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NVD / CVE Program· CNA mitre

CVE-2019-20387: repodata_schema2id in repodata.c in libsolv before 0.7.6 has a heap-based buffer over-read via a last schema whose length is less than the l

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.3% (FIRST EPSS); higher than 83.5% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: libsolv (Debian:12) 0.6.36-2; libsolv (Debian:8) 0.6.5-1+deb8u1; libsolv (Red Hat:enterprise_linux:8::baseos) 0:0.7.11-1.el8.

Low priority for now. Upgrade to libsolv (Debian:12) 0.6.36-2; libsolv (Debian:8) 0.6.5-1+deb8u1; libsolv (Red Hat:enterprise_linux:8::baseos) 0:0.7.11-1.el8 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

repodata_schema2id in repodata.c in libsolv before 0.7.6 has a heap-based buffer over-read via a last schema whose length is less than the length of the input schema.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Jan 21, 2020
Updated
Jun 16, 2026
EPSS
2.3% · 83th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.3%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
opensuselibsolv
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux8.0
  • opensuse libsolvbefore 0.7.6

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12libsolvbefore 0.6.36-20.6.36-2
Debian:8libsolvbefore 0.6.5-1+deb8u10.6.5-1+deb8u1
Red Hat:enterprise_linux:8::baseoslibsolvbefore 0:0.7.11-1.el80:0.7.11-1.el8
Red Hat:enterprise_linux:8::baseoslibsolv-debuginfobefore 0:0.7.11-1.el80:0.7.11-1.el8
Red Hat:enterprise_linux:8::baseoslibsolv-debugsourcebefore 0:0.7.11-1.el80:0.7.11-1.el8
Red Hat:enterprise_linux:8::baseoslibsolv-demo-debuginfobefore 0:0.7.11-1.el80:0.7.11-1.el8
Red Hat:enterprise_linux:8::baseoslibsolv-tools-debuginfobefore 0:0.7.11-1.el80:0.7.11-1.el8
Red Hat:enterprise_linux:8::baseosperl-solv-debuginfobefore 0:0.7.11-1.el80:0.7.11-1.el8
Red Hat:enterprise_linux:8::baseospython3-solvbefore 0:0.7.11-1.el80:0.7.11-1.el8
Red Hat:enterprise_linux:8::baseospython3-solv-debuginfobefore 0:0.7.11-1.el80:0.7.11-1.el8
Red Hat:enterprise_linux:8::baseosruby-solv-debuginfobefore 0:0.7.11-1.el80:0.7.11-1.el8
SUSE:HPE Helion OpenStack 8libsolvbefore 0.6.37-2.33.10.6.37-2.33.1
SUSE:HPE Helion OpenStack 8libzyppbefore 16.21.4-2.51.116.21.4-2.51.1
SUSE:Linux Enterprise Server 12 SP2-BCLlibsolvbefore 0.6.37-2.27.24.10.6.37-2.27.24.1
SUSE:Linux Enterprise Server 12 SP2-BCLlibzyppbefore 16.21.4-27.75.116.21.4-27.75.1

Same product

opensuse: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-48864Libsolv: heap buffer overflow in libsolv repopagestore via unchecked decompression of malicious .solv page data
    31Monitor
  • CVE-2026-48863Libsolv: stack-based buffer overflow in libsolv eddsa pgp signature verification allows denial of service
    30Monitor
  • CVE-2021-33938Buffer overflow vulnerability in function prune_to_recommended in src/policy.c in libsolv before 0.7.17 allows attackers to cause a Denial o
    30Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2018-20533Dec 28, 2018 · There is a NULL pointer dereference at ext/testcase.c (function testcase_str2dep_complex) in libsolvext.a in libsolv through 0.7.2 that will
    27Monitor
  • ← EarlierCVE-2018-20534Dec 28, 2018 · There is an illegal address access at ext/testcase.c in libsolv.a in libsolv through 0.7.2 that will cause a denial of service.
    27Monitor
  • Later →CVE-2021-3200May 18, 2021 · Buffer overflow vulnerability in libsolv 2020-12-13 via the Solver * testcase_read(Pool *pool, FILE *fp, const char *testcase, Queue *job, c
    13Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:libsolv0.6.36-2 · Debian:12Package registry (OSV)
red hat:libsolv0:0.7.11-1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:libsolv-debuginfo0:0.7.11-1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:libsolv-debugsource0:0.7.11-1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:libsolv-demo-debuginfo0:0.7.11-1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:libsolv-tools-debuginfo0:0.7.11-1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:perl-solv-debuginfo0:0.7.11-1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:python3-solv0:0.7.11-1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:python3-solv-debuginfo0:0.7.11-1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:ruby-solv-debuginfo0:0.7.11-1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
suse:libsolv0.6.37-2.27.24.1 · SUSE:Linux Enterprise Server 12 SP2-BCLPackage registry (OSV)
suse:libzypp16.21.4-27.75.1 · SUSE:Linux Enterprise Server 12 SP2-BCLPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records