71973… | technical-description |
| https://github.com/kvcache-ai/Mooncake | product |
| https://www.vulncheck.com/advisories/mooncake-tra… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| kvcache-ai | Mooncake |
Affected:
0 , ≤ 0.3.13.post1
(custom)
|
Date Public
2026-10-01 00:00
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CVE-2026-103000 (GCVE-0-2026-103000)
Vulnerability from cvelistv5 – Published: 2026-09-30 20:13 – Updated: 2026-09-30 20:49
VLAI
EPSS
VEX
Title
pypdf: Possible large memory usage when retrieving alphabetical page labels
Summary
pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause pypdf/_page_labels.py to generate strings beyond a reasonable page-label length when an application retrieves document page labels, consuming excessive memory and potentially making the application unavailable. This issue is fixed in version 6.19.0.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 20:49 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/py-pdf/pypdf/security/advisori… | x_refsource_CONFIRM |
| https://github.com/py-pdf/pypdf/pull/4096 | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/commit/0d8b5a8832… | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/releases/tag/6.19.0 | x_refsource_MISC |
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CVE-2026-102999 (GCVE-0-2026-102999)
Vulnerability from cvelistv5 – Published: 2026-09-30 20:10 – Updated: 2026-10-01 18:51
VLAI
EPSS
VEX
Title
pypdf: Possible long runtimes with large amount of embedded files
Summary
pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF containing many embedded files can cause the dictionary-based attachments API in pypdf/_doc_common.py to reparse the full attachment list for each content lookup, producing repeated work and long runtimes when an application accesses the embedded-file mapping. This issue is fixed in version 6.19.0.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-01 18:51 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/py-pdf/pypdf/security/advisori… | x_refsource_CONFIRM |
| https://github.com/py-pdf/pypdf/pull/4081 | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/commit/6b10556d13… | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/releases/tag/6.19.0 | x_refsource_MISC |
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CVE-2026-102998 (GCVE-0-2026-102998)
Vulnerability from cvelistv5 – Published: 2026-09-30 20:09 – Updated: 2026-09-30 20:49
VLAI
EPSS
VEX
Title
pypdf: Possible long runtimes when generating appearance streams
Summary
pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can cause pypdf/generic/_appearance_stream.py appearance-stream generation to repeat invariant selection-data work inside a loop when an application updates fields with flattening enabled, resulting in excessive runtimes and application unavailability. This issue is fixed in version 6.19.0.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 20:49 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/py-pdf/pypdf/security/advisori… | x_refsource_CONFIRM |
| https://github.com/py-pdf/pypdf/pull/4087 | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/commit/959467a9b9… | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/releases/tag/6.19.0 | x_refsource_MISC |
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CVE-2026-102997 (GCVE-0-2026-102997)
Vulnerability from cvelistv5 – Published: 2026-09-30 20:05 – Updated: 2026-10-02 16:33
VLAI
EPSS
VEX
Title
pypdf: Possible long runtimes for partially malformed FlateDecode streams (Follow-up)
Summary
pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF containing a partially malformed /FlateDecode stream with padded data can force pypdf/filters.py to use inefficient byte-by-byte decompression while the earlier recovery counter fails to advance for bytes that successfully decode, causing long runtimes and application unavailability. This is a residual issue after the malformed FlateDecode recovery fix. This issue is fixed in version 6.18.1.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 16:33 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/py-pdf/pypdf/security/advisori… | x_refsource_CONFIRM |
| https://github.com/py-pdf/pypdf/pull/4073 | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/commit/d9d38cf99b… | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/releases/tag/6.18.1 | x_refsource_MISC |
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CVE-2026-102996 (GCVE-0-2026-102996)
Vulnerability from cvelistv5 – Published: 2026-09-30 20:03 – Updated: 2026-09-30 20:48
VLAI
EPSS
VEX
Title
pypdf: Possible large memory usage when parsing font data
Summary
pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can provide a TrueType or Type1 simple font with an unusually large /Widths array, causing pypdf/_font.py Font._collect_tt_t1_character_widths to process entries beyond the 256 character codes meaningful for a simple font and consume excessive memory during operations such as text extraction. This issue is fixed in version 6.18.1.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 20:48 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/py-pdf/pypdf/security/advisori… | x_refsource_CONFIRM |
| https://github.com/py-pdf/pypdf/pull/4072 | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/commit/0fb26eb8cd… | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/releases/tag/6.18.1 | x_refsource_MISC |
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CVE-2026-102995 (GCVE-0-2026-102995)
Vulnerability from cvelistv5 – Published: 2026-09-30 20:01 – Updated: 2026-10-01 18:50
VLAI
EPSS
VEX
Title
pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)
Summary
pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can place unusually large source-code or destination-string tokens in a font /ToUnicode mapping, causing pypdf/_cmap.py parse_bfchar to decode and retain oversized values during operations such as text extraction and consume excessive memory. This is a second follow-up to earlier /ToUnicode resource-consumption fixes and is limited to the remaining token-length path. This issue is fixed in version 6.18.1.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-01 18:50 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/py-pdf/pypdf/security/advisori… | x_refsource_CONFIRM |
| https://github.com/py-pdf/pypdf/pull/4071 | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/commit/319d0b823c… | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/releases/tag/6.18.1 | x_refsource_MISC |
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CVE-2026-102994 (GCVE-0-2026-102994)
Vulnerability from cvelistv5 – Published: 2026-09-30 19:57 – Updated: 2026-09-30 20:50
VLAI
EPSS
VEX
Title
pypdf: Possible long runtimes/large memory usage when parsing indirect objects
Summary
pypdf is a free and open-source pure-python PDF library. Prior to 6.18.0, a crafted PDF containing indirect-object identifiers or generation-number tokens that continue for a long time without whitespace can cause pypdf/_reader.py and pypdf/generic/_base.py to scan excessive input through read_until_whitespace, resulting in long runtimes and application unavailability. This issue is fixed in version 6.18.0.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 20:50 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/py-pdf/pypdf/security/advisori… | x_refsource_CONFIRM |
| https://github.com/py-pdf/pypdf/pull/4055 | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/commit/82501d2993… | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/releases/tag/6.18.0 | x_refsource_MISC |
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Mitigation
Architecture and Design
Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended. A strong authentication and access control model will help prevent such attacks from occurring in the first place. The login application should be protected against DoS attacks as much as possible. Limiting the database access, perhaps by caching result sets, can help minimize the resources expended. To further limit the potential for a DoS attack, consider tracking the rate of requests received from users and blocking requests that exceed a defined rate threshold.
Mitigation
Architecture and Design
- Mitigation of resource exhaustion attacks requires that the target system either:
- The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
- The second solution is simply difficult to effectively institute -- and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.
- recognizes the attack and denies that user further access for a given amount of time, or
- uniformly throttles all requests in order to make it more difficult to consume resources more quickly than they can again be freed.
Mitigation
Architecture and Design
Ensure that protocols have specific limits of scale placed on them.
Mitigation
Implementation
Ensure that all failures in resource allocation place the system into a safe posture.
CAPEC-147: XML Ping of the Death
An attacker initiates a resource depletion attack where a large number of small XML messages are delivered at a sufficiently rapid rate to cause a denial of service or crash of the target. Transactions such as repetitive SOAP transactions can deplete resources faster than a simple flooding attack because of the additional resources used by the SOAP protocol and the resources necessary to process SOAP messages. The transactions used are immaterial as long as they cause resource utilization on the target. In other words, this is a normal flooding attack augmented by using messages that will require extra processing on the target.
CAPEC-227: Sustained Client Engagement
An adversary attempts to deny legitimate users access to a resource by continually engaging a specific resource in an attempt to keep the resource tied up as long as possible. The adversary's primary goal is not to crash or flood the target, which would alert defenders; rather it is to repeatedly perform actions or abuse algorithmic flaws such that a given resource is tied up and not available to a legitimate user. By carefully crafting a requests that keep the resource engaged through what is seemingly benign requests, legitimate users are limited or completely denied access to the resource.
CAPEC-492: Regular Expression Exponential Blowup
An adversary may execute an attack on a program that uses a poor Regular Expression(Regex) implementation by choosing input that results in an extreme situation for the Regex. A typical extreme situation operates at exponential time compared to the input size. This is due to most implementations using a Nondeterministic Finite Automaton(NFA) state machine to be built by the Regex algorithm since NFA allows backtracking and thus more complex regular expressions.