In YARA 3.8.1, bytecode in a specially crafted compiled rule can read uninitialized data from VM scratch memory in libyara/exec.c
Published Dec 17, 2018
5.5
MEDIUMCVSS 3.0
EPSS 1.26%
Description
In YARA 3.8.1, bytecode in a specially crafted compiled rule can read uninitialized data from VM scratch memory in libyara/exec.c. This can allow attackers to discover addresses in the real stack (not the YARA virtual stack).
Affected products
No data.
- 3.8.1
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
AV:N/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.26% (0.01265) | 68.66th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.26% (0.01265) | 68.42th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.12% (0.00117) | 46.03th | v3 (v2023.03.01) |
| Dec 11, 2023 | 0.12% (0.00117) | 45.31th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.11% (0.00111) | 42.53th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.02% (0.01018) | 19.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.04% (0.01040) | 28.32th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.04% (0.01040) | 0.00th | v1 |
References (4)
- https://bnbdr.github.io/posts/extracheese/ x_refsource_MISCExploitThird Party Advisory
- https://github.com/VirusTotal/yara/issues/999 x_refsource_CONFIRMExploitIssue TrackingThird Party Advisory
- https://github.com/bnbdr/swisscheese/ x_refsource_MISCExploitThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DFFXDAMP6GJ337LIOTVF5I4T6QGMN3ZR/ vendor-advisoryx_refsource_FEDORA
| Link | Providers | Tags |
|---|---|---|
| https://bnbdr.github.io/posts/extracheese/ | x_refsource_MISCExploitThird Party Advisory | |
| https://github.com/VirusTotal/yara/issues/999 | x_refsource_CONFIRMExploitIssue TrackingThird Party Advisory | |
| https://github.com/bnbdr/swisscheese/ | x_refsource_MISCExploitThird Party Advisory | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DFFXDAMP6GJ337LIOTVF5I4T6QGMN3ZR/ | vendor-advisoryx_refsource_FEDORA |
Change history (0)
No recorded changes yet.