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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.

PUBLISHED Reserved 2026-02-20 | Published 2026-02-22 | Updated 2026-02-22 | Assigner VulDB




MEDIUM: 4.8CVSS: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
LOW: 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
LOW: 3.3CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
1.7AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C

Problem types

NULL Pointer Dereference

Denial of Service

Product status

4.0
affected

4.1
affected

4.2
affected

4.3
affected

4.4
affected

Timeline

2026-02-20:Advisory disclosed
2026-02-20:VulDB entry created
2026-02-20:VulDB entry last update

Credits

Oneafter (VulDB User) reporter

References

vuldb.com/?id.347210 (VDB-347210 | skvadrik re2c ast.cc check_and_merge_special_rules null pointer dereference) vdb-entry technical-description

vuldb.com/?ctiid.347210 (VDB-347210 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.755030 (Submit #755030 | skvadrik re2c 04f1424 NULL Pointer Dereference) third-party-advisory

github.com/skvadrik/re2c/issues/571 issue-tracking

github.com/skvadrik/re2c/issues/571 issue-tracking

github.com/oneafter/0202/blob/main/re/repro exploit

github.com/...ommit/febeb977936f9519a25d9fbd10ff8256358cdb97 patch

github.com/skvadrik/re2c/ product

cve.org (CVE-2026-2903)

nvd.nist.gov (CVE-2026-2903)

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