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CVE-2016-5826

21
FAUCET Score

CVE-2016-5826 is an out-of-bounds heap read vulnerability affecting libical versions 0.47 and 1.0, specifically within the parser_get_next_char function. This flaw allows remote attackers to trigger a denial of service by crafting malicious strings for the icalparser_parse_string function. Rated 7.5 HIGH on CVSS, it is network-exploitable with low attack complexity and no user interaction, leading to high availability impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
0.47CPE matchmatch criteria
cpe:2.3:a:libical_project:libical:0.47:*:*:*:*:*:*:*
1.0CPE matchmatch criteria
cpe:2.3:a:libical_project:libical:1.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.04%
Probability of exploitation in next 30 days
EPSS Percentile
86.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0304 is in the 75th percentile among its peer group of 51,466 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (4)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: thunderbird
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libical
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: thunderbird
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: thunderbird

Vendor Advisories (1)

redhatCVE-2016-5826Low

libical: Heap buffer over-read in parser_get_next_char

Jun 25, 2016

References

bugzilla.mozilla.org / show_bug.cgi
Issue Tracking
openwall.com / lists/oss-security/2016/06/25/4
Mailing ListThird Party Advisory
securityfocus.com / bid/91459
Third Party AdvisoryVDB Entry