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CVE-2016-9954

26
FAUCET Score

CVE-2016-9954 describes a denial-of-service vulnerability in the Irregex package (IrRegular Expressions) for Scheme, affecting versions prior to 0.9.6. This flaw allows remote attackers to consume excessive memory by submitting a specially crafted regular expression containing a repeating pattern. Rated 7.5 HIGH, this vulnerability can be exploited remotely with low attack complexity and no user interaction, leading to high availability impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.9.5CPE matchmatch criteria
cpe:2.3:a:irregex_project:irregex:*:*:*:*:*:*:*:*

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
2.40%
Probability of exploitation in next 30 days
EPSS Percentile
82.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0240 is in the 68th percentile among its peer group of 51,485 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

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party AdvisoryVDB Entry
github.com / ashinn/irregex/commit/a16ffc86eca15fca9e40607d41de3cea9cf868f1
PatchThird Party Advisory
openwall.com / lists/oss-security/2016/12/15/8
Mailing ListThird Party Advisory
securityfocus.com / bid/94942
Third Party AdvisoryVDB Entry