CVE-2020-15945
Lua through 5.4.0 has a segmentation fault in changedline in ldebug.c (e.g., when called by...
Lua 5.4.0 (fixed in 5.4.1) has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Lua 5.4.0 (fixed in 5.4.1) has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.
- Record
CVE-2020-15945- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 2.1 Low
AV:L/AC:L/Au:N/C:N/I:N/A:P - Updated
- 2026-11-02
CVE List No score
Lua 5.4.0 (fixed in 5.4.1) has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.
- Record
CVE-2020-15945- Updated
- 2026-11-02
EUVDEUVD-2020-7916
Lua 5.4.0 (fixed in 5.4.1) has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.
- Record
EUVD-2020-7916- CVSS
- 0.0 None
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-4fp8-99qh-27p3
Lua through 5.4.0 has a segmentation fault in changedline in ldebug.c (e.g., when called by...
Lua through 5.4.0 has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.
- Record
GHSA-4fp8-99qh-27p3- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVAZL-40818
CVE-2020-15945 affecting package lua for versions less than 5.4.0-1
Lua 5.4.0 (fixed in 5.4.1) has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.
- Record
AZL-40818- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-05
OSVAZL-6671
CVE-2020-15945 affecting package lua for versions less than 5.4.3-1
Lua 5.4.0 (fixed in 5.4.1) has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.
- Record
AZL-6671- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
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OSV
Lua 5.4.0 (fixed in 5.4.1) has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.
- Record
CVE-2020-15945- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2020-15945
Lua 5.4.0 (fixed in 5.4.1) has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.
- Record
DEBIAN-CVE-2020-15945- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVJLSEC-2026-554
Lua 5.4.0 (fixed in 5.4.1) has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.
- Record
JLSEC-2026-554- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 2.1 Low
AV:L/AC:L/Au:N/C:N/I:N/A:P - Updated
- 2026-11-02
OSVBIT-lua-2020-15945 No score
Lua 5.4.0 (fixed in 5.4.1) has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.
- Record
BIT-lua-2020-15945- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:11029-1 No score
liblua5_4-5-32bit-5.4.3-4.2 on GA media
These are all security issues fixed in the liblua5_4-5-32bit-5.4.3-4.2 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:11029-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2025:15401-1 No score
liblua5_5-5-5.5.0~beta1-1.1 on GA media
These are all security issues fixed in the liblua5_5-5-5.5.0~beta1-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2025:15401-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
luaAzure Linux:3 |
before 5.4.0-1 | 5.4.0-1 |
luaAzure Linux:2 |
before 5.4.3-1 | 5.4.3-1 |
luaBitnami |
5.3.1 up to 5.4.0 | 5.4.0 |
lua5.4Debian:12 |
before 5.4.1-1 | 5.4.1-1 |
lua5.4Debian:13 |
before 5.4.1-1 | 5.4.1-1 |
lua5.4Debian:14 |
before 5.4.1-1 | 5.4.1-1 |
Lua_jllJulia |
before 5.4.3+0 | 5.4.3+0 |
lua55openSUSE:Tumbleweed From an advisory covering 9 CVEs |
before 5.5.0~beta1-1.1 | 5.5.0~beta1-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| facts | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-15945 is a medium vulnerability (CVSS 5.5) in Lua, published July 24, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.55%, the 45th percentile. Fixed in lua 5.4.0-1.
References
lua-users.org/lists/lua-l/2020-07/msg00123.html
github.com/lua/lua/commit/a2195644d89812e5b157ce7bac35543e06db05e3
lua.org/bugs.html
nvd.nist.gov/vuln/detail/CVE-2020-15945
security-tracker.debian.org/tracker/CVE-2020-15945
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suse.com/security/cve/CVE-2020-15888