How severe is CVE-2016-5826?

CVE-2016-5826 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2016-5826 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-5826?

CVE-2016-5826 primarily affects Libical Project Libical. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-5826?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-5826 published?

CVE-2016-5826 was published on 2017-01-27 and last updated on 2026-06-17.

CVE-2016-5826

CVE-2016-5826 is a high-severity vulnerability in Libical Project Libical with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Libical Project Libical
Published: 2017-01-27
Last modified: 2026-06-17

Description

The parser_get_next_char function in libical 0.47 and 1.0 allows remote attackers to cause a denial of service (out-of-bounds heap read) by crafting a string to the icalparser_parse_string function.

Frequently asked questions

What is CVE-2016-5826?: The parser_get_next_char function in libical 0.47 and 1.0 allows remote attackers to cause a denial of service (out-of-bounds heap read) by crafting a string to the icalparser_parse_string function.
How severe is CVE-2016-5826?: CVE-2016-5826 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2016-5826 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-5826?: CVE-2016-5826 primarily affects Libical Project Libical. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-5826?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-5826 published?: CVE-2016-5826 was published on 2017-01-27 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:libical_project:libical:0.47:*:*:*:*:*:*:*
cpe:2.3:a:libical_project:libical:1.0:*:*:*:*:*:*:*

More vulnerabilities in Libical Project Libical

CVE-2016-9584 — Critical (CVSS 9.1): libical allows remote attackers to cause a denial of service (use-after-free) and possibly read heap memory via a…
CVE-2016-5827 — High (CVSS 7.5): The icaltime_from_string function in libical 0.47 and 1.0 allows remote attackers to cause a denial of service…
CVE-2016-5825 — Medium (CVSS 5.5): The icalparser_parse_string function in libical 0.47 and 1.0 allows remote attackers to cause a denial of service…
CVE-2016-5824 — Medium (CVSS 5.5): libical 1.0 allows remote attackers to cause a denial of service (use-after-free) via a crafted ics file.
CVE-2016-5823 — Medium (CVSS 5.5): The icalproperty_new_clone function in libical 0.47 and 1.0 allows remote attackers to cause a denial of service…

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Other CWE-125 (Out-of-bounds Read) vulnerabilities

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CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

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