A flaw has been found in skvadrik re2c up to 4.4. Impacted is the function check_and_merge_special_rules of the file src/parse/ast.cc. This manipulation causes null pointer dereference. The attack can only be executed locally. The exploit has been published and may be used. Patch name: febeb977936f9519a25d9fbd10ff8256358cdb97. It is suggested to install a patch to address this issue.

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Access Vector Local

Access Complexity Low

Authentication Single

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
skvadrik re2c affected
Version Status Constraints
4.0 affected —
4.1 affected —
4.2 affected —
4.3 affected —
4.4 affected —

No data.

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Project Subscriptions

Vendors Products
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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/oneafter/0202/blob/main/re/repro cve-icon cve-icon
https://github.com/skvadrik/re2c/ cve-icon cve-icon
https://github.com/skvadrik/re2c/commit/febeb977936f9519a25d9fbd10ff8256358cdb97 cve-icon cve-icon
https://github.com/skvadrik/re2c/issues/571 cve-icon cve-icon
https://github.com/skvadrik/re2c/issues/571#issuecomment-3837675101 cve-icon cve-icon
https://vuldb.com/?ctiid.347210 cve-icon cve-icon
https://vuldb.com/?id.347210 cve-icon cve-icon
https://vuldb.com/?submit.755030 cve-icon cve-icon
History

Sun, 22 Feb 2026 01:00:00 +0000

Type Values Removed Values Added
Description A flaw has been found in skvadrik re2c up to 4.4. Impacted is the function check_and_merge_special_rules of the file src/parse/ast.cc. This manipulation causes null pointer dereference. The attack can only be executed locally. The exploit has been published and may be used. Patch name: febeb977936f9519a25d9fbd10ff8256358cdb97. It is suggested to install a patch to address this issue.
Title skvadrik re2c ast.cc check_and_merge_special_rules null pointer dereference
First Time appeared Re2c
Re2c re2c
Weaknesses CWE-404
CWE-476
CPEs cpe:2.3:a:re2c:re2c:*:*:*:*:*:*:*:*
Vendors & Products Re2c
Re2c re2c
References
Metrics cvssV2_0

{'score': 1.7, 'vector': 'AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C'}

cvssV3_0

{'score': 3.3, 'vector': 'CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C'}

cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C'}

cvssV4_0

{'score': 4.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-02-22T00:32:09.412Z

Reserved: 2026-02-20T20:02:38.891Z

Link: CVE-2026-2903

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-02-22T01:16:00.563

Modified: 2026-02-22T01:16:00.563

Link: CVE-2026-2903

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses