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4 vulnerabilities by collective
CVE-2026-77399 (GCVE-0-2026-77399)
Vulnerability from nvd – Published: 2026-09-22 18:58 – Updated: 2026-09-23 14:36
VLAI
EPSS
VEX
Title
icalendar: Denial of service via unbounded VALARM REPEAT expansion
Summary
icalendar is an RFC 5545 compatible parser and generator of iCalendar files for Python. From 6.1.0 until 7.2.2, vInt.from_ical accepts an attacker-controlled VALARM REPEAT value and applications that request alarm times can eagerly expand it without an application-level limit. Alarms.times and Alarms.active reach the unbounded expansion in versions starting with 6.1.0, while Alarm.triggers adds a second affected path starting with 7.0.0. Parsing alone does not trigger the issue, but accessing these properties can consume excessive CPU time and heap memory and terminate or stall a service. This issue is fixed in version 7.2.2.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 14:10 UTC
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/collective/icalendar/security/… | x_refsource_CONFIRM |
| https://github.com/collective/icalendar/pull/1571 | x_refsource_MISC |
| https://github.com/collective/icalendar/commit/15… | x_refsource_MISC |
| https://github.com/collective/icalendar/commit/cd… | x_refsource_MISC |
| https://github.com/collective/icalendar/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| collective | icalendar |
Affected:
>= 6.1.0, < 7.2.2
|
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CVE-2026-55099 (GCVE-0-2026-55099)
Vulnerability from nvd – Published: 2026-08-25 19:27 – Updated: 2026-08-26 15:05
VLAI
EPSS
VEX
Title
icalendar: Algorithmic Complexity in Equality
Summary
icalendar is an RFC 5545 compatible parser and generator of iCalendar files for Python. From 7.1.0 until 7.1.3, the Component equality method in src/icalendar/cal/component.py compares nested subcomponents with two membership loops, and each membership test invokes the same method on child components, causing O(2^n) work relative to nesting depth. Component.from_ical accepts arbitrarily nested BEGIN:VEVENT blocks without a depth limit, so an attacker can submit a sub-kilobyte .ics file containing equal nested subtrees and trigger the cost when an application performs equality, inequality, membership, deduplication, test-assertion, round-trip, or normalization comparisons. Parsing alone does not trigger the issue, and comparisons that differ early short-circuit, but a few hundred bytes can pin a CPU core for minutes or indefinitely, causing denial of service in calendar sync or import endpoints, invite processing, and other comparison paths. This issue is fixed in version 7.1.3.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 15:05 UTC
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/collective/icalendar/security/… | x_refsource_CONFIRM |
| https://github.com/collective/icalendar/commit/b6… | x_refsource_MISC |
| https://github.com/collective/icalendar/commit/ca… | x_refsource_MISC |
| https://github.com/collective/icalendar/releases/… | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2026/06/23/8 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| collective | icalendar |
Affected:
>= 7.1.0, < 7.1.3
|
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CVE-2026-77399 (GCVE-0-2026-77399)
Vulnerability from cvelistv5 – Published: 2026-09-22 18:58 – Updated: 2026-09-23 14:36
VLAI
EPSS
VEX
Title
icalendar: Denial of service via unbounded VALARM REPEAT expansion
Summary
icalendar is an RFC 5545 compatible parser and generator of iCalendar files for Python. From 6.1.0 until 7.2.2, vInt.from_ical accepts an attacker-controlled VALARM REPEAT value and applications that request alarm times can eagerly expand it without an application-level limit. Alarms.times and Alarms.active reach the unbounded expansion in versions starting with 6.1.0, while Alarm.triggers adds a second affected path starting with 7.0.0. Parsing alone does not trigger the issue, but accessing these properties can consume excessive CPU time and heap memory and terminate or stall a service. This issue is fixed in version 7.2.2.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 14:10 UTC
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/collective/icalendar/security/… | x_refsource_CONFIRM |
| https://github.com/collective/icalendar/pull/1571 | x_refsource_MISC |
| https://github.com/collective/icalendar/commit/15… | x_refsource_MISC |
| https://github.com/collective/icalendar/commit/cd… | x_refsource_MISC |
| https://github.com/collective/icalendar/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| collective | icalendar |
Affected:
>= 6.1.0, < 7.2.2
|
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CVE-2026-55099 (GCVE-0-2026-55099)
Vulnerability from cvelistv5 – Published: 2026-08-25 19:27 – Updated: 2026-08-26 15:05
VLAI
EPSS
VEX
Title
icalendar: Algorithmic Complexity in Equality
Summary
icalendar is an RFC 5545 compatible parser and generator of iCalendar files for Python. From 7.1.0 until 7.1.3, the Component equality method in src/icalendar/cal/component.py compares nested subcomponents with two membership loops, and each membership test invokes the same method on child components, causing O(2^n) work relative to nesting depth. Component.from_ical accepts arbitrarily nested BEGIN:VEVENT blocks without a depth limit, so an attacker can submit a sub-kilobyte .ics file containing equal nested subtrees and trigger the cost when an application performs equality, inequality, membership, deduplication, test-assertion, round-trip, or normalization comparisons. Parsing alone does not trigger the issue, and comparisons that differ early short-circuit, but a few hundred bytes can pin a CPU core for minutes or indefinitely, causing denial of service in calendar sync or import endpoints, invite processing, and other comparison paths. This issue is fixed in version 7.1.3.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 15:05 UTC
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/collective/icalendar/security/… | x_refsource_CONFIRM |
| https://github.com/collective/icalendar/commit/b6… | x_refsource_MISC |
| https://github.com/collective/icalendar/commit/ca… | x_refsource_MISC |
| https://github.com/collective/icalendar/releases/… | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2026/06/23/8 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| collective | icalendar |
Affected:
>= 7.1.0, < 7.1.3
|
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"descriptions": [
{
"lang": "en",
"value": "icalendar is an RFC 5545 compatible parser and generator of iCalendar files for Python. From 7.1.0 until 7.1.3, the Component equality method in src/icalendar/cal/component.py compares nested subcomponents with two membership loops, and each membership test invokes the same method on child components, causing O(2^n) work relative to nesting depth. Component.from_ical accepts arbitrarily nested BEGIN:VEVENT blocks without a depth limit, so an attacker can submit a sub-kilobyte .ics file containing equal nested subtrees and trigger the cost when an application performs equality, inequality, membership, deduplication, test-assertion, round-trip, or normalization comparisons. Parsing alone does not trigger the issue, and comparisons that differ early short-circuit, but a few hundred bytes can pin a CPU core for minutes or indefinitely, causing denial of service in calendar sync or import endpoints, invite processing, and other comparison paths. This issue is fixed in version 7.1.3."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-400",
"description": "CWE-400: Uncontrolled Resource Consumption",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-407",
"description": "CWE-407: Inefficient Algorithmic Complexity",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-25T19:27:02.236Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/collective/icalendar/security/advisories/GHSA-cv84-9p8j-fj68",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/collective/icalendar/security/advisories/GHSA-cv84-9p8j-fj68"
},
{
"name": "https://github.com/collective/icalendar/commit/b6b2608ae3af6de40695b4e40f71847485aa0b49",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/collective/icalendar/commit/b6b2608ae3af6de40695b4e40f71847485aa0b49"
},
{
"name": "https://github.com/collective/icalendar/commit/cad40cd112c93fd142ec12cc5b37445a849b8a79",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/collective/icalendar/commit/cad40cd112c93fd142ec12cc5b37445a849b8a79"
},
{
"name": "https://github.com/collective/icalendar/releases/tag/v7.1.3",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/collective/icalendar/releases/tag/v7.1.3"
}
],
"source": {
"advisory": "GHSA-cv84-9p8j-fj68",
"discovery": "UNKNOWN"
},
"title": "icalendar: Algorithmic Complexity in Equality"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-55099",
"datePublished": "2026-08-25T19:27:02.236Z",
"dateReserved": "2026-06-16T14:41:54.579Z",
"dateUpdated": "2026-08-26T15:05:26.062Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}